Pub Date : 2024-11-21DOI: 10.1016/j.matchemphys.2024.130167
Shaofeng Zong , Cong Qin , Hari Bala , Yan Zhang , Yan Wang , Jianliang Cao
Heterojunction composite structures engineered with homo-metallic elements are an effective strategy for boosting gas sensing capabilities due to their ability to effectively reduce the contact barrier for charge transfer. In this study, iso-elemental SnO/SnO2 micro-rod composites were fabricated through hydrothermal synthesis followed by calcination. The gas sensing performance revealed that SnO/SnO2 microstructure when calcined at 400 °C (referred to as M1-400), displays remarkable long-term stability, with a response value of 21.05 and the quickest recovery time of 38 s–100 ppm of formaldehyde (HCHO) at 320 °C, outperforming other sensors. Further investigation indicates that the enhanced sensitivity of M1-400 can be attributed to the p-n heterojunction of SnO–SnO2 facilitating electron transport, and its increased adsorption affinity for HCHO due to higher vacuum and oxygen content. This synthesis strategy for SnO/SnO2 suggests that this material is promising for HCHO gas sensing applications and could offer a potentially straightforward method for preparing one-dimensional metal oxides.
{"title":"Iso-elemental SnO/SnO2 heterojunction composites for enhanced formaldehyde gas sensing","authors":"Shaofeng Zong , Cong Qin , Hari Bala , Yan Zhang , Yan Wang , Jianliang Cao","doi":"10.1016/j.matchemphys.2024.130167","DOIUrl":"10.1016/j.matchemphys.2024.130167","url":null,"abstract":"<div><div>Heterojunction composite structures engineered with homo-metallic elements are an effective strategy for boosting gas sensing capabilities due to their ability to effectively reduce the contact barrier for charge transfer. In this study, iso-elemental SnO/SnO<sub>2</sub> micro-rod composites were fabricated through hydrothermal synthesis followed by calcination. The gas sensing performance revealed that SnO/SnO<sub>2</sub> microstructure when calcined at 400 °C (referred to as M1-400), displays remarkable long-term stability, with a response value of 21.05 and the quickest recovery time of 38 s–100 ppm of formaldehyde (HCHO) at 320 °C, outperforming other sensors. Further investigation indicates that the enhanced sensitivity of M1-400 can be attributed to the p-n heterojunction of SnO–SnO<sub>2</sub> facilitating electron transport, and its increased adsorption affinity for HCHO due to higher vacuum and oxygen content. This synthesis strategy for SnO/SnO<sub>2</sub> suggests that this material is promising for HCHO gas sensing applications and could offer a potentially straightforward method for preparing one-dimensional metal oxides.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"330 ","pages":"Article 130167"},"PeriodicalIF":4.3,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Ca-rich and Sr-rich stoichiometric and non-stoichiometric materials were obtained by the modified citrate method. After calcination at 900 °C, materials were characterized in terms of structure, microstructure and reducibility in an H2-containing atmosphere. The diffractometric data did not confirm the presence of Co-originated phases. Co K-edge and Ti K-edge were recorded and analyzed for a deeper description of the structural properties of materials, mainly the influence of non-stoichiometry on the effectiveness of Co incorporation into the perovskite systems. The X-ray absorption near edge structure study combined with temperature programmed reduction results indicated the presence of CoTiO3 and cobalt oxides phases for Ca-rich and Sr-rich. This approach also allowed to observe that non-stoichiometry in Sr-rich materials results in a lower amount of cobalt incorporated into the perovskite structure and a higher amount of Co3O4 formed. Additionally, for Ca-rich materials, XANES spectra indicated a higher amount of Co in the Ti sublattice and confirmed the higher Co2+/Co3+ ratio than in the case of Sr-rich materials.
通过改良柠檬酸盐法获得了富含钙和锶的化学计量材料和非化学计量材料。在 900 °C 煅烧后，在含 H2- 的气氛中对材料的结构、微观结构和还原性进行了表征。衍射数据并未证实共生相的存在。对 Co K-edge 和 Ti K-edge 进行了记录和分析，以便更深入地描述材料的结构特性，主要是非化学计量对包晶系统中 Co 掺杂效果的影响。X 射线吸收近边缘结构研究结合温度编程还原结果表明，富含 Ca 和富含 Sr 的材料中存在 CoTiO3 和钴氧化物相。通过这种方法还可以观察到，富硒材料中的非化学计量导致包晶结构中的钴含量较低，而形成的 Co3O4 含量较高。此外，与富含 Sr 的材料相比，富含 Ca 的材料的 XANES 光谱显示 Ti 亚晶格中的钴含量更高，并证实 Co2+/Co3+ 的比例更高。
{"title":"Unravelling cobalt incorporation in Ca- and Sr-rich perovskites: How symmetry shapes the phases","authors":"Paulina Gwóźdź , Alexey Maximenko , Agnieszka Łącz , Ewa Drożdż","doi":"10.1016/j.matchemphys.2024.130180","DOIUrl":"10.1016/j.matchemphys.2024.130180","url":null,"abstract":"<div><div>The Ca-rich and Sr-rich stoichiometric and non-stoichiometric materials were obtained by the modified citrate method. After calcination at 900 °C, materials were characterized in terms of structure, microstructure and reducibility in an H<sub>2</sub>-containing atmosphere. The diffractometric data did not confirm the presence of Co-originated phases. Co K-edge and Ti K-edge were recorded and analyzed for a deeper description of the structural properties of materials, mainly the influence of non-stoichiometry on the effectiveness of Co incorporation into the perovskite systems. The X-ray absorption near edge structure study combined with temperature programmed reduction results indicated the presence of CoTiO<sub>3</sub> and cobalt oxides phases for Ca-rich and Sr-rich. This approach also allowed to observe that non-stoichiometry in Sr-rich materials results in a lower amount of cobalt incorporated into the perovskite structure and a higher amount of Co<sub>3</sub>O<sub>4</sub> formed. Additionally, for Ca-rich materials, XANES spectra indicated a higher amount of Co in the Ti sublattice and confirmed the higher Co<sup>2+</sup>/Co<sup>3+</sup> ratio than in the case of Sr-rich materials.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130180"},"PeriodicalIF":4.3,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-20DOI: 10.1016/j.matchemphys.2024.130168
Wentao Yang , Xiliang Yan , Yuanchao Li
Graphene (PG) and graphene-like (BN, BC3, NC3 and SiC3) nanomaterials have received widespread attention in the fields of drug delivery and biosensing with encouraging results. However, the origin and differences of their outstanding performance are not yet clear. Herein, the electronic, reactivity and optical properties of favipiravir (FPV) on the PG, BN and XC3 (X = B, N, Si) were carefully studied and discussed from a theoretical perspective. The analysis of the adsorption energy indicates that the B, N and Si atoms of graphene-like nanosheets are more reactive toward the FPV molecule. ELF, IGMH and QTAIM analysis further demonstrate that there are non-covalent interactions for all adsorption systems, except for NC3/FPV complex, which contains fewer partially covalent characters. Moreover, the adsorption energy of protonated NC3/FPV complex decreases, which is beneficial for the release of the FPV drug to the target site. Interestingly, NC3 also exhibits the ideal recovery time and sensing response to FPV drug. These results suggest that NC3 may act as superior biosensor material and drug delivery candidate for FPV drug. By comparing the delivery and sensing properties, this research offers new insights into promoting the application of graphene-like materials in the medical engineering.
{"title":"Comparison of delivery and sensing properties of graphene and graphene-like nanomaterials for favipiravir","authors":"Wentao Yang , Xiliang Yan , Yuanchao Li","doi":"10.1016/j.matchemphys.2024.130168","DOIUrl":"10.1016/j.matchemphys.2024.130168","url":null,"abstract":"<div><div>Graphene (PG) and graphene-like (BN, BC<sub>3</sub>, NC<sub>3</sub> and SiC<sub>3</sub>) nanomaterials have received widespread attention in the fields of drug delivery and biosensing with encouraging results. However, the origin and differences of their outstanding performance are not yet clear. Herein, the electronic, reactivity and optical properties of favipiravir (FPV) on the PG, BN and XC<sub>3</sub> (X = B, N, Si) were carefully studied and discussed from a theoretical perspective. The analysis of the adsorption energy indicates that the B, N and Si atoms of graphene-like nanosheets are more reactive toward the FPV molecule. ELF, IGMH and QTAIM analysis further demonstrate that there are non-covalent interactions for all adsorption systems, except for NC<sub>3</sub>/FPV complex, which contains fewer partially covalent characters. Moreover, the adsorption energy of protonated NC<sub>3</sub>/FPV complex decreases, which is beneficial for the release of the FPV drug to the target site. Interestingly, NC<sub>3</sub> also exhibits the ideal recovery time and sensing response to FPV drug. These results suggest that NC<sub>3</sub> may act as superior biosensor material and drug delivery candidate for FPV drug. By comparing the delivery and sensing properties, this research offers new insights into promoting the application of graphene-like materials in the medical engineering.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130168"},"PeriodicalIF":4.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-20DOI: 10.1016/j.matchemphys.2024.130176
Faisal Ali , Hafiz Muhammad Yasir , Umer Younas , Aimon Saleem , Ejaz Hussain , Osama A. Mohammed , Munawar Iqbal , Faiza Imtiaz , Mustafa Ahmed Abdel-Reheim , Muhammad Pervaiz
Nanoparticles are being used for diverse environmental as well as biomedical applications due to their versatile features. In current work, a facile green synthesis route was employed for the fabrication of Cu–ZnO@ZrO2 nano-needles (NNs) using Momordica charantia (MC) stem extract and ZrO2 was used as a precursor along with CuCl2 and ZnCl2. UV–Vis and FTIR analysis confirmed the formation of Cu–ZnO@ZrO2 NNs. XRD studies confirmed orthorhombic geometry and FE-SEM images confirmed needle like structure of the prepared Cu–ZnO@ZrO2. Catalytic potential of the synthesized NNs was evaluated in terms of its efficiency towards degradation of rhodamine-B (Rh–B) dye. Degradation was achieved up to 98 % in 14 min in the presence of NNs. Conditions were optimized for the maximum removal of the dye using ascorbic acid (AA) as a reducing agent. Synthesized NNs sample was tested against another toxic pollutant i.e. Cr (VI) that was removed up to 65 % from aqueous medium. Promising antibacterial activity of the NNs was recorded against gram-positive and gram-negative bacterial strains. The results of the current study revealed promising features of NNs suggesting its use for the removal of microorganisms, organic and metallic pollutants. Authors would strongly suggest the fabrication of nanocomposites of same composition for the treatment of toxic pollutants in aqueous medium.
{"title":"Rhodamine-B degradation, chromium removal and bactericidal potential of Cu–ZnO@ZrO2 nanoneedles fabricated via green route","authors":"Faisal Ali , Hafiz Muhammad Yasir , Umer Younas , Aimon Saleem , Ejaz Hussain , Osama A. Mohammed , Munawar Iqbal , Faiza Imtiaz , Mustafa Ahmed Abdel-Reheim , Muhammad Pervaiz","doi":"10.1016/j.matchemphys.2024.130176","DOIUrl":"10.1016/j.matchemphys.2024.130176","url":null,"abstract":"<div><div>Nanoparticles are being used for diverse environmental as well as biomedical applications due to their versatile features. In current work, a facile green synthesis route was employed for the fabrication of Cu–ZnO@ZrO<sub>2</sub> nano-needles (NNs) using <em>Momordica charantia</em> (<em>MC</em>) stem extract and ZrO<sub>2</sub> was used as a precursor along with CuCl<sub>2</sub> and ZnCl<sub>2</sub>. UV–Vis and FTIR analysis confirmed the formation of Cu–ZnO@ZrO<sub>2</sub> NNs. XRD studies confirmed orthorhombic geometry and FE-SEM images confirmed needle like structure of the prepared Cu–ZnO@ZrO<sub>2</sub>. Catalytic potential of the synthesized NNs was evaluated in terms of its efficiency towards degradation of rhodamine-B (Rh–B) dye. Degradation was achieved up to 98 % in 14 min in the presence of NNs. Conditions were optimized for the maximum removal of the dye using ascorbic acid (AA) as a reducing agent. Synthesized NNs sample was tested against another toxic pollutant <em>i.e.</em> Cr (VI) that was removed up to 65 % from aqueous medium. Promising antibacterial activity of the NNs was recorded against gram-positive and gram-negative bacterial strains. The results of the current study revealed promising features of NNs suggesting its use for the removal of microorganisms, organic and metallic pollutants. Authors would strongly suggest the fabrication of nanocomposites of same composition for the treatment of toxic pollutants in aqueous medium.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"332 ","pages":"Article 130176"},"PeriodicalIF":4.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-20DOI: 10.1016/j.matchemphys.2024.130173
Yazdan Firouzi jahantigh , Mehdi Mehrpooya , Reza Askari Moghadam , Mohammad Reza Ganjali
A MEMS systems integrate mechanical components, sensors, actuators, and electronics on the same silicon substrate using microfabrication technology. Micromechanical parts are made by micromachining processes that selectively etch part of the silicon substrate or deposit layers of a new structure. In this work, these structures and their building blocks are presented, and a nano-network of metal-organic compounds is reported for the synthesis and recognition of glucose. The morphological structure of the prepared sample was observed through scanning electron microscopy. At the same time, the structure and characteristics of the metal-organic framework crystals were examined using scanning electron microscopy mapping and analysis tests like energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, Raman spectroscopy, and infrared spectroscopy. This prepared material was inserted into a microstructure and evaluated as a glucose sensor. This all leads to the final microstructure that arises from the integration of the microscale technology with the electrochemical sensing systems. Both the electrochemical structure and the microscale chip are integrated to achieve the final structure, which includes microchannels and a three-electrode system comprising a reference electrode, a counter electrode, and a working electrode for the reaction and detection of glucose levels. Finally, the microscale chip, made from polycarbonate sheets, is placed on the three-electrode system, secured, and the design and construction of this microscale sensor enable the measurement of various glucose concentrations. Glucose sensing was performed using cyclic voltammetry and chronoamperometry processes by directing glucose-containing fluid through the structural channels toward the electrodes. The best electrocatalytic behavior towards glucose oxidation in 0.1 M potassium hydroxide environments was attained. During these processes, a high sensitivity of 35,000 μA per millimolar square centimeter in the linear range of 0–6 μM with a very low detection limit of 0.18 μM and a correlation coefficient of 0.998 (R2) was obtained.
微机电系统利用微加工技术将机械部件、传感器、致动器和电子器件集成在同一硅基板上。微机械零件是通过微加工工艺制造的，这种工艺选择性地蚀刻硅基板的一部分或沉积一层新的结构。在这项工作中，介绍了这些结构及其构件，并报告了一种用于合成和识别葡萄糖的金属有机化合物纳米网络。通过扫描电子显微镜观察了制备样品的形态结构。同时，利用扫描电子显微镜绘图和能量色散 X 射线光谱、X 射线衍射分析、拉曼光谱和红外光谱等分析测试，研究了金属有机框架晶体的结构和特性。将制备好的材料插入微结构中，并作为葡萄糖传感器进行评估。这一切都导致了微米级技术与电化学传感系统集成所产生的最终微结构。电化学结构和微尺度芯片经过整合后形成最终结构，其中包括微通道和三电极系统，三电极系统由参比电极、对电极和工作电极组成，用于葡萄糖水平的反应和检测。最后，将聚碳酸酯片制成的微型芯片放置在三电极系统上并固定好，这种微型传感器的设计和构造使其能够测量各种浓度的葡萄糖。利用循环伏安法和时变测量法，将含葡萄糖的液体通过结构通道引向电极，从而实现葡萄糖传感。在 0.1 M 氢氧化钾环境中，葡萄糖氧化的电催化性能最佳。在这些过程中，在 0-6 μM 的线性范围内，灵敏度高达每毫摩尔平方厘米 35,000 μA，检出限极低，仅为 0.18 μM，相关系数为 0.998 (R2)。
{"title":"Design and fabrication of glucose sensor using metal-organic framework nanomaterials","authors":"Yazdan Firouzi jahantigh , Mehdi Mehrpooya , Reza Askari Moghadam , Mohammad Reza Ganjali","doi":"10.1016/j.matchemphys.2024.130173","DOIUrl":"10.1016/j.matchemphys.2024.130173","url":null,"abstract":"<div><div>A MEMS systems integrate mechanical components, sensors, actuators, and electronics on the same silicon substrate using microfabrication technology. Micromechanical parts are made by micromachining processes that selectively etch part of the silicon substrate or deposit layers of a new structure. In this work, these structures and their building blocks are presented, and a nano-network of metal-organic compounds is reported for the synthesis and recognition of glucose. The morphological structure of the prepared sample was observed through scanning electron microscopy. At the same time, the structure and characteristics of the metal-organic framework crystals were examined using scanning electron microscopy mapping and analysis tests like energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, Raman spectroscopy, and infrared spectroscopy. This prepared material was inserted into a microstructure and evaluated as a glucose sensor. This all leads to the final microstructure that arises from the integration of the microscale technology with the electrochemical sensing systems. Both the electrochemical structure and the microscale chip are integrated to achieve the final structure, which includes microchannels and a three-electrode system comprising a reference electrode, a counter electrode, and a working electrode for the reaction and detection of glucose levels. Finally, the microscale chip, made from polycarbonate sheets, is placed on the three-electrode system, secured, and the design and construction of this microscale sensor enable the measurement of various glucose concentrations. Glucose sensing was performed using cyclic voltammetry and chronoamperometry processes by directing glucose-containing fluid through the structural channels toward the electrodes. The best electrocatalytic behavior towards glucose oxidation in 0.1 M potassium hydroxide environments was attained. During these processes, a high sensitivity of 35,000 μA per millimolar square centimeter in the linear range of 0–6 μM with a very low detection limit of 0.18 μM and a correlation coefficient of 0.998 (R<sup>2</sup>) was obtained.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130173"},"PeriodicalIF":4.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-20DOI: 10.1016/j.matchemphys.2024.130177
Zulhadjri, Alfir Rizki, Tio Putra Wendari, Yulia Eka Putri
Layered bismuth ferroelectrics such as SrBi2Nb2O9 (SBN) are recognized for their potential in advanced ferroelectric technologies. This study involves enhancing the dielectric characteristics of SBN through Nd3+ doping, leading to the development of SrBi2-xNdxNb2O9. These compound were synthesized across a series of compositions (x = 0.025, 0.05, 0.075, 0.1, 0.125, 0.25, and 0.275) via the molten salt method. X-ray diffraction (XRD) confirmed that all the samples retained an orthorhombic lattice structure in the A21am space group. This demonstrated decreased in cell volume and orthorhombicity as Nd3+ concentration increased. Scanning electron microscopy (SEM) with particle size distribution histogram revealed a progressive reduction in grain size, forming smaller, plate-like structures with higher levels of Nd3+. The alteration in Nd3+ concentration significantly lowered the ferroelectric transition temperature (Tc) and dielectric constant, primarily due to the reduced effect of Bi3+ ions 6s2 lone pairs on structural distortion. The compound with x = 0.275 demonstrated a diffuse ferroelectric transition, marked by an expanded Tc peak, illustrating the profound impact of Nd3+ doping on SBN dielectric and ferroelectric properties. This study investigates the effects of Nd3+ doping on the structural and dielectric properties of SBN, with implications for its potential use in ferroelectric applications such as FeRAM (Ferroelectric Random Access Memory).
{"title":"Structural and ferroelectric modifications in SrBi2Nb2O9 Aurivillius phase compounds by Nd3+ ion doping","authors":"Zulhadjri, Alfir Rizki, Tio Putra Wendari, Yulia Eka Putri","doi":"10.1016/j.matchemphys.2024.130177","DOIUrl":"10.1016/j.matchemphys.2024.130177","url":null,"abstract":"<div><div>Layered bismuth ferroelectrics such as SrBi<sub>2</sub>Nb<sub>2</sub>O<sub>9</sub> (SBN) are recognized for their potential in advanced ferroelectric technologies. This study involves enhancing the dielectric characteristics of SBN through Nd<sup>3+</sup> doping, leading to the development of SrBi<sub>2-x</sub>Nd<sub><em>x</em></sub>Nb<sub>2</sub>O<sub>9</sub>. These compound were synthesized across a series of compositions (<em>x</em> = 0.025, 0.05, 0.075, 0.1, 0.125, 0.25, and 0.275) via the molten salt method. X-ray diffraction (XRD) confirmed that all the samples retained an orthorhombic lattice structure in the <em>A</em>2<sub>1</sub><em>am</em> space group. This demonstrated decreased in cell volume and orthorhombicity as Nd<sup>3+</sup> concentration increased. Scanning electron microscopy (SEM) with particle size distribution histogram revealed a progressive reduction in grain size, forming smaller, plate-like structures with higher levels of Nd<sup>3+</sup>. The alteration in Nd<sup>3+</sup> concentration significantly lowered the ferroelectric transition temperature (<em>T</em><sub><em>c</em></sub>) and dielectric constant, primarily due to the reduced effect of Bi<sup>3+</sup> ions 6s<sup>2</sup> lone pairs on structural distortion. The compound with <em>x</em> = 0.275 demonstrated a diffuse ferroelectric transition, marked by an expanded <em>T</em><sub><em>c</em></sub> peak, illustrating the profound impact of Nd<sup>3+</sup> doping on SBN dielectric and ferroelectric properties. This study investigates the effects of Nd<sup>3+</sup> doping on the structural and dielectric properties of SBN, with implications for its potential use in ferroelectric applications such as FeRAM (Ferroelectric Random Access Memory).</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130177"},"PeriodicalIF":4.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.matchemphys.2024.130174
Łukasz Pawłowski , Szymon Mania , Adrianna Banach-Kopeć , Karol Staszczyk , Aleksandra Mirowska , Aleksandra Mielewczyk-Gryń , Robert Tylingo
In this study, the effects of molecular weight (high, medium, and low), concentration (0.1 and 0.5 %) and dissolution method (in a rarely used hydroxyacetic acid and utilizing a novel CO2 saturation) of chitosan on the microstructure, chemical composition, wettability, surface roughness, adhesion, corrosion resistance and antibacterial activity of chitosan coatings electrophoretically deposited (10 V, 1 min) on β titanium alloy Ti13Nb13Zr were investigated. Microstructural analysis showed that low molecular weight chitosan at low concentrations formed uniform coatings while increasing these parameters resulted in uneven coatings with agglomerates. Energy-dispersive X-ray and Fourier transform infrared spectroscopy analyses confirmed the presence of chitosan on all coated samples. Higher concentrations of chitosan yielded thicker coatings. Wettability tests confirmed hydrophilic properties for all samples, with contact angles around 70°. Surface roughness varied with chitosan concentration, showing increased roughness for higher concentrations. Adhesion tests showed the highest critical load for high molecular weight chitosan coatings with a concentration of 0.1 %. Corrosion tests revealed that low molecular weight chitosan coatings provided the best protection. Antimicrobial assays showed that chitosan coatings prepared using acid dissolution had strong bactericidal activity against both Gram-positive and Gram-negative bacteria, while those prepared using CO2 saturation showed limited bacteriostatic activity. These findings suggest that chitosan coatings, especially those prepared using acid dissolution, hold promise for biomedical applications requiring corrosion resistance and antibacterial properties.
{"title":"The influence of chitosan's molecular weight, concentration, and dissolution method on the properties of electrophoretically deposited coatings on the Ti13Nb13Zr alloy surface","authors":"Łukasz Pawłowski , Szymon Mania , Adrianna Banach-Kopeć , Karol Staszczyk , Aleksandra Mirowska , Aleksandra Mielewczyk-Gryń , Robert Tylingo","doi":"10.1016/j.matchemphys.2024.130174","DOIUrl":"10.1016/j.matchemphys.2024.130174","url":null,"abstract":"<div><div>In this study, the effects of molecular weight (high, medium, and low), concentration (0.1 and 0.5 %) and dissolution method (in a rarely used hydroxyacetic acid and utilizing a novel CO<sub>2</sub> saturation) of chitosan on the microstructure, chemical composition, wettability, surface roughness, adhesion, corrosion resistance and antibacterial activity of chitosan coatings electrophoretically deposited (10 V, 1 min) on β titanium alloy Ti13Nb13Zr were investigated. Microstructural analysis showed that low molecular weight chitosan at low concentrations formed uniform coatings while increasing these parameters resulted in uneven coatings with agglomerates. Energy-dispersive X-ray and Fourier transform infrared spectroscopy analyses confirmed the presence of chitosan on all coated samples. Higher concentrations of chitosan yielded thicker coatings. Wettability tests confirmed hydrophilic properties for all samples, with contact angles around 70°. Surface roughness varied with chitosan concentration, showing increased roughness for higher concentrations. Adhesion tests showed the highest critical load for high molecular weight chitosan coatings with a concentration of 0.1 %. Corrosion tests revealed that low molecular weight chitosan coatings provided the best protection. Antimicrobial assays showed that chitosan coatings prepared using acid dissolution had strong bactericidal activity against both Gram-positive and Gram-negative bacteria, while those prepared using CO<sub>2</sub> saturation showed limited bacteriostatic activity. These findings suggest that chitosan coatings, especially those prepared using acid dissolution, hold promise for biomedical applications requiring corrosion resistance and antibacterial properties.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130174"},"PeriodicalIF":4.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.matchemphys.2024.130169
Papori Seal , Aszad Alam , J.P. Borah
This study underscores the potential of nanocomposites of magnetite (Fe3O4) with amine functionalized multi-walled carbon nanotube (MWCNT) for applications in magnetic hyperthermia therapy, by optimizing the amine-functionalized MWCNT concentration to maintain favorable interactions with Fe3O4, avoiding excessive aggregation, and maximizing the hyperthermia performance. The magnetic property analysis revealed that the presence of amine-functionalized MWCNTs influenced the saturation magnetization (MS) of the nanocomposites, surprisingly, the FC1 (composite with 1 % amine-functionalized MWCNT) and FC3 (composite with 3 % amine-functionalized MWCNT) nanocomposites exhibited higher saturation magnetization (MS) compared to bare Fe3O4, attributed to the enhanced interaction between Fe3O4 and the amine-functionalized MWCNTs, which facilitated the cationic influx and alignment of surface spins. However, at higher concentrations of functionalized MWCNTs (FC7 and FC10), a reduction in MS was observed, possibly due to aggregation effects which can also be inferred from their cubic anisotropy value. Among the nanocomposites, FC3 exhibited the highest specific absorption rate (SAR), correlating with its enhanced MS, while FC10 showed the lowest SAR, consistent with its reduced MS. The SAR values were found to increase with the applied magnetic field amplitude, with FC3 surpassing bare Fe3O4 at higher field amplitudes, likely due to the predominant effects of Néel relaxation mechanisms. The observed enhancement in magnetic properties at optimal MWCNT concentrations presents a promising pathway for the design of advanced magnetic nanocomposites with improved performance in hyperthermia applications.
{"title":"Tailoring magnetic properties of Fe3O4 nanocomposites with amine-functionalized MWCNT for optimal hyperthermia performance","authors":"Papori Seal , Aszad Alam , J.P. Borah","doi":"10.1016/j.matchemphys.2024.130169","DOIUrl":"10.1016/j.matchemphys.2024.130169","url":null,"abstract":"<div><div>This study underscores the potential of nanocomposites of magnetite (Fe<sub>3</sub>O<sub>4</sub>) with amine functionalized multi-walled carbon nanotube (MWCNT) for applications in magnetic hyperthermia therapy, by optimizing the amine-functionalized MWCNT concentration to maintain favorable interactions with Fe<sub>3</sub>O<sub>4</sub>, avoiding excessive aggregation, and maximizing the hyperthermia performance. The magnetic property analysis revealed that the presence of amine-functionalized MWCNTs influenced the saturation magnetization (M<sub>S</sub>) of the nanocomposites, surprisingly, the FC1 (composite with 1 % amine-functionalized MWCNT) and FC3 (composite with 3 % amine-functionalized MWCNT) nanocomposites exhibited higher saturation magnetization (M<sub>S</sub>) compared to bare Fe<sub>3</sub>O<sub>4</sub>, attributed to the enhanced interaction between Fe<sub>3</sub>O<sub>4</sub> and the amine-functionalized MWCNTs, which facilitated the cationic influx and alignment of surface spins. However, at higher concentrations of functionalized MWCNTs (FC7 and FC10), a reduction in M<sub>S</sub> was observed, possibly due to aggregation effects which can also be inferred from their cubic anisotropy value. Among the nanocomposites, FC3 exhibited the highest specific absorption rate (SAR), correlating with its enhanced M<sub>S</sub>, while FC10 showed the lowest SAR, consistent with its reduced M<sub>S</sub>. The SAR values were found to increase with the applied magnetic field amplitude, with FC3 surpassing bare Fe<sub>3</sub>O<sub>4</sub> at higher field amplitudes, likely due to the predominant effects of Néel relaxation mechanisms. The observed enhancement in magnetic properties at optimal MWCNT concentrations presents a promising pathway for the design of advanced magnetic nanocomposites with improved performance in hyperthermia applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130169"},"PeriodicalIF":4.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we focus on the Cs-doping effect at the La-site in La1-xCsxMnO3 (x = 0; 0.05 and 0.1) manganite. Synthesized powders via the sol-gel auto-combustion route have been characterized by structural and magnetic measurements. All samples crystallize into a rhombohedral structure with R c space group as confirmed by Rietveld analysis of the X-ray diffraction (XRD) patterns. The diffraction analyses as function of temperature reveal a linear evolution of the structural parameters influencing the Jahn-Teller (J-T) distortion. Spherical nanoparticles have been observed by scanning electron microscopy (SEM). The energy-dispersive X-ray spectroscopy (EDS) analyses confirmed the expected presence of La, Cs, Mn and O ratio, as well as the phase purity of the synthesized materials. The polycrystalline grain structure was confirmed by transmission electron microscopy (TEM), where crystallite size obtained from TEM ranges from 21 nm to 120 nm as function of the composition and sintered temperature. The lattices fringes resolved in the high-resolution TEM (HRTEM) images confirmed the crystal rhombohedral symmetry of our compounds. X-ray photoelectron spectroscopy (XPS) studies demonstrate the mixed valence states of manganese ions (Mn4+ and Mn3+) in undoped as well as doped systems. The electron spin resonance (ESR) analyses confirmed the decreasing of the ferromagnetic ordering versus the increase of Cs doping. Soft ferromagnetism has been observed in all our La1-xCsxMnO3 (x = 0; 0.05 and 0.1) samples which can be attributed to the super exchange interaction between the magnetic ions. Surprisingly enough, the magnetization behavior is found to be a sum of ferromagnetic (FM), superparamagnetic (SPM) and paramagnetic (PM) contributions at low temperature (i.e. 4K). As expected, their behavior is PM at room temperature. This work shows how structural and magnetic properties can be greatly affected by small amount of La-substitution by Cs.
本文重点研究了 La1-xCsxMnO3（x = 0；0.05 和 0.1）锰矿中 La 位的铯掺杂效应。通过结构和磁性测量，对溶胶-凝胶自燃烧路线合成的粉末进行了表征。X 射线衍射（XRD）图的里特维尔德分析证实，所有样品都结晶成 R 3‾c 空间群的斜方晶体结构。随温度变化的衍射分析表明，影响 Jahn-Teller （J-T）畸变的结构参数呈线性变化。通过扫描电子显微镜（SEM）观察到了球形纳米颗粒。能量色散 X 射线光谱（EDS）分析证实了预期的 La、Cs、Mn 和 O 的存在比例，以及合成材料的相纯度。透射电子显微镜（TEM）证实了多晶体晶粒结构，从 TEM 中获得的晶粒大小在 21 nm 到 120 nm 之间，是成分和烧结温度的函数。高分辨率透射电子显微镜（HRTEM）图像中分辨出的晶格条纹证实了我们的化合物具有晶体斜方对称性。X 射线光电子能谱（XPS）研究证明了未掺杂和掺杂体系中锰离子（Mn4+ 和 Mn3+）的混合价态。电子自旋共振（ESR）分析证实了铁磁有序性随着掺杂铯的增加而降低。在所有 La1-xCsxMnO3（x = 0、0.05 和 0.1）样品中都观察到了软铁磁性，这可归因于磁性离子之间的超交换相互作用。令人惊讶的是，在低温（即 4K）下，磁化行为是铁磁性（FM）、超顺磁性（SPM）和顺磁性（PM）贡献的总和。不出所料，它们在室温下的行为是 PM。这项研究表明，少量的铯取代镧可以极大地影响结构和磁性能。
{"title":"Synthesis, characterization and magnetic behaviors of La1-xCsxMnO3 (0 ≤x ≤ 0.1) ceramics","authors":"Marwa Lassoued , Silvana Mercone , Cécile Autret-Lambert , Mohamed Baazaoui , Mohamed Oumezzine , Eric Bourhis , Pascal Andreazza","doi":"10.1016/j.matchemphys.2024.130101","DOIUrl":"10.1016/j.matchemphys.2024.130101","url":null,"abstract":"<div><div>In this paper, we focus on the Cs-doping effect at the La-site in La<sub>1-x</sub>Cs<sub>x</sub>MnO<sub>3</sub> (x = 0; 0.05 and 0.1) manganite. Synthesized powders via the sol-gel auto-combustion route have been characterized by structural and magnetic measurements. All samples crystallize into a rhombohedral structure with R <span><math><mrow><mover><mn>3</mn><mo>‾</mo></mover></mrow></math></span> c space group as confirmed by Rietveld analysis of the X-ray diffraction (XRD) patterns. The diffraction analyses as function of temperature reveal a linear evolution of the structural parameters influencing the Jahn-Teller (J-T) distortion. Spherical nanoparticles have been observed by scanning electron microscopy (SEM). The energy-dispersive X-ray spectroscopy (EDS) analyses confirmed the expected presence of La, Cs, Mn and O ratio, as well as the phase purity of the synthesized materials. The polycrystalline grain structure was confirmed by transmission electron microscopy (TEM), where crystallite size obtained from TEM ranges from 21 nm to 120 nm as function of the composition and sintered temperature. The lattices fringes resolved in the high-resolution TEM (HRTEM) images confirmed the crystal rhombohedral symmetry of our compounds. X-ray photoelectron spectroscopy (XPS) studies demonstrate the mixed valence states of manganese ions (Mn<sup>4+</sup> and Mn<sup>3+</sup>) in undoped as well as doped systems. The electron spin resonance (ESR) analyses confirmed the decreasing of the ferromagnetic ordering versus the increase of Cs doping. Soft ferromagnetism has been observed in all our La<sub>1-x</sub>Cs<sub>x</sub>MnO<sub>3</sub> (x = 0; 0.05 and 0.1) samples which can be attributed to the super exchange interaction between the magnetic ions. Surprisingly enough, the magnetization behavior is found to be a sum of ferromagnetic (FM), superparamagnetic (SPM) and paramagnetic (PM) contributions at low temperature (<em>i.e.</em> 4K). As expected, their behavior is PM at room temperature. This work shows how structural and magnetic properties can be greatly affected by small amount of La-substitution by Cs.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"330 ","pages":"Article 130101"},"PeriodicalIF":4.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.matchemphys.2024.130157
Navneet Kaur Mattu, K. Singh
43SiO2–25Na2O –7P2O5-(25-x) CaO -xMgO (x = 0, 5, 10, 15 (wt%)) glasses were synthesized using hybrid resources, i.e., biowastes and conventional chemicals. Non-isothermal crystallization kinetics of as-quenched glasses were investigated. The highest activation energy of crystallization (Ec) was observed for x = 15 wt% glass, i.e., 370 kJ mol−1. The as-prepared glasses were heat treated at (710–770 °C) for 1 h (h), 10 h, and 800 °C for 0.5 h to confirm the thermal results. The thermal expansion coefficient of glasses (∼10.4 × 10−6 °C-1) was decreased with MgO content and approached the range of human dentin and enamel. The MgO also hinders the crystallization in the present glasses. The M.T.T. assay test of glass and glass ceramics showed cell viability >80 % with a higher concentration of 200 μg/ml, even after 48 h on human peripheral blood mononuclear cells (P.B.M.C.). The biocompatibility of present glasses and glass ceramics was comparable to or even better than glass/glass ceramics synthesized using conventional chemicals. Utilizing these bioglasses and glass ceramics opens a pathway for hybrid sources to synthesize biomedical materials without hampering their bioactive properties.
{"title":"Crystallization effect on structural, mechanical and cytotoxic properties of bioglasses synthesized using conventional and biowaste as resources","authors":"Navneet Kaur Mattu, K. Singh","doi":"10.1016/j.matchemphys.2024.130157","DOIUrl":"10.1016/j.matchemphys.2024.130157","url":null,"abstract":"<div><div><em>43SiO</em><sub><em>2</em></sub>–<em>25Na</em><sub><em>2</em></sub><em>O –7P</em><sub><em>2</em></sub><em>O</em><sub><em>5</em></sub><em>-(25-x) CaO</em> -<em>xMgO (x = 0, 5, 10, 15 (wt%))</em> glasses were synthesized using hybrid resources, i.e., biowastes and conventional chemicals. Non-isothermal crystallization kinetics of as-quenched glasses were investigated. The highest activation energy of crystallization (<em>E</em><sub><em>c</em></sub>) was observed for x = 15 wt% glass, i.e., 370 kJ mol<sup>−1</sup>. The as-prepared glasses were heat treated at (710–770 °C) for 1 h (h), 10 h, and 800 °C for 0.5 h to confirm the thermal results. The thermal expansion coefficient of glasses (∼10.4 × 10<sup>−6</sup> °C<sup>-1</sup>) was decreased with MgO content and approached the range of human dentin and enamel. The MgO also hinders the crystallization in the present glasses. The M.T.T. assay test of glass and glass ceramics showed cell viability >80 % with a higher concentration of 200 μg/ml, even after 48 h on human peripheral blood mononuclear cells (P.B.M.C.). The biocompatibility of present glasses and glass ceramics was comparable to or even better than glass/glass ceramics synthesized using conventional chemicals. Utilizing these bioglasses and glass ceramics opens a pathway for hybrid sources to synthesize biomedical materials without hampering their bioactive properties.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130157"},"PeriodicalIF":4.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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