Materials Chemistry and Physics最新文献_第6页

Modern designs of electrochemical sensor for accurate drug analysis in pharmaceutical and biological samples: Principles, nanofabrication, and key challenges

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-21 DOI: 10.1016/j.matchemphys.2025.130588

Ahmed Barhoum , Abanoub Naseef , Yomna M. Ahmed , Magdy Kandil Zahran , Yaser Alhashemi , Mazen S. Mohamed , Mahmoud S. Rizk , Fatehy M. Abdel-Haleem

This comprehensive review discusses the recent advancements in electrochemical sensors tailored for precise drug analysis in pharmaceutical and biological samples. It extensively covers various electrochemical sensing techniques, including voltammetry, amperometry, impedance spectroscopy, and potentiometry. The review also discusses electrode nanofabrication methods such as screen printing, electrodeposition, vapor deposition, sol-gel processes, inkjet printing, 3D printing, and lithography, as well as diverse approaches for modifying electrode surfaces, like self-assembled monolayers, drop-casting, and molecular imprinting. Notably, the review spotlights innovations involving nanoparticles and nanostructured materials, such as metal nanoparticles, metal oxides, quantum dots, carbon nanomaterials, and hydrogels, which aim to enhance sensor performance. The latest research provides critical performance metrics, such as sensitivity, selectivity, limit of detection, and linear dynamic range, offering insights into the evolving capabilities of these sensors. Furthermore, the article highlights groundbreaking sensor designs, including wearable devices, smartphone-compatible sensors, and disposable paper-based sensors. In essence, this all-encompassing review aims to inspire ongoing research and the development of cutting-edge electrochemical sensors, ultimately advancing the field to enable precise drug analysis in both clinical and research settings.

{"title":"Modern designs of electrochemical sensor for accurate drug analysis in pharmaceutical and biological samples: Principles, nanofabrication, and key challenges","authors":"Ahmed Barhoum , Abanoub Naseef , Yomna M. Ahmed , Magdy Kandil Zahran , Yaser Alhashemi , Mazen S. Mohamed , Mahmoud S. Rizk , Fatehy M. Abdel-Haleem","doi":"10.1016/j.matchemphys.2025.130588","DOIUrl":"10.1016/j.matchemphys.2025.130588","url":null,"abstract":"<div><div>This comprehensive review discusses the recent advancements in electrochemical sensors tailored for precise drug analysis in pharmaceutical and biological samples. It extensively covers various electrochemical sensing techniques, including voltammetry, amperometry, impedance spectroscopy, and potentiometry. The review also discusses electrode nanofabrication methods such as screen printing, electrodeposition, vapor deposition, sol-gel processes, inkjet printing, 3D printing, and lithography, as well as diverse approaches for modifying electrode surfaces, like self-assembled monolayers, drop-casting, and molecular imprinting. Notably, the review spotlights innovations involving nanoparticles and nanostructured materials, such as metal nanoparticles, metal oxides, quantum dots, carbon nanomaterials, and hydrogels, which aim to enhance sensor performance. The latest research provides critical performance metrics, such as sensitivity, selectivity, limit of detection, and linear dynamic range, offering insights into the evolving capabilities of these sensors. Furthermore, the article highlights groundbreaking sensor designs, including wearable devices, smartphone-compatible sensors, and disposable paper-based sensors. In essence, this all-encompassing review aims to inspire ongoing research and the development of cutting-edge electrochemical sensors, ultimately advancing the field to enable precise drug analysis in both clinical and research settings.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130588"},"PeriodicalIF":4.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478626","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}

引用次数: 0

Dry sliding and mechanical characteristics of aerospace grade aluminium composite reinforced with TiO2/BN particle

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-21 DOI: 10.1016/j.matchemphys.2025.130577

Anil Chourasiya, C.M. Krishna

The current work examined the development of the AA7050 composite reinforced with different weight percentages of TiO₂ (1, 2 %) and BN (0.5, 1, 1.5 %) particles utilizing a liquid metallurgy process combined with an ultrasonic transducer. The crystal structural, mechanical, and dry sliding wear behaviour of the manufactured composite was investigated. Advanced characterization techniques like as optical microscopy, FESEM, and optical profilometer analysis were employed to investigate microstructure and worn surface morphology. The composite wear test was carried out on a pin-on-disc configuration under dry sliding circumstances, using various sliding distances and typical loads. Microstructure analysis of the composite reveals a homogeneous division of reinforcing particles across the matrix. The results of the mechanical and wear tests revealed that the compound with 2 % TiO₂ by weight and 1 % BN particles has optimum value. The maximum values of microhardness and compressive strength are found to be 177 HV and 541.73 MPa, respectively. This increase in the mechanical properties of the composite is due to the hard nature of TiO₂/BN particles. FESEM examination of worn out wear pin shows wear debris, small grooves, cracks, and ploughing on the surface. Surface roughness and 3D analysis of worn surfaces were analyzed using an optical profilometer.

{"title":"Dry sliding and mechanical characteristics of aerospace grade aluminium composite reinforced with TiO2/BN particle","authors":"Anil Chourasiya, C.M. Krishna","doi":"10.1016/j.matchemphys.2025.130577","DOIUrl":"10.1016/j.matchemphys.2025.130577","url":null,"abstract":"<div><div>The current work examined the development of the AA7050 composite reinforced with different weight percentages of TiO<sub>2</sub> (1, 2 %) and BN (0.5, 1, 1.5 %) particles utilizing a liquid metallurgy process combined with an ultrasonic transducer. The crystal structural, mechanical, and dry sliding wear behaviour of the manufactured composite was investigated. Advanced characterization techniques like as optical microscopy, FESEM, and optical profilometer analysis were employed to investigate microstructure and worn surface morphology. The composite wear test was carried out on a pin-on-disc configuration under dry sliding circumstances, using various sliding distances and typical loads. Microstructure analysis of the composite reveals a homogeneous division of reinforcing particles across the matrix. The results of the mechanical and wear tests revealed that the compound with 2 % TiO<sub>2</sub> by weight and 1 % BN particles has optimum value. The maximum values of microhardness and compressive strength are found to be 177 HV and 541.73 MPa, respectively. This increase in the mechanical properties of the composite is due to the hard nature of TiO<sub>2</sub>/BN particles. FESEM examination of worn out wear pin shows wear debris, small grooves, cracks, and ploughing on the surface. Surface roughness and 3D analysis of worn surfaces were analyzed using an optical profilometer.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130577"},"PeriodicalIF":4.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471634","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}

引用次数: 0

Effect of hydrogen evolution on morphology and capillary performance of electrodeposited copper wicks

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-21 DOI: 10.1016/j.matchemphys.2025.130560

Po-Hsun He , Chao-Yang Chiang , Jui-Cheng Yu , En-Chia Liu , Chien-Neng Liao

Effective thermal management is critical for ensuring the performance and reliability of high-power microelectronic devices. Vapor chambers (VCs) can facilitate heat dissipation through phase change and capillary circulation of the working fluid within the VC. Capillary wicks, the key to liquid circulation, are evaluated by the ratio of liquid permeability (K) to effective pore radius (R_eff). In this study, porous copper wicks are electrodeposited with concurrently evolved hydrogen bubbles. The wick's morphology is modulated by varying sulfuric acid concentrations in the copper sulfate electrolyte. A geometric parameter, namely effective fluid transport volume (V_eff) has been proposed to assess the permeability of working fluid in the porous copper wicks. The electrodeposited copper wicks demonstrate an optimal capillary performance (K/R_eff) value of 1.31 μm, surpassing the performance metrics of conventional powder-sintered copper wicks. This study presents a one-step electrodeposition method to modulate the morphology of porous copper wicks, thereby influencing their capillary performance through the strategic modification of the electrolyte.

{"title":"Effect of hydrogen evolution on morphology and capillary performance of electrodeposited copper wicks","authors":"Po-Hsun He , Chao-Yang Chiang , Jui-Cheng Yu , En-Chia Liu , Chien-Neng Liao","doi":"10.1016/j.matchemphys.2025.130560","DOIUrl":"10.1016/j.matchemphys.2025.130560","url":null,"abstract":"<div><div>Effective thermal management is critical for ensuring the performance and reliability of high-power microelectronic devices. Vapor chambers (VCs) can facilitate heat dissipation through phase change and capillary circulation of the working fluid within the VC. Capillary wicks, the key to liquid circulation, are evaluated by the ratio of liquid permeability (<em>K</em>) to effective pore radius (<em>R</em><sub><em>eff</em></sub>). In this study, porous copper wicks are electrodeposited with concurrently evolved hydrogen bubbles. The wick's morphology is modulated by varying sulfuric acid concentrations in the copper sulfate electrolyte. A geometric parameter, namely effective fluid transport volume (<em>V</em><sub><em>eff</em></sub>) has been proposed to assess the permeability of working fluid in the porous copper wicks. The electrodeposited copper wicks demonstrate an optimal capillary performance (<em>K/R</em><sub><em>eff</em></sub>) value of 1.31 μm, surpassing the performance metrics of conventional powder-sintered copper wicks. This study presents a one-step electrodeposition method to modulate the morphology of porous copper wicks, thereby influencing their capillary performance through the strategic modification of the electrolyte.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130560"},"PeriodicalIF":4.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478627","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}

引用次数: 0

Structural, Thermal and Mechanical Properties of mechanically alloyed Ni80Co17Mo3 powder mixture

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-21 DOI: 10.1016/j.matchemphys.2025.130586

B. Smili , H. Rafai , E. Sakher , M. Sakmeche , S. Chadli , R. Tigrine , R. Pesci , M. Bououdina , S. Bellucci

This study investigates the evolution of structure and microstructure alongside thermomechanical properties of Ni₈₀Co₁₇Mo₃ alloy powder mixture subjected to high-energy mechanical milling. Scanning electron microscopy observations reveal a consistent particle size reduction to 22 ± 2 μm. X-ray diffraction analysis confirms the formation of an FCC nanostructured solid solution NiCo(Mo) after 6h of milling, with a mean crystallite size ⁓ 56.4 nm and microstrain up to 6.5×10⁻³ % after 72 h. Thermogravimetric analysis manifests a precise mass gain trend, showing a strong correlation (R² = 0.90–0.99) between milling time and compositional changes, with an average activation energy of 70.68 ± 3.5 kJ/mol supporting the thermodynamic modelling results. Due to structural and microstructural modifications associated with mechanical milling, the microhardness significantly increases from 134.00 to 285.00 HV. These findings highlight insights into optimizing nanostructured materials and provide a framework for designing advanced materials for water splitting and aerospace.

{"title":"Structural, Thermal and Mechanical Properties of mechanically alloyed Ni80Co17Mo3 powder mixture","authors":"B. Smili , H. Rafai , E. Sakher , M. Sakmeche , S. Chadli , R. Tigrine , R. Pesci , M. Bououdina , S. Bellucci","doi":"10.1016/j.matchemphys.2025.130586","DOIUrl":"10.1016/j.matchemphys.2025.130586","url":null,"abstract":"<div><div>This study investigates the evolution of structure and microstructure alongside thermomechanical properties of Ni<sub>80</sub>Co<sub>17</sub>Mo<sub>3</sub> alloy powder mixture subjected to high-energy mechanical milling. Scanning electron microscopy observations reveal a consistent particle size reduction to 22 ± 2 μm. X-ray diffraction analysis confirms the formation of an FCC nanostructured solid solution NiCo(Mo) after 6h of milling, with a mean crystallite size ⁓ 56.4 nm and microstrain up to 6.5×10<sup>−3</sup> % after 72 h. Thermogravimetric analysis manifests a precise mass gain trend, showing a strong correlation (R<sup>2</sup> = 0.90–0.99) between milling time and compositional changes, with an average activation energy of 70.68 ± 3.5 kJ/mol supporting the thermodynamic modelling results. Due to structural and microstructural modifications associated with mechanical milling, the microhardness significantly increases from 134.00 to 285.00 HV. These findings highlight insights into optimizing nanostructured materials and provide a framework for designing advanced materials for water splitting and aerospace.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130586"},"PeriodicalIF":4.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510972","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}

引用次数: 0

The method of pre-bonding and second bonding based on Mo/Au metal adhesion layers for the application of chips bonding 基于钼/金金属粘合层的预粘合和二次粘合方法在芯片粘合中的应用

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-21 DOI: 10.1016/j.matchemphys.2025.130589

Kang Wang , Jiao Fu , Yongqiang Ji , Wenbo Hu , Hongxing Wang , Shengli Wu

In order to improve bonding quality, a method of pre-bonding and second bonding based on Mo/Au metal adhesion layers was implemented to bond two semiconductor chips. After sputtering Mo/Au thin film on the substrates, two chips taken out from magnetron sputtering were first brought into contact with each other and applied to a pressure of 20 N, which is called pre-bonding. Then a pressure of 2000 N was applied to complete second bonding by using a wafer bonding machine. Pre-bonding and second bonding were both carried out at room temperature and atmospheric environment. The results indicate this method can significantly reduce void density, and a Mo/Au (10 nm/30 nm) nano-adhesion layer can achieve extremely low void density (0.3 %) after this bonding process, also, the original grain boundaries at Au/Au bonding interface have disappeared. While without pre-bonding, more bonding voids were found in the interface, with a minimum size of approximately 40 nm. And a nano-gap (∼2 nm) was clearly observed between the two bonding voids with transmission electron microscope, indicating that Au and Au bonding surfaces were not completely bonded together.

{"title":"The method of pre-bonding and second bonding based on Mo/Au metal adhesion layers for the application of chips bonding","authors":"Kang Wang , Jiao Fu , Yongqiang Ji , Wenbo Hu , Hongxing Wang , Shengli Wu","doi":"10.1016/j.matchemphys.2025.130589","DOIUrl":"10.1016/j.matchemphys.2025.130589","url":null,"abstract":"<div><div>In order to improve bonding quality, a method of pre-bonding and second bonding based on Mo/Au metal adhesion layers was implemented to bond two semiconductor chips. After sputtering Mo/Au thin film on the substrates, two chips taken out from magnetron sputtering were first brought into contact with each other and applied to a pressure of 20 N, which is called pre-bonding. Then a pressure of 2000 N was applied to complete second bonding by using a wafer bonding machine. Pre-bonding and second bonding were both carried out at room temperature and atmospheric environment. The results indicate this method can significantly reduce void density, and a Mo/Au (10 nm/30 nm) nano-adhesion layer can achieve extremely low void density (0.3 %) after this bonding process, also, the original grain boundaries at Au/Au bonding interface have disappeared. While without pre-bonding, more bonding voids were found in the interface, with a minimum size of approximately 40 nm. And a nano-gap (∼2 nm) was clearly observed between the two bonding voids with transmission electron microscope, indicating that Au and Au bonding surfaces were not completely bonded together.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130589"},"PeriodicalIF":4.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526592","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}

引用次数: 0

Microstructure and tribological properties comparison of Cu–Ti2SnC composite and Cu–Ti2SnC-graphite composite

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-20 DOI: 10.1016/j.matchemphys.2025.130576

Jun Li , Yanlin Zhang , Zhenbao Chen , Hongming Wei , Jianpeng Zou

Cu–Ti₂SnC composite (CTC) is promising electrical contact materials known for its excellent electrical conductivity, thermal conductivity, mechanical properties, and wear resistance, which has attracted widespread research attention. However, the lubrication performance of CTC is inadequate. In this study, graphite was incorporated into CTC, and the effect of graphite on the microstructure and tribological properties was investigated. The results show that graphite promotes the decomposition of Ti₂SnC in the composites. Additionally, although the wear resistance of CTC slightly decreases after adding graphite, the lubrication performance is significantly enhanced. Specifically, the wear rate of CTC increases slightly from 1.76 × 10⁻⁵ mm³/N·m to 4.01 × 10⁻⁵ mm³/N·m, while the friction coefficient decreases significantly from approximately 0.45 to approximately 0.17 after the addition of graphite. Importantly, the addition of graphite to CTC does not cause significant wear to the counterpart.

{"title":"Microstructure and tribological properties comparison of Cu–Ti2SnC composite and Cu–Ti2SnC-graphite composite","authors":"Jun Li , Yanlin Zhang , Zhenbao Chen , Hongming Wei , Jianpeng Zou","doi":"10.1016/j.matchemphys.2025.130576","DOIUrl":"10.1016/j.matchemphys.2025.130576","url":null,"abstract":"<div><div>Cu–Ti<sub>2</sub>SnC composite (CTC) is promising electrical contact materials known for its excellent electrical conductivity, thermal conductivity, mechanical properties, and wear resistance, which has attracted widespread research attention. However, the lubrication performance of CTC is inadequate. In this study, graphite was incorporated into CTC, and the effect of graphite on the microstructure and tribological properties was investigated. The results show that graphite promotes the decomposition of Ti<sub>2</sub>SnC in the composites. Additionally, although the wear resistance of CTC slightly decreases after adding graphite, the lubrication performance is significantly enhanced. Specifically, the wear rate of CTC increases slightly from 1.76 × 10<sup>−5</sup> mm<sup>3</sup>/N·m to 4.01 × 10<sup>−5</sup> mm<sup>3</sup>/N·m, while the friction coefficient decreases significantly from approximately 0.45 to approximately 0.17 after the addition of graphite. Importantly, the addition of graphite to CTC does not cause significant wear to the counterpart.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130576"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478624","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}

引用次数: 0

Mechanochemical reaction and phase transformations in the α-Fe2O3/Mg mixture

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-20 DOI: 10.1016/j.matchemphys.2025.130570

Nedjoua Boutabia , Bouguerra Bouzabata , Safia Alleg , Joan-Jose Suñol , Jean-Marc Greneche

A two-step solid solution reaction was observed in a mechanically alloyed mixture of α-Fe₂O₃ and Mg powders under an argon atmosphere. The phase transformation, thermal stability, and magnetic properties were investigated using X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, ⁵⁷Fe Mössbauer spectrometry, and vibrating sample magnetometry. The reaction between α-Fe₂O₃ and Mg powders can be described in two stages. The first stage (1−10 h of milling) is characterised by forming a nanocomposite α-Fe/MgO via the oxidation/reduction reaction, where the saturation magnetisation, coercivity, and Fe-rich environments reach maximum values of 166 emu/g, 400 Oe, and 63.3 %, respectively. The second stage (20–30 h) is characterised by forming Fe(Mg) and (Mg, Fe)O supersaturated solid solutions accompanied by a decrease in the α-Fe weight fraction, saturation magnetisation, coercivity, and percentage of magnetic components. The average crystallite size ranges between 10 and 42 nm. The lattice parameter varies between 2.8694 and 2.8805 Å for the α-Fe and between 4.2194 and 4.2361 Å for the MgO. SEM observation showed particle agglomerates and significant changes in particle shape and size. Mössbauer spectrometry results reveal the presence of four components related to α-Fe and Fe(Mg) supersaturated solid solution and Fe²⁺ and Fe³⁺ ions in different locations in a MgO lattice. The DSC scans show 2 Ci temperatures at about 580 °C (3 h) and 586 °C (30 h).

{"title":"Mechanochemical reaction and phase transformations in the α-Fe2O3/Mg mixture","authors":"Nedjoua Boutabia , Bouguerra Bouzabata , Safia Alleg , Joan-Jose Suñol , Jean-Marc Greneche","doi":"10.1016/j.matchemphys.2025.130570","DOIUrl":"10.1016/j.matchemphys.2025.130570","url":null,"abstract":"<div><div>A two-step solid solution reaction was observed in a mechanically alloyed mixture of α-Fe<sub>2</sub>O<sub>3</sub> and Mg powders under an argon atmosphere. The phase transformation, thermal stability, and magnetic properties were investigated using X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, <sup>57</sup>Fe Mössbauer spectrometry, and vibrating sample magnetometry. The reaction between α-Fe<sub>2</sub>O<sub>3</sub> and Mg powders can be described in two stages. The first stage (1−10 h of milling) is characterised by forming a nanocomposite α-Fe/MgO via the oxidation/reduction reaction, where the saturation magnetisation, coercivity, and Fe-rich environments reach maximum values of 166 emu/g, 400 Oe, and 63.3 %, respectively. The second stage (20–30 h) is characterised by forming Fe(Mg) and (Mg, Fe)O supersaturated solid solutions accompanied by a decrease in the α-Fe weight fraction, saturation magnetisation, coercivity, and percentage of magnetic components. The average crystallite size ranges between 10 and 42 nm. The lattice parameter varies between 2.8694 and 2.8805 Å for the α-Fe and between 4.2194 and 4.2361 Å for the MgO. SEM observation showed particle agglomerates and significant changes in particle shape and size. Mössbauer spectrometry results reveal the presence of four components related to α-Fe and Fe(Mg) supersaturated solid solution and Fe<sup>2+</sup> and Fe<sup>3+</sup> ions in different locations in a MgO lattice. The DSC scans show 2 Ci temperatures at about 580 °C (3 h) and 586 °C (30 h).</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"337 ","pages":"Article 130570"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487616","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}

引用次数: 0

Property assessment of copper-doped SnO2 QDs and its use as ammonia sensor

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-20 DOI: 10.1016/j.matchemphys.2025.130578

Rahul Sonkar , Mritunjoy Prasad Ghosh , Samir Thakur , Eeshankur Saikia , Devasish Chowdhury

Development of ammonia sensors are very important as such technology will be needed to detect and monitor ammonia levels in various environments, contributing to safety, environmental protection, quality control, and regulatory compliance across a wide range of industries and applications. In this work, copper ions substituted SnO₂ quantum dots of different weight percentages were synthesized using the conventional co-precipitation method to test their ability for ammonia detection. The physical properties of all the prepared samples were investigated experimentally, and correlations were established between them. X-ray diffraction studies verified the formation of quantum dots, pure crystallographic phase, and complete dissolution of Cu ions in the host SnO₂ crystal structure. Sherrer's formula was utilized to evaluate the mean crystallite size of prepared quantum dots, which were found to be between 3.3 nm and 4.1 nm, respectively. Average particle sizes, obtained from HRTEM micrographs also supported the claim of quantum dots of prepared samples and were also found an excellent match with mean crystallite sizes. A red shift in absorption spectra was also observed with increasing Cu-content. Both the obtained XPS data and EDS spectra confirmed the presence of all elements in the synthesized quantum dots. A careful examination of the luminescence properties also supported the quantum size effects of the prepared samples. Weak ferromagnetic behavior was also noted in 6 % Cu-doped SnO₂ quantum dots at 300 K due to the p-d hybridization, which was further verified by the DFT study. Room temperature conductivity study revealed that the hopping of electrons was responsible for charge conduction. The incorporation of Cu ions made the SnO₂ quantum dots a lossy dielectric nanomaterial. Observed single semicircle in the Cole-Cole plot for all the samples confirmed that the grain boundaries contributed more efficiently in determining the dielectric properties of the systems. It was noted that 6 % of Cu-doped SnO₂ quantum dots detected ammonia at room temperature more efficiently and showed comparatively less response to other analytes. Therefore, these Cu-doped SnO₂ quantum dots have the potential to be used for ammonia sensing at room temperature.

氨气传感器的开发非常重要，因为需要这种技术来检测和监控各种环境中的氨气水平，从而促进各行各业和各种应用领域的安全、环境保护、质量控制和法规遵从。本研究采用传统共沉淀法合成了不同重量百分比的铜离子取代二氧化硒量子点，以测试其检测氨的能力。实验研究了所有制备样品的物理性质，并建立了它们之间的相关性。X 射线衍射研究验证了量子点的形成、纯晶相以及铜离子在主 SnO2 晶体结构中的完全溶解。利用 Sherrer 公式评估了所制备量子点的平均晶体尺寸，结果发现它们分别在 3.3 nm 和 4.1 nm 之间。从 HRTEM 显微照片中获得的平均粒径也证明了所制备样品的量子点，而且与平均晶粒尺寸非常吻合。随着铜含量的增加，还观察到吸收光谱发生了红移。获得的 XPS 数据和 EDS 光谱都证实了合成量子点中存在所有元素。对发光特性的仔细研究也证实了所制备样品的量子尺寸效应。由于 p-d 杂化作用，掺杂 6% 铜的 SnO2 量子点在 300 K 时也具有微弱的铁磁性，这一点在 DFT 研究中得到了进一步验证。室温传导性研究表明，电子的跳跃是电荷传导的原因。铜离子的加入使二氧化锡量子点成为一种有损电介质纳米材料。在所有样品的科尔-科尔图中观察到的单半圆证实，晶界在决定系统的介电性能方面做出了更有效的贡献。我们注意到，6% 的掺铜二氧化锡量子点在室温下检测氨的效率更高，而对其他分析物的反应相对较小。因此，这些掺铜二氧化锡量子点有望用于室温下的氨感应。

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引用次数: 0

Intrinsically peroxidase-mimicking RuO2–CNF nanozyme for colorimetric determination and monitoring of dopamine in PC12 cells

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-20 DOI: 10.1016/j.matchemphys.2025.130558

Bahareh Valinezhad Saghezi , Sonya Sharafipuor , Rahman Hallaj , Kamran Mansouri

This work presents a dual-functionality nanozyme with intrinsic peroxidase-like activity based on ruthenium oxide-modified carbon nanofibers (RuO₂–CNF). Electrospinning was employed as a simple and efficient method to produce modified CNF. These studies indicated that the colorimetric sensor system exhibited excellent intrinsic peroxidase-like activity in the presence of H₂O₂, leading to the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) and color change from colorless to blue. In this report, we also propose a strategy for the development of a colorimetric dopamine sensor for the selective determination of dopamine. Detailed studies demonstrate that dopamine significantly inhibits the activity of the prepared nanozyme. The color difference exhibits high sensitivity and increases linearly within the 5–35 μM dopamine concentration range. Under optimal conditions, the detection limit of the proposed sensor for dopamine was determined to be 0.36 μM. Our sensor, introduced by its simplicity and high reproducibility, provides a reliable tool for monitoring dopamine released from PC12 cells. Subsequently, upon the addition of dopamine hydrochloride, the solution's color changed from blue to colorless.

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引用次数: 0

Dielectric bionanocomposites with organoclay and silane-treated conductive fillers for reduced dielectric relaxation times

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2025-02-20 DOI: 10.1016/j.matchemphys.2025.130569

Hari Prashanth Palani Velayuda Shanmugasundram, Elammaran Jayamani, Kok Heng Soon

The effect of 3-Glycidyloxypropyl-trimethoxysilane (GPTMS) on aluminum nanoparticles incorporated into polylactic acid/polyhydroxyalkanoate/intercalated montmorillonite composite was investigated for its dielectric properties. The dielectric constant, losses and a. c conductivity of these composites were measured and a dielectric spectroscopy for studying the relaxation times (τ) was conducted. Scoped to address the reduction in dielectric relaxation times and charge dissipation, it was found that GPTMS treatment shifted the relaxation frequencies to much higher limits and stabilized the dielectric permittivity of the fabricated composite. At high frequencies of 1.75 MHz, two distinct relaxation times were calculated for varying loading of 5 wt%, 10 wt % and 15 wt % of silane-treated aluminum nanoparticles incorporated PLA/PHA/iMMT composites. The increase in a. c conductivity reveals the increased conduction in the insulative polymer matrix notably between 2.33 × 10⁻⁴ and 4.24 × 10⁻⁵ S/m. The argand plot for identifying dielectric relaxation phenomena, provided insights on polarization phenomena, regions of conduction, and most importantly a non-Debye type dielectric relaxation was observed with a reduction in τ values. This improvement would possibly affect the surface functionalization and coating techniques applied in polymer composite fabrication in the microelectronic applications.

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引用次数: 0