The accurate identification of dislocations in 4H-SiC is important. This study develops a stepwise micro-etching combined with X-ray topography (XRT) methodology for 4H-SiC that effectively overcoming the fundamental limitations of existing dislocation characterization methods. Multi-region quantitative analysis reveals that the misidentification rate between threading screw dislocation (TSD) and threading edge dislocation (TED) reaches approximately 30% when using conventional etch pit diameter measurements. Following stepwise micro-etching, XRT measurements reveals previously unobserved dual-contrast features, which originate from the size relationship between the etch pit inclination angle and the X-ray incident angle (θS/αmax). Multivariate analysis of grayscale values and projected areas enabled the discrimination between TSDs and TEDs with an overlap degree of less than 5%. The newly developed approach achieves precise density distribution mapping of TSD and TED in 4H-SiC substrates while minimizing etching damage to the material. This approach provides accurate dislocation identification, establishing new possibilities for the growth of low-dislocation-density crystals and the development of highly reliable SiC devices.
{"title":"Geometric-contrast-driven threading dislocations identification in 4H-SiC via synergistic micro-etching and X-ray topography","authors":"Kerui Chen, Jiangfeng Wang, Shan Yang, Guangzhao Li, Li Sun, Xuejian Xie, Xiufang Chen, Rongkun Wang, Xianglong Yang, Xiaobo Hu, Xiangang Xu","doi":"10.1016/j.mseb.2026.119282","DOIUrl":"10.1016/j.mseb.2026.119282","url":null,"abstract":"<div><div>The accurate identification of dislocations in 4H-SiC is important. This study develops a stepwise micro-etching combined with X-ray topography (XRT) methodology for 4H-SiC that effectively overcoming the fundamental limitations of existing dislocation characterization methods. Multi-region quantitative analysis reveals that the misidentification rate between threading screw dislocation (TSD) and threading edge dislocation (TED) reaches approximately 30% when using conventional etch pit diameter measurements. Following stepwise micro-etching, XRT measurements reveals previously unobserved dual-contrast features, which originate from the size relationship between the etch pit inclination angle and the X-ray incident angle (θ<sub>S</sub>/α<sub>max</sub>). Multivariate analysis of grayscale values and projected areas enabled the discrimination between TSDs and TEDs with an overlap degree of less than 5%. The newly developed approach achieves precise density distribution mapping of TSD and TED in 4H-SiC substrates while minimizing etching damage to the material. This approach provides accurate dislocation identification, establishing new possibilities for the growth of low-dislocation-density crystals and the development of highly reliable SiC devices.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119282"},"PeriodicalIF":4.6,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190518","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 : 2026-02-10DOI: 10.1016/j.mseb.2026.119277
Soad Z. Alsheheri , Mohamed Mokhtar M. Mostafa , Soliman I. El-Hout
The combustion of fuels containing sulfur can cause harmful consequences for human health, animal life, and ecosystems. To address this issue, desulfurization methods have been studied to produce fuels with extremely low sulfur content. Photocatalytic oxidative desulfurization, in particular, has gained significant interest due to its effectiveness and eco-friendly nature. However, this technique requires the use of high-performance nanostructured photocatalysts that possess an appropriate bandgap energy, a low rate of electron-hole recombination, and strong long-term stability. Bismuth molybdate (Bi2MoO6) shows excellent photocatalytic performance due to its visible-light response and good stability in water. In this work, mesoporous Bi2MoO6 nanostructures were prepared through a sol-gel/calcination method and modulated by adding narrow-bandgap Li2MnO3 nanoparticles (3.0–12.0 wt%). The photocatalytic activity under visible light was evaluated by performing oxidative desulfurization of thiophene as a model industrial sulfur compound. Adjustment of the weight content of Li2MnO3 and the catalyst loading, the complete oxidation of thiophene can be obtained with a kinetic rate constant of 0.02318 min−1, which is about 4.4 times than of that pure Bi2MoO6 in 135 min of irradiation. Moreover, the nanocomposite was highly stable and reusable in repeated runs, indicating its potential for large-scale applications. This work offers a general platform for application to the treatment of sulfur-containing waste and the solar-driven production of fine chemicals.
{"title":"Effective visible-light-driven oxidative desulfurization of thiophene over Li2MnO3-doped Bi2MoO6 heterojunction photocatalyst","authors":"Soad Z. Alsheheri , Mohamed Mokhtar M. Mostafa , Soliman I. El-Hout","doi":"10.1016/j.mseb.2026.119277","DOIUrl":"10.1016/j.mseb.2026.119277","url":null,"abstract":"<div><div>The combustion of fuels containing sulfur can cause harmful consequences for human health, animal life, and ecosystems. To address this issue, desulfurization methods have been studied to produce fuels with extremely low sulfur content. Photocatalytic oxidative desulfurization, in particular, has gained significant interest due to its effectiveness and eco-friendly nature. However, this technique requires the use of high-performance nanostructured photocatalysts that possess an appropriate bandgap energy, a low rate of electron-hole recombination, and strong long-term stability. Bismuth molybdate (Bi<sub>2</sub>MoO<sub>6</sub>) shows excellent photocatalytic performance due to its visible-light response and good stability in water. In this work, mesoporous Bi<sub>2</sub>MoO<sub>6</sub> nanostructures were prepared through a sol-gel/calcination method and modulated by adding narrow-bandgap Li<sub>2</sub>MnO<sub>3</sub> nanoparticles (3.0–12.0 wt%). The photocatalytic activity under visible light was evaluated by performing oxidative desulfurization of thiophene as a model industrial sulfur compound. Adjustment of the weight content of Li<sub>2</sub>MnO<sub>3</sub> and the catalyst loading, the complete oxidation of thiophene can be obtained with a kinetic rate constant of 0.02318 min<sup>−1</sup>, which is about 4.4 times than of that pure Bi<sub>2</sub>MoO<sub>6</sub> in 135 min of irradiation. Moreover, the nanocomposite was highly stable and reusable in repeated runs, indicating its potential for large-scale applications. This work offers a general platform for application to the treatment of sulfur-containing waste and the solar-driven production of fine chemicals.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119277"},"PeriodicalIF":4.6,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189928","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 : 2026-02-10DOI: 10.1016/j.mseb.2026.119273
Enyi He , Ruixiang Zhang , Shuqi Tan , Xicong Ye , Zhenyu He , Yu Cheng , Yongsheng Ye , Haihua Wu , Bo Song
Designing and preparing microwave absorbing materials with ultra-wideband and wide-angle absorption characteristics is key to solving electromagnetic pollution problems. This study, based on previously developed zinc ferrite hollow composite microspheres and reduced graphene oxide composite materials, employs 3D printing technology to prepare a filled gradient structure absorber and optimizes its structural parameters to achieve optimal absorption performance. Experimental results show that the prepared absorber, at a thickness of 9 mm, achieves an EAB of 11.8 GHz, covering the frequency ranges of 4.13–5.92 GHz and 7.99–18 GHz. It exhibits outstanding polarization insensitivity, demonstrating stable broadband, wide-angle absorption performance in both TE and TM polarization modes. The gradient structure design effectively improves impedance matching between the absorber and free space, facilitating the entry of electromagnetic waves. The synergistic effect of macroscopic boundary diffraction and microscopic absorption mechanisms further enhances the absorption performance. Additionally, by utilizing combinations of different absorbers and filling the gradient layers with the most suitable composite materials, the EAB of the absorber reaches 9.83 GHz at a physical thickness of 6 mm, with a minimum reflection loss of −46.46 dB. Compared to single-material absorber step-structure absorbers, the multi-material absorber step-structure absorber exhibits a 33% reduction in total thickness and a 61% decrease in volume, providing significant reference for the development of lightweight absorbers.
{"title":"Design and performance study of gradient structure microwave absorber based on rGO-ZnFe₂O₄ composite microspheres","authors":"Enyi He , Ruixiang Zhang , Shuqi Tan , Xicong Ye , Zhenyu He , Yu Cheng , Yongsheng Ye , Haihua Wu , Bo Song","doi":"10.1016/j.mseb.2026.119273","DOIUrl":"10.1016/j.mseb.2026.119273","url":null,"abstract":"<div><div>Designing and preparing microwave absorbing materials with ultra-wideband and wide-angle absorption characteristics is key to solving electromagnetic pollution problems. This study, based on previously developed zinc ferrite hollow composite microspheres and reduced graphene oxide composite materials, employs 3D printing technology to prepare a filled gradient structure absorber and optimizes its structural parameters to achieve optimal absorption performance. Experimental results show that the prepared absorber, at a thickness of 9 mm, achieves an EAB of 11.8 GHz, covering the frequency ranges of 4.13–5.92 GHz and 7.99–18 GHz. It exhibits outstanding polarization insensitivity, demonstrating stable broadband, wide-angle absorption performance in both TE and TM polarization modes. The gradient structure design effectively improves impedance matching between the absorber and free space, facilitating the entry of electromagnetic waves. The synergistic effect of macroscopic boundary diffraction and microscopic absorption mechanisms further enhances the absorption performance. Additionally, by utilizing combinations of different absorbers and filling the gradient layers with the most suitable composite materials, the EAB of the absorber reaches 9.83 GHz at a physical thickness of 6 mm, with a minimum reflection loss of −46.46 dB. Compared to single-material absorber step-structure absorbers, the multi-material absorber step-structure absorber exhibits a 33% reduction in total thickness and a 61% decrease in volume, providing significant reference for the development of lightweight absorbers.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119273"},"PeriodicalIF":4.6,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190561","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 : 2026-02-10DOI: 10.1016/j.mseb.2026.119252
G. Vinod , J. Prashanth , N. Harikumar , N. Suryam , Gajula Kiran , K. Sudhakar , B. Sreematha , Byru Venkatram Reddy , L. Naga Prasad , J. Laxman Naik
The current study used the citrate sol-gel auto-combustion method to fabricate Yb3+-doped Cu0.7Mg0.3Fe2O4 (Cu0.7Mg0.3Fe2-xYbxO4; x = 0.00, 0.004, 0.008, 0.012, 0.016, 0.020) ferrite nanoparticles. The P-XRD observations confirmed the presence of nano-spinel crystallites with sizes between 35.84 nm and 37.92 nm. According to FE-SEM and TEM data, Yb3+ doping improved grain dispersion and slightly increased grain size. All the FE-SEM micrographs showed spherical, well-structured, polycrystalline particles believed to consist of multiple grains. FT-IR measurements identify the two ferrite characteristic bands, υ1 (∼386–401 cm−1) and υ2 (∼510–574 cm−1). Additional Yb3+ doping decreased the optical band gap from 3.35 to 2.81 eV. As the temperature increases, the DC resistivity decreases in both the ferromagnetic and paramagnetic regions. CMYF nano-ferrites exhibit standard dielectric behaviour in terms of dielectric constant, dielectric loss, and AC conductivity. A lower loss tangent in Yb-doped CuMg nano-ferrite materials is beneficial for deflection coupling and high-frequency applications. Coercivity (Hc) increased, and saturation magnetisation (Ms) decreased in proportion to the addition of Rare-Earth Yb3+ ions. The highest coercivity (204.441 Oe) and the lowest saturation magnetisation (21.799 emu/g) of CMYF-5 make it suitable for high-frequency, microwave, and magnetic recording applications, as well as magnetoelectric composite applications, where magnetic stability and reduced loss are essential.
{"title":"Investigation of RE-Yb3+ doped CuMg nanoparticles via citrate sol-gel auto-combustion method for Magnetoelectric applications: Structural, optical, electrical and magnetic properties","authors":"G. Vinod , J. Prashanth , N. Harikumar , N. Suryam , Gajula Kiran , K. Sudhakar , B. Sreematha , Byru Venkatram Reddy , L. Naga Prasad , J. Laxman Naik","doi":"10.1016/j.mseb.2026.119252","DOIUrl":"10.1016/j.mseb.2026.119252","url":null,"abstract":"<div><div>The current study used the citrate sol-gel auto-combustion method to fabricate Yb<sup>3+</sup>-doped Cu<sub>0.7</sub>Mg<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> (Cu<sub>0.7</sub>Mg<sub>0.3</sub>Fe<sub>2-x</sub>Yb<sub>x</sub>O<sub>4</sub>; x = 0.00, 0.004, 0.008, 0.012, 0.016, 0.020) ferrite nanoparticles. The P-XRD observations confirmed the presence of nano-spinel crystallites with sizes between 35.84 nm and 37.92 nm. According to FE-SEM and TEM data, Yb<sup>3+</sup> doping improved grain dispersion and slightly increased grain size. All the FE-SEM micrographs showed spherical, well-structured, polycrystalline particles believed to consist of multiple grains. FT-IR measurements identify the two ferrite characteristic bands, υ<sub>1</sub> (∼386–401 cm<sup>−1</sup>) and υ<sub>2</sub> (∼510–574 cm<sup>−1</sup>). Additional Yb<sup>3+</sup> doping decreased the optical band gap from 3.35 to 2.81 eV. As the temperature increases, the DC resistivity decreases in both the ferromagnetic and paramagnetic regions. CMYF nano-ferrites exhibit standard dielectric behaviour in terms of dielectric constant, dielectric loss, and AC conductivity. A lower loss tangent in Yb-doped Cu<img>Mg nano-ferrite materials is beneficial for deflection coupling and high-frequency applications. Coercivity (Hc) increased, and saturation magnetisation (Ms) decreased in proportion to the addition of Rare-Earth Yb<sup>3+</sup> ions. The highest coercivity (204.441 Oe) and the lowest saturation magnetisation (21.799 emu/g) of CMYF-5 make it suitable for high-frequency, microwave, and magnetic recording applications, as well as magnetoelectric composite applications, where magnetic stability and reduced loss are essential.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119252"},"PeriodicalIF":4.6,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190392","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 : 2026-02-09DOI: 10.1016/j.mseb.2026.119283
Shahin Parveen , Nidhi Bhatt , Abdul Whab , Mohammad Moeen Hasan Raza , Vinod Erkkara Madhavan , Pumlianmunga
This work explores the effects of As2S3 doping on the structural, thermal, and electrical properties of Ge2Sb2Te5 (GST) thin films, aiming to enhance their suitability for phase change memory (PCM) applications. A series of As2S3-doped GST compositions are synthesized and analyzed using XRD, Raman spectroscopy, VIS-NIR spectroscopy, thermal and electrical measurements. The results indicate that As2S3 incorporation effectively suppresses crystallization, enhances amorphous phase stability, and improves thermal endurance. The 10-year data retention temperature increased from 78 °C (GST) to 106.7 °C at 21 at.% of As2S3. Electrical switching measurements showed a decrease in threshold current. Furthermore, COMSOL Multiphysics simulations revealed enhanced thermal confinement and more localized heating in the doped films, which directly influence power consumption. These findings suggest that As2S3-doped GST offers a promising direction toward high-performance and thermally stable PCM devices.
{"title":"Effects of As2S3 incorporation on the structural, optical and electrical properties of Ge2Sb2Te5 films for phase change memory","authors":"Shahin Parveen , Nidhi Bhatt , Abdul Whab , Mohammad Moeen Hasan Raza , Vinod Erkkara Madhavan , Pumlianmunga","doi":"10.1016/j.mseb.2026.119283","DOIUrl":"10.1016/j.mseb.2026.119283","url":null,"abstract":"<div><div>This work explores the effects of As<sub>2</sub>S<sub>3</sub> doping on the structural, thermal, and electrical properties of Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST) thin films, aiming to enhance their suitability for phase change memory (PCM) applications. A series of As<sub>2</sub>S<sub>3</sub>-doped GST compositions are synthesized and analyzed using XRD, Raman spectroscopy, VIS-NIR spectroscopy, thermal and electrical measurements. The results indicate that As<sub>2</sub>S<sub>3</sub> incorporation effectively suppresses crystallization, enhances amorphous phase stability, and improves thermal endurance. The 10-year data retention temperature increased from 78 °C (GST) to 106.7 °C at 21 at.% of As<sub>2</sub>S<sub>3</sub>. Electrical switching measurements showed a decrease in threshold current. Furthermore, COMSOL Multiphysics simulations revealed enhanced thermal confinement and more localized heating in the doped films, which directly influence power consumption. These findings suggest that As<sub>2</sub>S<sub>3</sub>-doped GST offers a promising direction toward high-performance and thermally stable PCM devices.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119283"},"PeriodicalIF":4.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190519","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 : 2026-02-09DOI: 10.1016/j.mseb.2026.119279
Harishchandra S. Nishad , Rajesh Jaiswar , Bhushan J. Ajgaonkar , Bhimarao M. Patil , Pravin S. Walke
The increasing universal demand for rapid energy storage solutions is driven by the requirement of superior power capability and prolonged lifespan in enormous applications, such as electric vehicles, regenerative braking, memory devices, and grid stabilization. However, electrochemical supercapacitors based on tungsten trioxide (WO3) nanomaterials, owing to their unique properties, effectively fulfil the demand of high-power output and longer life. Nevertheless, WO3 based negative electrodes face challenges involving limited electrical conductivity and degradation of structure during cycling. To address above limitations, the performance of nanomaterial significantly influenced by tuning of the crystal structure and morphology via well controlled synthesis, without extra-modifications. Here, we have investigated the modification of crystal structure and crystallinity of WO3 by regulating hydrothermal reaction times. We have prepared WO3·H2O and WO3 by a single step hydrothermal process at 3 h and 6 h respectively. The three electrode measurements of WO3·H2O and WO3 in 1 M H2SO4 aqueous electrolyte exhibits the specific capacitance of 43 F g−1 (WO3·H2O), and 74 F g−1 (WO3) at 2 A g−1 respectively. Additionally, the temperature dependent electrochemical performed of WO3 is estimated. Further, an asymmetric device using WO3 as negative and activate carbon as positive electrode showed a specific capacitance value of 21 F g−1 at a current density of 0.5 A g−1, maintaining 93% capacitance after 10,000 cycles at 100 mV s−1. The study demonstrates that reaction time plays a crucial role in controlling the structure and morphology of WO3 nanostructures for prospective energy storage applications.
在电动汽车、再生制动、存储设备和电网稳定等巨大应用中，对卓越功率能力和延长寿命的要求推动了对快速储能解决方案日益增长的普遍需求。然而，基于三氧化钨（WO3）纳米材料的电化学超级电容器由于其独特的性能，有效地满足了大功率输出和更长的使用寿命的需求。然而，WO3基负极在循环过程中面临着导电性有限和结构退化的挑战。为了解决上述限制，纳米材料的性能受到晶体结构和形貌调整的显著影响，通过良好的控制合成，而不需要额外的修饰。本文研究了通过调节水热反应时间对WO3晶体结构和结晶度的影响。采用单步水热法制备了WO3·H2O和WO3，反应时间分别为3h和6h。WO3·H2O和WO3在1 M H2SO4水溶液中的三种电极测量结果显示，在2 A g−1时，WO3·H2O和WO3的比电容分别为43 F g−1 （WO3·H2O）和74 F g−1 （WO3）。此外，还估计了WO3的温度依赖性电化学性能。此外，以WO3为负极，活性炭为正极的非对称器件在0.5 a g−1电流密度下的比电容值为21 F g−1，在100 mV s−1下循环10,000次后保持93%的电容。研究表明，反应时间在控制WO3纳米结构的结构和形态方面起着至关重要的作用，具有潜在的储能应用前景。
{"title":"Crystal phase and morphology tuning of tungsten oxide nanomaterials for robust asymmetric supercapacitor and its temperature-dependent electrochemical investigations","authors":"Harishchandra S. Nishad , Rajesh Jaiswar , Bhushan J. Ajgaonkar , Bhimarao M. Patil , Pravin S. Walke","doi":"10.1016/j.mseb.2026.119279","DOIUrl":"10.1016/j.mseb.2026.119279","url":null,"abstract":"<div><div>The increasing universal demand for rapid energy storage solutions is driven by the requirement of superior power capability and prolonged lifespan in enormous applications, such as electric vehicles, regenerative braking, memory devices, and grid stabilization. However, electrochemical supercapacitors based on tungsten trioxide (WO<sub>3</sub>) nanomaterials, owing to their unique properties, effectively fulfil the demand of high-power output and longer life. Nevertheless, WO<sub>3</sub> based negative electrodes face challenges involving limited electrical conductivity and degradation of structure during cycling. To address above limitations, the performance of nanomaterial significantly influenced by tuning of the crystal structure and morphology via well controlled synthesis, without extra-modifications. Here, we have investigated the modification of crystal structure and crystallinity of WO<sub>3</sub> by regulating hydrothermal reaction times. We have prepared WO<sub>3</sub>·H<sub>2</sub>O and WO<sub>3</sub> by a single step hydrothermal process at 3 h and 6 h respectively. The three electrode measurements of WO<sub>3</sub>·H<sub>2</sub>O and WO<sub>3</sub> in 1 M H<sub>2</sub>SO<sub>4</sub> aqueous electrolyte exhibits the specific capacitance of 43 F g<sup>−1</sup> (WO<sub>3</sub>·H<sub>2</sub>O), and 74 F g<sup>−1</sup> (WO<sub>3</sub>) at 2 A g<sup>−1</sup> respectively. Additionally, the temperature dependent electrochemical performed of WO<sub>3</sub> is estimated. Further, an asymmetric device using WO<sub>3</sub> as negative and activate carbon as positive electrode showed a specific capacitance value of 21 F g<sup>−1</sup> at a current density of 0.5 A g<sup>−1</sup>, maintaining 93% capacitance after 10,000 cycles at 100 mV s<sup>−1</sup>. The study demonstrates that reaction time plays a crucial role in controlling the structure and morphology of WO<sub>3</sub> nanostructures for prospective energy storage applications.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119279"},"PeriodicalIF":4.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190523","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 : 2026-02-09DOI: 10.1016/j.mseb.2026.119262
Isam M. Arafa, Mazin Y. Shatnawi, Zaid M. Al-Arqan
The research discusses methods to enhance silicon's thermoelectric properties through embedding two allotropic forms of sulfur and sodium sulfide into chemically etched nanoporous silicon. The etching of technical-grade silicon powder (SiPowder) was performed using an aqueous KOH/KF solution to yield hydrophilic/hydrophobic porous sites (p-Si). The porosity of p-Si was estimated by measuring the uptake of water and toluene at ambient conditions. These sites were extrinsically doped with linear and cyclic allotropes of elemental sulfur (S8), and sodium sulfide to yield Slinear: p-Si, Scyclic: p-Si, and Na2S: p-Si, respectively. The composition of the incorporated composites was examined by thermogravimetric analysis (TGA) in air, and their structural characteristics were investigated using P-XRD, ATR-IR, and SEM. The thermal, electrical, and thermoelectric (TE) properties (Seebeck coefficient, figure of merit, power factor) of these semiconductors were assessed as cold-pressed circular discs in the temperature range of 305 ≤ T ≤ 525. These inclusion composites exhibit ohmic semiconducting behavior, with thermal energy propagation via phonon lattice vibrations rather than electronic processes. Our findings reveal that the Na2S: p-Si and Slinear: p-Si composites exhibit significant ZT values of ≈ 0.24 and 0.16, respectively, rendering them highly promising for TE applications in small-scale waste heat recovery from sunshine and small domestic devices.
{"title":"Inclusion of SCyclic, SLinear, and Na2S into chemically etched porous silicon matrix: Thermoelectric studies","authors":"Isam M. Arafa, Mazin Y. Shatnawi, Zaid M. Al-Arqan","doi":"10.1016/j.mseb.2026.119262","DOIUrl":"10.1016/j.mseb.2026.119262","url":null,"abstract":"<div><div>The research discusses methods to enhance silicon's thermoelectric properties through embedding two allotropic forms of sulfur and sodium sulfide into chemically etched nanoporous silicon. The etching of technical-grade silicon powder (Si<sub>Powder</sub>) was performed using an aqueous KOH/KF solution to yield hydrophilic/hydrophobic porous sites (p-Si). The porosity of p-Si was estimated by measuring the uptake of water and toluene at ambient conditions. These sites were extrinsically doped with linear and cyclic allotropes of elemental sulfur (S<sub>8</sub>), and sodium sulfide to yield S<sub>linear</sub>: p-Si, S<sub>cyclic</sub>: p-Si, and Na<sub>2</sub>S: p-Si, respectively. The composition of the incorporated composites was examined by thermogravimetric analysis (TGA) in air, and their structural characteristics were investigated using P-XRD, ATR-IR, and SEM. The thermal, electrical, and thermoelectric (TE) properties (Seebeck coefficient, figure of merit, power factor) of these semiconductors were assessed as cold-pressed circular discs in the temperature range of 305 ≤ <em>T</em> ≤ 525. These inclusion composites exhibit ohmic semiconducting behavior, with thermal energy propagation via phonon lattice vibrations rather than electronic processes. Our findings reveal that the Na<sub>2</sub>S: p-Si and S<sub>linear</sub>: p-Si composites exhibit significant ZT values of ≈ 0.24 and 0.16, respectively, rendering them highly promising for TE applications in small-scale waste heat recovery from sunshine and small domestic devices.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119262"},"PeriodicalIF":4.6,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190393","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 : 2026-02-06DOI: 10.1016/j.mseb.2026.119256
Nishtha Sagta, P.V. Sada, Ajay Kumar Mishra
Transition metal-based electrodes are the forefront of advanced supercapacitor research due to their tunable redox activity and structural versatility. In this work, a binary composite tungsten disulfide/tungsten oxide (WS2/WO3-x) material was synthesized via an atmospheric pressure chemical vapor deposition (APCVD) technique and its application as a binder-free electrode for high-performance supercapacitors is studied. The as-synthesized WS2/WO3-x binary composite possesses a hierarchical flower-rod like morphology, resulting in combined electric double-layer and pseudocapacitive capacitance. A symmetric supercapacitor is assembled by coating WS2/WO3-x on a carbon cloth. The symmetric supercapacitor delivers an excellent specific capacitance of 380.8 F/g at 0.083 A/g with an energy density of 33.8 Wh/kg and power density of 133.3 W/kg. The electrode retains 84% of its initial capacitance after 2100 cycles at a current density of 2.6 A/g, underscoring its excellent cycling stability. Thus, these observed excellent electrochemical performances establish the WS2/WO3-x binary composite based electrodes, suggesting their tremendous potential as supercapacitor electrodes for energy storage systems.
过渡金属基电极由于其可调节的氧化还原活性和结构的多功能性而成为先进超级电容器研究的前沿。本文采用常压化学气相沉积（APCVD）技术合成了二硫化钨/氧化钨二元复合材料（WS2/WO3-x），并研究了其作为高性能超级电容器无粘结剂电极的应用。合成的WS2/WO3-x二元复合材料具有层叠的花棒状形貌，形成复合电双层和伪电容电容。通过在碳布上涂覆WS2/WO3-x来组装对称超级电容器。该对称超级电容器在0.083 A/g时具有380.8 F/g的比电容，能量密度为33.8 Wh/kg，功率密度为133.3 W/kg。在2.6 a /g的电流密度下，经过2100次循环后，电极保持了84%的初始电容，强调了其出色的循环稳定性。因此，这些观察到的优异电化学性能为WS2/WO3-x二元复合电极奠定了基础，表明其作为储能系统超级电容器电极的巨大潜力。
{"title":"Synthesis and electrochemical evaluation of WS2/WO3-x heterostructure for binder-free high-performance supercapacitors","authors":"Nishtha Sagta, P.V. Sada, Ajay Kumar Mishra","doi":"10.1016/j.mseb.2026.119256","DOIUrl":"10.1016/j.mseb.2026.119256","url":null,"abstract":"<div><div>Transition metal-based electrodes are the forefront of advanced supercapacitor research due to their tunable redox activity and structural versatility. In this work, a binary composite tungsten disulfide/tungsten oxide (WS<sub>2</sub>/WO<sub>3-x</sub>) material was synthesized via an atmospheric pressure chemical vapor deposition (APCVD) technique and its application as a binder-free electrode for high-performance supercapacitors is studied. The as-synthesized WS<sub>2</sub>/WO<sub>3-x</sub> binary composite possesses a hierarchical flower-rod like morphology, resulting in combined electric double-layer and pseudocapacitive capacitance. A symmetric supercapacitor is assembled by coating WS<sub>2</sub>/WO<sub>3-x</sub> on a carbon cloth. The symmetric supercapacitor delivers an excellent specific capacitance of 380.8 F/g at 0.083 A/g with an energy density of 33.8 Wh/kg and power density of 133.3 W/kg. The electrode retains 84% of its initial capacitance after 2100 cycles at a current density of 2.6 A/g, underscoring its excellent cycling stability. Thus, these observed excellent electrochemical performances establish the WS<sub>2</sub>/WO<sub>3-x</sub> binary composite based electrodes, suggesting their tremendous potential as supercapacitor electrodes for energy storage systems.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119256"},"PeriodicalIF":4.6,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190521","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 : 2026-02-06DOI: 10.1016/j.mseb.2026.119270
Linh Ho Thuy Nguyen , Vinh Phuoc Nguyen , Quyen Toan Pham , Binh Thien Pham , Thy Minh Ngoc Nguyen , Tan Le Hoang Doan
Functionalization of metal–organic frameworks (MOFs) with biopolymers provides an effective strategy to tailor interfacial chemistry while preserving framework integrity. In this study, UiO-66-NH2 was successfully functionalized with hyaluronic acid (HA) to form a hybrid composite, HA@UiO-66-NH2. Comprehensive structural, spectroscopic, and thermal analyses confirm that the crystalline framework of UiO-66-NH2 remains intact after HA incorporation, while polymer anchoring increases particle size and introduces a characteristic HA-related thermal decomposition step. HA functionalization slightly narrows the optical band gap (from 3.65 to 3.55 eV), indicating a modified electronic environment. Although partial pore occupation leads to a reduced N2 uptake, the CO2 adsorption capacity increases markedly from 1.5 to 2.5 mmol g1 at 273 K, accompanied by enhanced selectivity and more uniform adsorption energetics. In aqueous systems, HA@UiO-66-NH2 exhibits improved hydrophilicity, structural stability, and significantly enhanced tetracycline removal through a synergistic combination of adsorption and H2O2 assisted catalytic degradation.
{"title":"HA@UiO-66-NH2 hybrid composite: A water stable MOF for efficient CO2 uptake and antibiotic pollutant degradation","authors":"Linh Ho Thuy Nguyen , Vinh Phuoc Nguyen , Quyen Toan Pham , Binh Thien Pham , Thy Minh Ngoc Nguyen , Tan Le Hoang Doan","doi":"10.1016/j.mseb.2026.119270","DOIUrl":"10.1016/j.mseb.2026.119270","url":null,"abstract":"<div><div>Functionalization of metal–organic frameworks (MOFs) with biopolymers provides an effective strategy to tailor interfacial chemistry while preserving framework integrity. In this study, UiO-66-NH<sub>2</sub> was successfully functionalized with hyaluronic acid (HA) to form a hybrid composite, HA@UiO-66-NH<sub>2</sub>. Comprehensive structural, spectroscopic, and thermal analyses confirm that the crystalline framework of UiO-66-NH<sub>2</sub> remains intact after HA incorporation, while polymer anchoring increases particle size and introduces a characteristic HA-related thermal decomposition step. HA functionalization slightly narrows the optical band gap (from 3.65 to 3.55 eV), indicating a modified electronic environment. Although partial pore occupation leads to a reduced N<sub>2</sub> uptake, the CO<sub>2</sub> adsorption capacity increases markedly from 1.5 to 2.5 mmol g<sup>1</sup> at 273 K, accompanied by enhanced selectivity and more uniform adsorption energetics. In aqueous systems, HA@UiO-66-NH<sub>2</sub> exhibits improved hydrophilicity, structural stability, and significantly enhanced tetracycline removal through a synergistic combination of adsorption and H<sub>2</sub>O<sub>2</sub> assisted catalytic degradation.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119270"},"PeriodicalIF":4.6,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190520","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}
This study investigates the application of a nanocomposite photocatalyst consisting of ZnO tetrapod (ZnO-T) nanoparticles encapsulated in a poly[ε]caprolactone (PCL) matrix for the treatment of polluted water. ZnO-T nanoparticles were synthesized using a flame torch reactor and incorporated into PCL fibres by electrospinning. Characterization through SEM confirmed successful integration and particle distribution. Photocatalytic tests with Methylene blue under UV light illumination revealed that nanocomposites with 20–50% ZnO-T load reached 92% degradation efficiency, with a pseudo-first-order rate constant of up to k = 0.015 min−1, outperforming similar matrices loaded with commercial ZnO and TiO2 nanoparticles. The ZnO-T-PCL nanocomposites also demonstrated good stability retaining approximately 85% of their initial photocatalytic activity after 15 consecutive cycles with minimal Zn leaching, making them effective and durable for environmental applications.
{"title":"ZnO tetrapod/poly[ε]caprolactone fibre nanocomposite photocatalysts for water purification","authors":"Martynas Tichonovas , Emilija Mockutė , Deimantė Puzerė , Tadas Prasauskas , Dainius Martuzevičius , Tomas Tamulevičius , Domantas Peckus , Simas Račkauskas","doi":"10.1016/j.mseb.2026.119271","DOIUrl":"10.1016/j.mseb.2026.119271","url":null,"abstract":"<div><div>This study investigates the application of a nanocomposite photocatalyst consisting of ZnO tetrapod (ZnO-T) nanoparticles encapsulated in a poly[<em>ε</em>]caprolactone (PCL) matrix for the treatment of polluted water. ZnO-T nanoparticles were synthesized using a flame torch reactor and incorporated into PCL fibres by electrospinning. Characterization through SEM confirmed successful integration and particle distribution. Photocatalytic tests with Methylene blue under UV light illumination revealed that nanocomposites with 20–50% ZnO-T load reached 92% degradation efficiency, with a pseudo-first-order rate constant of up to k = 0.015 min<sup>−1</sup>, outperforming similar matrices loaded with commercial ZnO and TiO<sub>2</sub> nanoparticles. The ZnO-T-PCL nanocomposites also demonstrated good stability retaining approximately 85% of their initial photocatalytic activity after 15 consecutive cycles with minimal Zn leaching, making them effective and durable for environmental applications.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119271"},"PeriodicalIF":4.6,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190522","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号