Ternary compounds are proven to be a more fascinating, owing to their potential to span a broader composition region of morphotropic phase boundary (MPB) – enhanced piezoelectric, electrostrictive, dielectric and ferroelectric properties. To activate defects dipoles, we perform MnO2 doping in ternary MPB compound 0.55 Pb(Ni1/3Nb2/3)O3-0.135PbZrO3-0.315PbTiO3 [PNN-PZ-PT]. Temperature dependent dielectric spectroscopy reveals relaxor-ferroelectric nature of the synthesized ceramics. With the poling treatment, P-E loop of xMn-PNN-PZ-PT is softened, which emphasizes that the poling introduces higher order structural instability in MPB structure. The evolution of structural instability is as evidenced by the emergence of additional anomaly in thermal profile of dielectric constant due to electrical poling of xMn-PNN-PZ-PT and no systematic difference between polarizing behaviour of poled and unpoled specimen (Arrott plots). In association with defects dipoles, pyroelectric response based figure of merits (FOMs) of PNN-PZ-PT are improved. FOMs are characteristics of pyroelectric materials that insights about their suitability for specific application. Fi is suppressed with MnO2 doping and Fv, Fe and increases with MnO2 doping. Our study reveals that tailored and precise acceptor doping is crucial for the simultaneous optimization of all pyroelectric FOMs.
{"title":"Optimization of pyroelectric figure of merit of PNN-PZ-PT composition at morphotropic phase boundary","authors":"Shubham Modgil , Mehak Aggarwal , Mukul Kumar , Arun Kumar Singh , Shobhna Dhiman , Gyaneshwar Sharma , Sanjeev Kumar","doi":"10.1016/j.matchemphys.2024.130058","DOIUrl":"10.1016/j.matchemphys.2024.130058","url":null,"abstract":"<div><div>Ternary compounds are proven to be a more fascinating, owing to their potential to span a broader composition region of morphotropic phase boundary (MPB) – enhanced piezoelectric, electrostrictive, dielectric and ferroelectric properties. To activate defects dipoles, we perform MnO<sub>2</sub> doping in ternary MPB compound 0.55 Pb(Ni<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-0.135PbZrO<sub>3</sub>-0.315PbTiO<sub>3</sub> [PNN-PZ-PT]. Temperature dependent dielectric spectroscopy reveals relaxor-ferroelectric nature of the synthesized ceramics. With the poling treatment, P-E loop of xMn-PNN-PZ-PT is softened, which emphasizes that the poling introduces higher order structural instability in MPB structure. The evolution of structural instability is as evidenced by the emergence of additional anomaly in thermal profile of dielectric constant due to electrical poling of xMn-PNN-PZ-PT and no systematic difference between polarizing behaviour of poled and unpoled specimen (Arrott plots). In association with defects dipoles, pyroelectric response based figure of merits (FOMs) of PNN-PZ-PT are improved. FOMs are characteristics of pyroelectric materials that insights about their suitability for specific application. F<sub>i</sub> is suppressed with MnO<sub>2</sub> doping and F<sub>v</sub>, F<sub>e</sub> and <span><math><mrow><msubsup><mi>F</mi><mi>e</mi><mo>∗</mo></msubsup></mrow></math></span> increases with MnO<sub>2</sub> doping. Our study reveals that tailored and precise acceptor doping is crucial for the simultaneous optimization of all pyroelectric FOMs.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130058"},"PeriodicalIF":4.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533405","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 : 2024-10-24DOI: 10.1016/j.matchemphys.2024.130050
S. Cathrin Lims , M. Jose , Sivakumar Aswathappa , S. Sahaya Jude Dhas , Raju Suresh Kumar , Phuong V. Pham
The increasing prevalence of organic pollutants in water sources necessitates the development of efficient and cost-effective photocatalysts for their degradation. ZnO nanoparticles (NPs) have been widely studied for their photocatalytic properties; however, their application is hindered by low photocatalytic efficiency and high recombination rates of photogenerated carriers. This manuscript explores the enhanced photocatalytic performance of intercalated ZnO/SiO2 nanocomposites (NCs), synthesized through a combination of co-precipitation and Stöber methods, as a solution to these challenges. A comprehensive analysis of the structural, optical elemental and Morphological properties of both ZnO NPs and ZnO/SiO2 NCs was conducted using various characterization techniques, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV–Vis spectrometry and Brunauer-Emmett-Teller (BET) analysis. Through, XRD analysis, the calculated crystallite sizes of ZnO NPs and ZnO/SiO₂ NCs were found to be 36 nm and 39 nm respectively. TEM images illustrated that the ZnO NPs and ZnO/SiO₂ NCs have crystallized in elongated spherical morphology. XPS and FTIR analyses provided the signature band details the presence of Cu and Si in their Zn2⁺ and Si⁴⁺ oxidation states. The optical bandgap energies were calculated to be 3.38 eV for ZnO NPs and 3.22 eV for ZnO/SiO₂ NCs. The enhanced photocatalytic efficiency of the ZnO/SiO2 NCs achieved an impressive degradation rate of 92 % for Rhodamine B (RhB), compared to a relatively lower rate of 81 % for pure ZnO NPs for the degradation of RhB under visible light due to its lower bandgap, high surface area, and lower electron-hole recombination rate. BET surface area measurements revealed that ZnO nanoparticles have a surface area of 11.234 m2/g, while ZnO/SiO₂ NCs show 57.118 m2/g, highlighting SiO₂'s enhancement. The NCs demonstrated exceptional reusability for degradation, sustaining high efficiency across multiple cycles. Its ability to scavenge superoxide radicals highlighted the effectiveness of the ZnO/SiO₂ NCs in environmental remediation, especially for wastewater treatment.
{"title":"Exploring the photocatalytic breakdown of organic pollutants using intercalated ZnO/SiO2 nanocomposites","authors":"S. Cathrin Lims , M. Jose , Sivakumar Aswathappa , S. Sahaya Jude Dhas , Raju Suresh Kumar , Phuong V. Pham","doi":"10.1016/j.matchemphys.2024.130050","DOIUrl":"10.1016/j.matchemphys.2024.130050","url":null,"abstract":"<div><div>The increasing prevalence of organic pollutants in water sources necessitates the development of efficient and cost-effective photocatalysts for their degradation. ZnO nanoparticles (NPs) have been widely studied for their photocatalytic properties; however, their application is hindered by low photocatalytic efficiency and high recombination rates of photogenerated carriers. This manuscript explores the enhanced photocatalytic performance of intercalated ZnO/SiO<sub>2</sub> nanocomposites (NCs), synthesized through a combination of co-precipitation and Stöber methods, as a solution to these challenges. A comprehensive analysis of the structural, optical elemental and Morphological properties of both ZnO NPs and ZnO/SiO<sub>2</sub> NCs was conducted using various characterization techniques, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV–Vis spectrometry and Brunauer-Emmett-Teller (BET) analysis. Through, XRD analysis, the calculated crystallite sizes of ZnO NPs and ZnO/SiO₂ NCs were found to be 36 nm and 39 nm respectively. TEM images illustrated that the ZnO NPs and ZnO/SiO₂ NCs have crystallized in elongated spherical morphology. XPS and FTIR analyses provided the signature band details the presence of Cu and Si in their Zn<sup>2</sup>⁺ and Si⁴⁺ oxidation states. The optical bandgap energies were calculated to be 3.38 eV for ZnO NPs and 3.22 eV for ZnO/SiO₂ NCs. The enhanced photocatalytic efficiency of the ZnO/SiO<sub>2</sub> NCs achieved an impressive degradation rate of 92 % for Rhodamine B (RhB), compared to a relatively lower rate of 81 % for pure ZnO NPs for the degradation of RhB under visible light due to its lower bandgap, high surface area, and lower electron-hole recombination rate. BET surface area measurements revealed that ZnO nanoparticles have a surface area of 11.234 m<sup>2</sup>/g, while ZnO/SiO₂ NCs show 57.118 m<sup>2</sup>/g, highlighting SiO₂'s enhancement. The NCs demonstrated exceptional reusability for degradation, sustaining high efficiency across multiple cycles. Its ability to scavenge superoxide radicals highlighted the effectiveness of the ZnO/SiO₂ NCs in environmental remediation, especially for wastewater treatment.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130050"},"PeriodicalIF":4.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532958","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}
Developing microwave absorption (MA) materials with a strong absorption ability over a wide bandwidth through a simple and environmentally friendly approach remains a tremendous challenge. Herein, we propose to use an Fe3+–tannic acid framework to assist the dispersion of multi-walled carbon nanotubes (MWCNTs) and successfully prepare MWCNTs/porous carbon/α-Fe2O3 composites through freeze-drying and subsequent heat treatment. The dielectric properties and MA performance can be regulated by the heat treatment temperature, which leads to tunable crystalline structure, composition, and graphitization degree of MWCNTs. Consequently, the MWCNTs/porous carbon/α-Fe2O3 composite heat-treated at 300 °C exhibits a high reflection loss (RL) of −58.9 dB and an effective absorption bandwidth (5.28 GHz) with a matched thickness of 2.26 mm at a filler proportion of only 5 wt%, and the related frequency bandwidth with RL below −10 dB reaches 14.3 GHz at a thickness of 2–5 mm. In conclusion, the balance between conduction and polarization loss endows the composite with excellent impedance matching and boosting MA performance. This study offers a guideline for fabricating excellent MA materials through a simple, environmentally friendly method.
通过简单、环保的方法开发在宽带宽范围内具有强大吸收能力的微波吸收（MA）材料仍然是一个巨大的挑战。在此，我们提出使用 Fe3+ 单宁酸框架来辅助多壁碳纳米管（MWCNTs）的分散，并通过冷冻干燥和随后的热处理成功制备了多壁碳纳米管/多孔碳/α-Fe2O3 复合材料。热处理温度可调节介电性能和 MA 性能，从而实现 MWCNTs 结晶结构、成分和石墨化程度的可调。因此，在 300 °C 下热处理的 MWCNTs/多孔碳/α-Fe2O3 复合材料表现出 -58.9 dB 的高反射损耗（RL）和有效吸收带宽（5.28 GHz），匹配厚度为 2.26 mm，填料比例仅为 5 wt%，RL 低于 -10 dB 的相关频率带宽达到 14.3 GHz，厚度为 2-5 mm。总之，传导损耗和极化损耗之间的平衡使复合材料具有出色的阻抗匹配和增强的 MA 性能。这项研究为通过简单、环保的方法制造出色的 MA 材料提供了指导。
{"title":"Fe2O3-decorated multiwall carbon nanotube composites for boosted microwave absorption","authors":"Jin-Bo Cheng , Li-Peng Meng , Xin Huang , Si-Yi Luo , Hai-Bo Zhao , Chun-Xia Zhao , Hao-Ran Huang , Hui Li , Yuan-Peng Wu","doi":"10.1016/j.matchemphys.2024.130066","DOIUrl":"10.1016/j.matchemphys.2024.130066","url":null,"abstract":"<div><div>Developing microwave absorption (MA) materials with a strong absorption ability over a wide bandwidth through a simple and environmentally friendly approach remains a tremendous challenge. Herein, we propose to use an Fe<sup>3+</sup>–tannic acid framework to assist the dispersion of multi-walled carbon nanotubes (MWCNTs) and successfully prepare MWCNTs/porous carbon/α-Fe<sub>2</sub>O<sub>3</sub> composites through freeze-drying and subsequent heat treatment. The dielectric properties and MA performance can be regulated by the heat treatment temperature, which leads to tunable crystalline structure, composition, and graphitization degree of MWCNTs. Consequently, the MWCNTs/porous carbon/α-Fe<sub>2</sub>O<sub>3</sub> composite heat-treated at 300 °C exhibits a high reflection loss (RL) of −58.9 dB and an effective absorption bandwidth (5.28 GHz) with a matched thickness of 2.26 mm at a filler proportion of only 5 wt%, and the related frequency bandwidth with RL below −10 dB reaches 14.3 GHz at a thickness of 2–5 mm. In conclusion, the balance between conduction and polarization loss endows the composite with excellent impedance matching and boosting MA performance. This study offers a guideline for fabricating excellent MA materials through a simple, environmentally friendly method.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130066"},"PeriodicalIF":4.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533578","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 : 2024-10-23DOI: 10.1016/j.matchemphys.2024.130080
M.M. Gouda, A.A. Mohammed, R.O. Abdel Rahman
Cs retention characteristics onto novel eco-friendly multi-barrier were investigated under dynamic conditions that simulate different environmental conditions. In this respect, nano-clay and quartz samples were tested to optimize the design of the multi-barrier based on the hydraulic and retention performances. The morphology, particle size distribution, mineralogical structure, zeta potential, chemical structure and function groups were investigated. Nano clay is composed of a mixture of Mica, Chlorite, and quartz with minor amounts of Palygorskiteand Sepiolite. The material exhibited superior cesium retention performances via exchange with the intercalated cations in minerals structure. The dynamic retention characteristics of cesium into the barrier were studied under different scenarios that accounts for different contamination levels. The active sites did not reach its saturation capacity and that the equilibrium retention reaction time is much less than the smallest residence time in the barrier. The scenario of saline water or ground water did not affect the performance of the barrier in retaining cesium. The retention reaction is following Freundlich isotherm whereas the reaction kinetics is a first order reaction independent on the studied scenario. Cesium transport through the barrier is subjected to hydrodynamic dispersion, where the retarded hydrodynamic dispersion coefficients are insensitive to the studied scenario.
{"title":"Investigations of retention characteristics of persistence contaminant into eco-friendly multi-layers barrier under dynamic conditions","authors":"M.M. Gouda, A.A. Mohammed, R.O. Abdel Rahman","doi":"10.1016/j.matchemphys.2024.130080","DOIUrl":"10.1016/j.matchemphys.2024.130080","url":null,"abstract":"<div><div>Cs retention characteristics onto novel eco-friendly multi-barrier were investigated under dynamic conditions that simulate different environmental conditions. In this respect, nano-clay and quartz samples were tested to optimize the design of the multi-barrier based on the hydraulic and retention performances. The morphology, particle size distribution, mineralogical structure, zeta potential, chemical structure and function groups were investigated. Nano clay is composed of a mixture of Mica, Chlorite, and quartz with minor amounts of Palygorskiteand Sepiolite. The material exhibited superior cesium retention performances via exchange with the intercalated cations in minerals structure. The dynamic retention characteristics of cesium into the barrier were studied under different scenarios that accounts for different contamination levels. The active sites did not reach its saturation capacity and that the equilibrium retention reaction time is much less than the smallest residence time in the barrier. The scenario of saline water or ground water did not affect the performance of the barrier in retaining cesium. The retention reaction is following Freundlich isotherm whereas the reaction kinetics is a first order reaction independent on the studied scenario. Cesium transport through the barrier is subjected to hydrodynamic dispersion, where the retarded hydrodynamic dispersion coefficients are insensitive to the studied scenario.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130080"},"PeriodicalIF":4.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533576","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 : 2024-10-23DOI: 10.1016/j.matchemphys.2024.130079
Seungeun Baek , Dongkyoung Lee
Icing impairs normal functionality for a variety of industries and applications. Research on hydrophobic surfaces is being conducted to solve the icing problem. In this study, a hydrophobic surface was fabricated on SM490A using a nanosecond laser. The change in surface microstructure was observed. Hydrophilicity was immediately observed right after laser irradiation, and the contact angle increased over time, resulting in hydrophobicity. To explain the wettability conversion, X-Ray Photoelectron Spectroscopy (XPS) was used to observe changes in surface chemical composition and element bonding. It was observed that the level of and increased immediately after laser irradiation, resulting in surface oxidation. Since the presence of oxides has high surface energies, they contribute to super hydrophilic surfaces. Since the bond has low surface energy and the content of nonpolar bonds and increased over time, the contact angle subsequently increases over time. When the ice shape was observed after dropping a droplet on the surface, the higher contact angle specimen reduced the attached area. Therefore, the surface treatment using a nanosecond laser can produce a hydrophobic surface on the SM490A specimens so that it may solve ice adhesion problems.
结冰会影响各种行业和应用的正常功能。为了解决结冰问题，人们正在对疏水表面进行研究。在这项研究中，使用纳秒激光在 SM490A 上制造了疏水表面。观察了表面微观结构的变化。激光照射后立即观察到亲水性，随着时间的推移，接触角增大，从而产生疏水性。为了解释润湿性的变化，使用了 X 射线光电子能谱 (XPS) 来观察表面化学成分和元素键合的变化。据观察，激光照射后，铁和 O 的含量立即增加，导致表面氧化。由于氧化物具有较高的表面能，它们有助于形成超亲水性表面。由于 C-C（H）键的表面能较低，非极性的 C-C（H）键和 C 的含量随着时间的推移而增加，接触角也随之增大。在表面滴下液滴后观察冰的形状时，接触角较高的试样减少了附着面积。因此，使用纳秒激光进行表面处理可在 SM490A 试样上形成疏水表面，从而解决冰附着问题。
{"title":"Investigation of wettability and icing on the steel surface using laser surface treatment","authors":"Seungeun Baek , Dongkyoung Lee","doi":"10.1016/j.matchemphys.2024.130079","DOIUrl":"10.1016/j.matchemphys.2024.130079","url":null,"abstract":"<div><div>Icing impairs normal functionality for a variety of industries and applications. Research on hydrophobic surfaces is being conducted to solve the icing problem. In this study, a hydrophobic surface was fabricated on SM490A using a nanosecond laser. The change in surface microstructure was observed. Hydrophilicity was immediately observed right after laser irradiation, and the contact angle increased over time, resulting in hydrophobicity. To explain the wettability conversion, X-Ray Photoelectron Spectroscopy (XPS) was used to observe changes in surface chemical composition and element bonding. It was observed that the level of <span><math><mrow><mtext>Fe</mtext></mrow></math></span> and <span><math><mrow><mi>O</mi></mrow></math></span> increased immediately after laser irradiation, resulting in surface oxidation. Since the presence of oxides has high surface energies, they contribute to super hydrophilic surfaces. Since the <span><math><mrow><mi>C</mi><mo>−</mo><mi>C</mi><mspace></mspace><mrow><mo>(</mo><mi>H</mi><mo>)</mo></mrow></mrow></math></span> bond has low surface energy and the content of nonpolar <span><math><mrow><mi>C</mi><mo>−</mo><mi>C</mi><mspace></mspace><mrow><mo>(</mo><mi>H</mi><mo>)</mo></mrow></mrow></math></span> bonds and <span><math><mrow><mi>C</mi></mrow></math></span> increased over time, the contact angle subsequently increases over time. When the ice shape was observed after dropping a droplet on the surface, the higher contact angle specimen reduced the attached area. Therefore, the surface treatment using a nanosecond laser can produce a hydrophobic surface on the SM490A specimens so that it may solve ice adhesion problems.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130079"},"PeriodicalIF":4.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553775","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 : 2024-10-22DOI: 10.1016/j.matchemphys.2024.130065
Maruti B. Kumbhar , Vaishali S. Chandak , Prakash M. Kulal
We have comprehensively analyzed the influence of Cu and Co-doping on the structural, compositional, optical, and ammonia sensing characteristics of NiO thin films. The X-ray diffraction analysis revealed that pure NiO, Cu, and Co-doped NiO thin films possess a cubic structure. Remarkably, the Co-dopant caused a transformation in the crystallite size and surface structure of NiO. This alteration ultimately enhanced the sensing capabilities of Co-doped NiO thin films. The presence of Co decreased the amount of energy needed to activate Co-doped NiO, resulting in enhanced sensing capabilities of the doped samples for detecting 50 parts per million of ammonia with a response time of 20 s and recovery time of 16 s and having a percentage response of 76.25 %. The enhanced sensor responsiveness and selectivity of the Co-doped NiO sensor towards ammonia can be attributed to its increased surface area, smaller crystallite sizes, and superior surface properties. The remarkable results of Co-doped NiO thin films exhibited show a potential for use in the production of highly efficient ammonia gas-detecting devices.
我们全面分析了 Cu 和 Co 掺杂对氧化镍薄膜的结构、成分、光学和氨传感特性的影响。X 射线衍射分析表明，纯 NiO、Cu 和 Co 掺杂的 NiO 薄膜具有立方结构。值得注意的是，掺杂 Co 引起了氧化镍晶粒大小和表面结构的变化。这种变化最终增强了掺钴氧化镍薄膜的传感能力。钴的存在降低了激活掺钴氧化镍所需的能量，从而增强了掺钴样品的传感能力，可检测百万分之 50 的氨气，响应时间为 20 秒，恢复时间为 16 秒，响应百分比为 76.25%。掺杂 Co 的氧化镍传感器对氨的响应性和选择性的增强可归因于其表面积的增大、晶体尺寸的减小以及优异的表面特性。掺钴氧化镍薄膜取得的卓越成果表明，它有望用于生产高效的氨气检测设备。
{"title":"Enhanced ammonia gas sensing performance at room temperature of binder-free NiO, Cu and Co-doped NiO thin films synthesized via the SILAR method","authors":"Maruti B. Kumbhar , Vaishali S. Chandak , Prakash M. Kulal","doi":"10.1016/j.matchemphys.2024.130065","DOIUrl":"10.1016/j.matchemphys.2024.130065","url":null,"abstract":"<div><div>We have comprehensively analyzed the influence of Cu and Co-doping on the structural, compositional, optical, and ammonia sensing characteristics of NiO thin films. The X-ray diffraction analysis revealed that pure NiO, Cu, and Co-doped NiO thin films possess a cubic structure. Remarkably, the Co-dopant caused a transformation in the crystallite size and surface structure of NiO. This alteration ultimately enhanced the sensing capabilities of Co-doped NiO thin films. The presence of Co decreased the amount of energy needed to activate Co-doped NiO, resulting in enhanced sensing capabilities of the doped samples for detecting 50 parts per million of ammonia with a response time of 20 s and recovery time of 16 s and having a percentage response of 76.25 %. The enhanced sensor responsiveness and selectivity of the Co-doped NiO sensor towards ammonia can be attributed to its increased surface area, smaller crystallite sizes, and superior surface properties. The remarkable results of Co-doped NiO thin films exhibited show a potential for use in the production of highly efficient ammonia gas-detecting devices.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130065"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533577","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 : 2024-10-22DOI: 10.1016/j.matchemphys.2024.130032
Tran Dang Khoa , Le Thanh Hoang Duc , Pham Duc Nghi , Ho Thi Thuy Huynh , Nguyen Thi Ngoc Hieu , Dang Thanh Cong Minh , Nguyen Thanh Hoai Nam , Nguyen Thuy Diem Thao , Pham Le Kim Hoang , Nguyen Huu Hieu
In this research, tin selenide nanoparticles (SnSe-NPs) were synthesized using Polygonum avicular extract via the hydrothermal method and decorated on graphitic carbon nitride (g-C3N4) by the simple sonicated method to produce SnSe/g-C3N4 composites. The characterization and properties of the SnSe/g-C3N4 composites, as compared to pristine SnSe and g-C3N4, were determined by Fourier-transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, Mott-Schottky, and electrochemical impedance spectroscopy. As a result, the SnSe-NPs possessed the rod-like shape and after the decoration onto the g-C3N4 sheet surface, it reduced the bandgap energy of the g-C3N4 from 2.58 downward 1.43 eV. Besides, the photoactivities of the 10-SnSe/g-C3N4 catalyst were investigated via both sides of amoxicillin trihydrate (AMXT) photodegradation and hydrogen peroxide (H2O2) photoproduction, in which the results were achieved 87.84 % AMXT and 85.48 μM H2O2, respectively, under visible light. Furthermore, the photodegradation was consistent with the pseudo-first-order kinetics and it performed the highest photodegradation at pH ∼5, while the importance of isopropyl alcohol as a trapping agent and •O2− radicals was affirmed in the H2O2 photoproduction. Moreover, the photoproduction of H2O2 was remained after 4 cycles achieved at 62.70 % in the final cycle, which demonstrated the stability and reusability of the 10-SnSe/g-C3N4. These aforementioned results demonstrate that the SnSe/g-C3N4 material is a promising candidate for addressing environmental pollution and energy scarcity issues.
{"title":"Synthesis of tin selenide nanoparticles using Polygonum avicular extract decorated on graphitic carbon nitride for enhancing photodegradation of amoxicillin trihydrate and photoproduction of hydrogen peroxide","authors":"Tran Dang Khoa , Le Thanh Hoang Duc , Pham Duc Nghi , Ho Thi Thuy Huynh , Nguyen Thi Ngoc Hieu , Dang Thanh Cong Minh , Nguyen Thanh Hoai Nam , Nguyen Thuy Diem Thao , Pham Le Kim Hoang , Nguyen Huu Hieu","doi":"10.1016/j.matchemphys.2024.130032","DOIUrl":"10.1016/j.matchemphys.2024.130032","url":null,"abstract":"<div><div>In this research, tin selenide nanoparticles (SnSe-NPs) were synthesized using <em>Polygonum avicular</em> extract via the hydrothermal method and decorated on graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) by the simple sonicated method to produce SnSe/g-C<sub>3</sub>N<sub>4</sub> composites. The characterization and properties of the SnSe/g-C<sub>3</sub>N<sub>4</sub> composites, as compared to pristine SnSe and g-C<sub>3</sub>N<sub>4</sub>, were determined by Fourier-transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, Mott-Schottky, and electrochemical impedance spectroscopy. As a result, the SnSe-NPs possessed the rod-like shape and after the decoration onto the g-C<sub>3</sub>N<sub>4</sub> sheet surface, it reduced the bandgap energy of the g-C<sub>3</sub>N<sub>4</sub> from 2.58 downward 1.43 eV. Besides, the photoactivities of the 10-SnSe/g-C<sub>3</sub>N<sub>4</sub> catalyst were investigated via both sides of amoxicillin trihydrate (AMXT) photodegradation and hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) photoproduction, in which the results were achieved 87.84 % AMXT and 85.48 μM H<sub>2</sub>O<sub>2</sub>, respectively, under visible light. Furthermore, the photodegradation was consistent with the pseudo-first-order kinetics and it performed the highest photodegradation at pH ∼5, while the importance of isopropyl alcohol as a trapping agent and •O<sub>2</sub><sup>−</sup> radicals was affirmed in the H<sub>2</sub>O<sub>2</sub> photoproduction. Moreover, the photoproduction of H<sub>2</sub>O<sub>2</sub> was remained after 4 cycles achieved at 62.70 % in the final cycle, which demonstrated the stability and reusability of the 10-SnSe/g-C<sub>3</sub>N<sub>4</sub>. These aforementioned results demonstrate that the SnSe/g-C<sub>3</sub>N<sub>4</sub> material is a promising candidate for addressing environmental pollution and energy scarcity issues.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130032"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533574","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}
Reducing the amount of fine particulate matter (PM) in the atmosphere is essential for preserving a secure and healthy environment. Here, we synthesized zeolite N (potassium ion form, KN) from kaolin clay minerals, coated it on cotton fabric using a simple refluxing method and then removed PM from the air. The following conclusion can be drawn. The average cation exchange capacity (CEC) of KN was 512 meq/100 g, and a CEC value > 400 meq/100 g indicated pure zeolite with a Si/Al ratio of approximately 1.0. The synthesized KN, containing a high proportion of Al, proved highly effective in removing particulates. For instance, KN/cotton (746 GSM (weight of fabric in g/m2) cotton, coated with approximately 1.46 wt% KN) demonstrated an 8-times higher removal efficiency (RE) for PM2.5 and PM1.0 than bare 746 GSM cotton, with only a 7 Pa increase in the pressure drop. PM may have been removed by electrostatic interactions between the charged PM and KN (with charge-balancing cations) owing to the charges and polarity of the outer layer of PM particles. According to the increases in RE and the quality factor, KN/cotton (746 GSM) was the most effective in removing PM from the air compared to other materials. The results suggested that KN, when applied to the surface of cotton fabric, is highly efficient due to its EDI framework structure and high Al content. Finally, biodegradation tests revealed that used filters disintegrated into pieces after being buried for one month in soil, indicating their environmental friendliness.
{"title":"Surface modification of cotton fabric by kaolin-derived zeolite N to enhance efficient removal of particulate matter","authors":"Jutatip Sommana , Samroeng Narakaew , Songkot Utara , Siwat Thungprasert , Theeraporn Promanan , Aphiruk Chaisena","doi":"10.1016/j.matchemphys.2024.130073","DOIUrl":"10.1016/j.matchemphys.2024.130073","url":null,"abstract":"<div><div>Reducing the amount of fine particulate matter (PM) in the atmosphere is essential for preserving a secure and healthy environment. Here, we synthesized zeolite N (potassium ion form, KN) from kaolin clay minerals, coated it on cotton fabric using a simple refluxing method and then removed PM from the air. The following conclusion can be drawn. The average cation exchange capacity (CEC) of KN was 512 meq/100 g, and a CEC value > 400 meq/100 g indicated pure zeolite with a Si/Al ratio of approximately 1.0. The synthesized KN, containing a high proportion of Al, proved highly effective in removing particulates. For instance, KN/cotton (746 GSM (weight of fabric in g/m<sup>2</sup>) cotton, coated with approximately 1.46 wt% KN) demonstrated an 8-times higher removal efficiency (RE) for PM2.5 and PM1.0 than bare 746 GSM cotton, with only a 7 Pa increase in the pressure drop. PM may have been removed by electrostatic interactions between the charged PM and KN (with charge-balancing cations) owing to the charges and polarity of the outer layer of PM particles. According to the increases in RE and the quality factor, KN/cotton (746 GSM) was the most effective in removing PM from the air compared to other materials. The results suggested that KN, when applied to the surface of cotton fabric, is highly efficient due to its EDI framework structure and high Al content. Finally, biodegradation tests revealed that used filters disintegrated into pieces after being buried for one month in soil, indicating their environmental friendliness.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130073"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533575","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 : 2024-10-22DOI: 10.1016/j.matchemphys.2024.130075
Marzieh Golshan , Mahshid Akbari-Meinagh , Ali Akbar Alizadeh , Mehdi Salami-Kalajahi
A poly(amidoamine) (PAMAM) dendrimer is prepared using a divergent method, with perylene-3,4,9,10-tetracarboxylic diimide (PTCDI) as luminescent core. The peripheral amines are modified using α-bromoisobutyryl bromide, allowing the dendrimers to act as macroinitiators for the synthesis of poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) through atom transfer radical polymerization (ATRP) with three different degrees of polymerization. The successful synthesis is verified by conducting a range of analyses, including Fourier-transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance (1H NMR) spectroscopy, and X-ray diffraction (XRD). Additionally, the impact of changes in solution pH on the self-assembly of dendrimers is explored. Field emission scanning electron microscopy (FE-SEM) and dynamic light scattering (DLS) showed unique morphologies, including spherical micelles and cubic-hexagonal structures, at varying pH levels. The self-assembled dendrimers are utilized to load doxorubicin (DOX) and the drug release kinetics are studied under various conditions. The biocompatibility of the dendrimers is assessed using the MTT assay against SH-SY5Y cells. Additionally, higher dendrimer generations improved the solubility, compatibility, and fluorescent properties of the core. The dendrimers' capacity for cellular uptake and fluorescence imaging is also evaluated using SH-SY5Y cells, demonstrating their effectiveness in live-cell fluorescence imaging.
{"title":"Synthesis and self-assembly of perylene-cored poly(amidoamine) dendrimers with poly[2-(dimethylamino)ethyl methacrylate]-modified arms as fluorescent bio-imaging probes and doxorubicin carriers","authors":"Marzieh Golshan , Mahshid Akbari-Meinagh , Ali Akbar Alizadeh , Mehdi Salami-Kalajahi","doi":"10.1016/j.matchemphys.2024.130075","DOIUrl":"10.1016/j.matchemphys.2024.130075","url":null,"abstract":"<div><div>A poly(amidoamine) (PAMAM) dendrimer is prepared using a divergent method, with perylene-3,4,9,10-tetracarboxylic diimide (PTCDI) as luminescent core. The peripheral amines are modified using α-bromoisobutyryl bromide, allowing the dendrimers to act as macroinitiators for the synthesis of poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) through atom transfer radical polymerization (ATRP) with three different degrees of polymerization. The successful synthesis is verified by conducting a range of analyses, including Fourier-transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance (<sup>1</sup>H NMR) spectroscopy, and X-ray diffraction (XRD). Additionally, the impact of changes in solution pH on the self-assembly of dendrimers is explored. Field emission scanning electron microscopy (FE-SEM) and dynamic light scattering (DLS) showed unique morphologies, including spherical micelles and cubic-hexagonal structures, at varying pH levels. The self-assembled dendrimers are utilized to load doxorubicin (DOX) and the drug release kinetics are studied under various conditions. The biocompatibility of the dendrimers is assessed using the MTT assay against SH-SY5Y cells. Additionally, higher dendrimer generations improved the solubility, compatibility, and fluorescent properties of the core. The dendrimers' capacity for cellular uptake and fluorescence imaging is also evaluated using SH-SY5Y cells, demonstrating their effectiveness in live-cell fluorescence imaging.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130075"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532959","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 : 2024-10-22DOI: 10.1016/j.matchemphys.2024.130074
Zhencheng Li, Hong Chang, Yongde Xia, Yanqiu Zhu
Vanadium dioxide (VO2) has great potentials to be used in energy-related fields due to its unique reversible thermochromic metal-insulating properties. In this paper, we used in-situ XRD technique to study the phase transition kinetics of VO2 thin films, which can change phase from monoclinic VO2 (M) to tetragonal rutile VO2 (R). The VO2 thin films were prepared by a simple solution-based sol-gel method followed by spin coating to achieve the nanoscale thickness on a quartz substrate. During heating, the critical phase transition of VO2 (M) occurred at 70 °C, which dropped to 45 °C during cooling. A martensite-like crystal phase transformation kinetic model was established based on the Koistinen and Marburger (KM) technique. The relative content of the two phases was quantitatively analyzed using the Rietveld method, and the transformation rate coefficient α was obtained as 0.20345 and 0.12585, for the heating process from VO2 (M) to VO2 (R) and the cooling process from VO2 (R) to VO2 (M), respectively. This research offers an effective tool for understanding the structural characteristics of thin film VO2, paving the way for its future design and applications towards energy-related fields such as in smart windows.
{"title":"In-situ XRD study on phase transition kinetics of vanadium dioxide thin film","authors":"Zhencheng Li, Hong Chang, Yongde Xia, Yanqiu Zhu","doi":"10.1016/j.matchemphys.2024.130074","DOIUrl":"10.1016/j.matchemphys.2024.130074","url":null,"abstract":"<div><div>Vanadium dioxide (VO<sub>2</sub>) has great potentials to be used in energy-related fields due to its unique reversible thermochromic metal-insulating properties. In this paper, we used in-situ XRD technique to study the phase transition kinetics of VO<sub>2</sub> thin films, which can change phase from monoclinic VO<sub>2</sub> (M) to tetragonal rutile VO<sub>2</sub> (R). The VO<sub>2</sub> thin films were prepared by a simple solution-based sol-gel method followed by spin coating to achieve the nanoscale thickness on a quartz substrate. During heating, the critical phase transition of VO<sub>2</sub> (M) occurred at 70 °C, which dropped to 45 °C during cooling. A martensite-like crystal phase transformation kinetic model was established based on the Koistinen and Marburger (KM) technique. The relative content of the two phases was quantitatively analyzed using the Rietveld method, and the transformation rate coefficient α was obtained as 0.20345 and 0.12585, for the heating process from VO<sub>2</sub> (M) to VO<sub>2</sub> (R) and the cooling process from VO<sub>2</sub> (R) to VO<sub>2</sub> (M), respectively. This research offers an effective tool for understanding the structural characteristics of thin film VO<sub>2</sub>, paving the way for its future design and applications towards energy-related fields such as in smart windows.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130074"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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