Pub Date : 2026-01-11DOI: 10.1016/j.matlet.2026.140101
Z.L. An , C.C. Du , B.R. Sun , T.D. Shen
The continuous cooling transformation (CCT) diagram for La-added 9Cr reduced activation ferritic-martensitic (RAFM) steels is studied, focusing on the critical transition temperatures and the evolution of austenite. The CCT diagrams were used to analyze phase transformations. The results indicate that La refines austenite grain size and accelerates ferrite transformation, thus optimizing the microstructures of RAFM steels.
{"title":"The influence of lanthanum on the phase transition behavior of 9Cr ferritic-martensitic steels","authors":"Z.L. An , C.C. Du , B.R. Sun , T.D. Shen","doi":"10.1016/j.matlet.2026.140101","DOIUrl":"10.1016/j.matlet.2026.140101","url":null,"abstract":"<div><div>The continuous cooling transformation (CCT) diagram for La-added 9Cr reduced activation ferritic-martensitic (RAFM) steels is studied, focusing on the critical transition temperatures and the evolution of austenite. The CCT diagrams were used to analyze phase transformations. The results indicate that La refines austenite grain size and accelerates ferrite transformation, thus optimizing the microstructures of RAFM steels.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140101"},"PeriodicalIF":2.7,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-11DOI: 10.1016/j.matlet.2026.140099
R. Poongodi , R. Gurupriya , K. Veeravelan , R. Manjula , K. Vijayalakshmi , Karuppiah Nagaraj , Renuka. Venkatachalapathy
Activated carbon generated from waste leather (ADCL) has been created as a sustainable adsorbent for the removal of the pharmaceutical contaminant etoricoxib from water. ADCL showed high adsorption capacity (22.22 mg g−1) and removal efficiency (97%), with pseudo-second-order kinetics and fitting Langmuir-Freundlich isotherm models. Thermodynamic studies revealed that the adsorption process is spontaneous and endothermic. FT-IR, XRD, and SEM investigations indicated several surface functional groups, a mostly amorphous carbon structure, and significant morphological changes upon adsorption. BET analysis revealed a high surface area (420 m2 g−1) and micro/mesoporous design, which improves adsorption effectiveness. Overall, waste-leather-derived activated carbon is a low-cost, ecologically friendly adsorbent for pharmaceutical wastewater treatment, as well as a valuable way to repurpose leather waste.
{"title":"Activated carbon from waste leather: A green adsorbent for pharmaceutical wastewater treatment","authors":"R. Poongodi , R. Gurupriya , K. Veeravelan , R. Manjula , K. Vijayalakshmi , Karuppiah Nagaraj , Renuka. Venkatachalapathy","doi":"10.1016/j.matlet.2026.140099","DOIUrl":"10.1016/j.matlet.2026.140099","url":null,"abstract":"<div><div>Activated carbon generated from waste leather (ADCL) has been created as a sustainable adsorbent for the removal of the pharmaceutical contaminant etoricoxib from water. ADCL showed high adsorption capacity (22.22 mg g<sup>−1</sup>) and removal efficiency (97%), with pseudo-second-order kinetics and fitting Langmuir-Freundlich isotherm models. Thermodynamic studies revealed that the adsorption process is spontaneous and endothermic. FT-IR, XRD, and SEM investigations indicated several surface functional groups, a mostly amorphous carbon structure, and significant morphological changes upon adsorption. BET analysis revealed a high surface area (420 m<sup>2</sup> g<sup>−1</sup>) and micro/mesoporous design, which improves adsorption effectiveness. Overall, waste-leather-derived activated carbon is a low-cost, ecologically friendly adsorbent for pharmaceutical wastewater treatment, as well as a valuable way to repurpose leather waste.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140099"},"PeriodicalIF":2.7,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-11DOI: 10.1016/j.matlet.2026.140095
S.R. Li , D.X. Wang , Y. Shi , H.F. Lei , X.W. Liu
This study evaluated the high temperature stability and oxidation behavior of a single-phase BCC VNbTa refractory multiple-principal element alloy (RMPEA). After isothermal annealing at 800 °C for 96 to 336 h, the alloy maintained a BCC single-phase solid solution structure, independent of the annealing time. The hardness curve first sharply decreases and then reaches a fluctuating platform. Noticeable annealing cracks propagate along the inter-dendritic regions, ascribed to undispersed thermal stress and significant stress concentration induced by the low diffusion rate of V. Furthermore, the alloy exhibits average oxidation rates of 0.209, 0.442 and 2.357 mg·cm−2·h−1 at 450, 550 and 650 °C for 4 h, respectively, indicating a rapid degradation of oxidation resistance with increasing temperature, which is linked to the severe micro-segregation of V. The present findings offer a pessimistic paradigm for the application of the BCC single phase RMPEA as a high temperature structural material.
{"title":"High temperature stability and oxidation resistance of a VNbTa refractory multiple-principal element alloy","authors":"S.R. Li , D.X. Wang , Y. Shi , H.F. Lei , X.W. Liu","doi":"10.1016/j.matlet.2026.140095","DOIUrl":"10.1016/j.matlet.2026.140095","url":null,"abstract":"<div><div>This study evaluated the high temperature stability and oxidation behavior of a single-phase BCC VNbTa refractory multiple-principal element alloy (RMPEA). After isothermal annealing at 800 °C for 96 to 336 h, the alloy maintained a BCC single-phase solid solution structure, independent of the annealing time. The hardness curve first sharply decreases and then reaches a fluctuating platform. Noticeable annealing cracks propagate along the inter-dendritic regions, ascribed to undispersed thermal stress and significant stress concentration induced by the low diffusion rate of V. Furthermore, the alloy exhibits average oxidation rates of 0.209, 0.442 and 2.357 mg·cm<sup>−2</sup>·h<sup>−1</sup> at 450, 550 and 650 °C for 4 h, respectively, indicating a rapid degradation of oxidation resistance with increasing temperature, which is linked to the severe micro-segregation of V. The present findings offer a pessimistic paradigm for the application of the BCC single phase RMPEA as a high temperature structural material.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140095"},"PeriodicalIF":2.7,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Calcium hydroxide (CH) remains widely used for pulp capping but presents limitations, including poor dentin adaptation and persistent inflammatory response. This study investigated a CH composite incorporating carbonate-hydroxyapatite (CHA) and ellagic acid (EA) to tune the setting behavior, ion-release profile, and pH stability. Five formulations with increasing CHA contents and a fixed EA concentration were evaluated. FTIR confirmed retention of characteristic hydroxyl, carbonate, and phosphate bands, indicating preserved functional chemistry with component interaction. Increasing CHA content prolonged setting time and reduced compressive strength, reflecting compositional tuning of handling and mechanical properties. All formulations maintained alkaline pH over 7 days, while sustained Ca2+ ion release, which decreased with reduced CH content. Overall, CHA-EA incorporation tunes the physicochemical characteristics of CH while maintaining its alkaline bioactive environment, supporting further biological evaluation as a tunable pulp-capping material.
{"title":"Tuning setting behavior, ion release, and pH stability of calcium hydroxide cement via carbonate-hydroxyapatite and ellagic acid","authors":"Novita , Intan Nirwana , Devi Rianti , Nurazreena Ahmad , Meircurius Dwi Condro Surboyo","doi":"10.1016/j.matlet.2026.140078","DOIUrl":"10.1016/j.matlet.2026.140078","url":null,"abstract":"<div><div>Calcium hydroxide (CH) remains widely used for pulp capping but presents limitations, including poor dentin adaptation and persistent inflammatory response. This study investigated a CH composite incorporating carbonate-hydroxyapatite (CHA) and ellagic acid (EA) to tune the setting behavior, ion-release profile, and pH stability. Five formulations with increasing CHA contents and a fixed EA concentration were evaluated. FTIR confirmed retention of characteristic hydroxyl, carbonate, and phosphate bands, indicating preserved functional chemistry with component interaction. Increasing CHA content prolonged setting time and reduced compressive strength, reflecting compositional tuning of handling and mechanical properties. All formulations maintained alkaline pH over 7 days, while sustained Ca<sup>2+</sup> ion release, which decreased with reduced CH content. Overall, CHA-EA incorporation tunes the physicochemical characteristics of CH while maintaining its alkaline bioactive environment, supporting further biological evaluation as a tunable pulp-capping material.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140078"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-10DOI: 10.1016/j.matlet.2026.140082
Lanfang Gong , Hanlan Liu , Ling Lan , Leyi Fu , Xiaojian Xu , Haichao Cui , Fenggui Lu
Hydrogen porosity is a critical defect in laser welding of Al-Mg alloys, as it severely deteriorates joint strength. This study systematically investigates the effect of ambient humidity on porosity formation. Welding experiments were conducted under different humidity conditions (50% with argon shielding, 50%, 60%, 70% and 80%). The results revealed a nonlinear dependence of porosity on humidity. At moderate humidity, higher initial concentration of dissolved atomic hydrogen was introduced into the molten pool, thereby promoting porosity, with the maximum pore number at 60% humidity. However, when enhancing to higher humidity, the condensed metal vapor above keyhole inlet significantly attenuated laser irradiation and generated shallower fusion zones. It accelerated solidification rate, which reduced time available for hydrogen diffusion and bubble growth. It increased the difficulty of achieving concentration threshold for hydrogen pore nucleation, resulting in fewer pores. The findings not only clarify the influence mechanism of humidity on hydrogen porosity but also provide a theoretical basis for optimizing laser welding quality of Al-Mg alloys under diverse climatic conditions.
{"title":"The effect of ambient humidity on hydrogen porosity formation during laser welding Al-Mg alloy","authors":"Lanfang Gong , Hanlan Liu , Ling Lan , Leyi Fu , Xiaojian Xu , Haichao Cui , Fenggui Lu","doi":"10.1016/j.matlet.2026.140082","DOIUrl":"10.1016/j.matlet.2026.140082","url":null,"abstract":"<div><div>Hydrogen porosity is a critical defect in laser welding of Al-Mg alloys, as it severely deteriorates joint strength. This study systematically investigates the effect of ambient humidity on porosity formation. Welding experiments were conducted under different humidity conditions (50% with argon shielding, 50%, 60%, 70% and 80%). The results revealed a nonlinear dependence of porosity on humidity. At moderate humidity, higher initial concentration of dissolved atomic hydrogen was introduced into the molten pool, thereby promoting porosity, with the maximum pore number at 60% humidity. However, when enhancing to higher humidity, the condensed metal vapor above keyhole inlet significantly attenuated laser irradiation and generated shallower fusion zones. It accelerated solidification rate, which reduced time available for hydrogen diffusion and bubble growth. It increased the difficulty of achieving concentration threshold for hydrogen pore nucleation, resulting in fewer pores. The findings not only clarify the influence mechanism of humidity on hydrogen porosity but also provide a theoretical basis for optimizing laser welding quality of Al-Mg alloys under diverse climatic conditions.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140082"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Herein, a novel fire-resistant piezoresistive sponge (denoted as Ni/APP@Sponge) is developed through a method involving the coating of nickel (Ni) and ammonium polyphosphate (APP) particles. Owing to the interaction between Ni and APP particles, the char residue of Ni/APP@Sponge reaches 39.65 wt% at 800 °C under an air atmosphere. Furthermore, benefiting from the microstructures of the conductive fabric and the high conductivity of Ni particles, the sensitivity of Ni/APP@Sponge is as high as 14.28 kPa−1 (5 kPa–11 kPa). The Ni/APP@Sponge can be arrayed in a layout to form a fire-resistant mattress, and the combination of software and hardware technology not only monitor sleep behaviors but also realize edge-hazard warnings. Therefore, this research offers a novel approach for advancing infant bedding toward higher safety and intelligent development.
{"title":"A novel fire-resistant piezoresistive sponge for monitoring infant sleep behaviors and realizing edge-hazard warnings","authors":"Xiangwen Gu, Haosen Xu, Ziqiang Xu, Xin Luo, Jinchen Liu, Yubao Cui, Tongqiang Shen","doi":"10.1016/j.matlet.2026.140093","DOIUrl":"10.1016/j.matlet.2026.140093","url":null,"abstract":"<div><div>Herein, a novel fire-resistant piezoresistive sponge (denoted as Ni/APP@Sponge) is developed through a method involving the coating of nickel (Ni) and ammonium polyphosphate (APP) particles. Owing to the interaction between Ni and APP particles, the char residue of Ni/APP@Sponge reaches 39.65 wt% at 800 °C under an air atmosphere. Furthermore, benefiting from the microstructures of the conductive fabric and the high conductivity of Ni particles, the sensitivity of Ni/APP@Sponge is as high as 14.28 kPa<sup>−1</sup> (5 kPa–11 kPa). The Ni/APP@Sponge can be arrayed in a layout to form a fire-resistant mattress, and the combination of software and hardware technology not only monitor sleep behaviors but also realize edge-hazard warnings. Therefore, this research offers a novel approach for advancing infant bedding toward higher safety and intelligent development.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140093"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-10DOI: 10.1016/j.matlet.2026.140091
Jinshuai Zheng , Jiayan Zhang , Ruitong Ma , Xiaoyue Li , Qiuju Zheng , Yanfei Zhang
Despite their high capacity, Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes are plagued by significant capacity fading due to interfacial and structural issues. Herein, we demonstrate a significant performance enhancement achieved by applying a ZIF-62 glass coating via a facile and economical mechanical grinding and sintering process. This coating simultaneously isolates the cathode from the electrolyte, suppressing deleterious reactions, while enhancing charge transfer kinetics due to its nitrogen-doped structure. The NCM811–450 electrode exhibits a significantly improved cycling stability, retaining 84.53% of its capacity after 200 cycles at 1C, markedly outperforming the uncoated NCM811, which retains only 48.55%. Structural characterization confirms the suppression of microcracks and superior structural integrity. This study highlights a simple and scalable ZIF-62 glass coating strategy for stabilizing Ni-rich cathodes, offering a promising pathway for high-energy-density lithium-ion batteries.
{"title":"ZIF-62 glass coating NCM811 cathodes: improving interface stability and long-term cycling performance","authors":"Jinshuai Zheng , Jiayan Zhang , Ruitong Ma , Xiaoyue Li , Qiuju Zheng , Yanfei Zhang","doi":"10.1016/j.matlet.2026.140091","DOIUrl":"10.1016/j.matlet.2026.140091","url":null,"abstract":"<div><div>Despite their high capacity, Ni-rich LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) cathodes are plagued by significant capacity fading due to interfacial and structural issues. Herein, we demonstrate a significant performance enhancement achieved by applying a ZIF-62 glass coating via a facile and economical mechanical grinding and sintering process. This coating simultaneously isolates the cathode from the electrolyte, suppressing deleterious reactions, while enhancing charge transfer kinetics due to its nitrogen-doped structure. The NCM811–450 electrode exhibits a significantly improved cycling stability, retaining 84.53% of its capacity after 200 cycles at 1C, markedly outperforming the uncoated NCM811, which retains only 48.55%. Structural characterization confirms the suppression of microcracks and superior structural integrity. This study highlights a simple and scalable ZIF-62 glass coating strategy for stabilizing Ni-rich cathodes, offering a promising pathway for high-energy-density lithium-ion batteries.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140091"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-10DOI: 10.1016/j.matlet.2026.140080
Haoyu Zeng , Wei Lin , Feifei Wang , Guobin Liang , Wenfei Wei
Organic small molecules (OSMs) offer high capacity and elemental sustainability for electrochemical applications but suffer from structural degradation and dissolution due to ion intercalation-induced volume expansion. This study leverages temperature-controlled hydrogel synthesis to modulate water content and physicochemical properties. By adjusting the fabrication temperature, two distinct hydrogels—a highly adherent hydrogel (HG-PSBMA) and a mechanically robust hydrogel (RG-PSBMA)—were produced from the same PSBMA-gelatin matrix. FT-IR, TGA, and Hirshfeld surface analysis confirmed that synthesis temperature dictates hydrogen-bonding networks via free/bound water distribution, influencing adhesion, mechanical strength, and swelling. When combined in a bilayer composite electrode (HG-PSBMA inner + RG-PSBMA outer), the dual-hydrogel system synergistically prevents OSM detachment and dissolution. This strategy highlights hydrogel confinement engineering for advanced organic electrodes.
{"title":"Temperature-modulated hydrogel properties enhance electrochemical stability of organic small molecules","authors":"Haoyu Zeng , Wei Lin , Feifei Wang , Guobin Liang , Wenfei Wei","doi":"10.1016/j.matlet.2026.140080","DOIUrl":"10.1016/j.matlet.2026.140080","url":null,"abstract":"<div><div>Organic small molecules (OSMs) offer high capacity and elemental sustainability for electrochemical applications but suffer from structural degradation and dissolution due to ion intercalation-induced volume expansion. This study leverages temperature-controlled hydrogel synthesis to modulate water content and physicochemical properties. By adjusting the fabrication temperature, two distinct hydrogels—a highly adherent hydrogel (HG-PSBMA) and a mechanically robust hydrogel (RG-PSBMA)—were produced from the same PSBMA-gelatin matrix. FT-IR, TGA, and Hirshfeld surface analysis confirmed that synthesis temperature dictates hydrogen-bonding networks via free/bound water distribution, influencing adhesion, mechanical strength, and swelling. When combined in a bilayer composite electrode (HG-PSBMA inner + RG-PSBMA outer), the dual-hydrogel system synergistically prevents OSM detachment and dissolution. This strategy highlights hydrogel confinement engineering for advanced organic electrodes.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140080"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-10DOI: 10.1016/j.matlet.2026.140079
Xinxin Yan, Si Chen, Can Jiang, Yunfei Zhang, Qiao Zhang, Hui Liu, Feipeng Du
Spin crossover (SCO) complexes hold immense potential for thermoelectric applications due to their temperature sensitivity. Herein, a kind of thermoelectric composite material based on SCO iron (II) complex [Fe(NH2trz)3](BF4)2 and single-walled carbon nanotubes (SWCNT) has been fabricated for advanced temperature sensing applications. When the mass ratio of SCO to SWCNTs is 3:20 and the temperature is 300 K, the composite has an electrical conductivity of 2033.1 ± 26.6 S cm−1 and a power factor of 144.4 ± 3.8 μW m−1 K−2. In contrast, pure SWCNTs only have an electrical conductivity of 1414.6 ± 22.5 S cm−1 and a power factor of 88.2 ± 4.2 μW m−1 K−2 at the same temperature. Moreover, the electrical conductivity of the composite changes more with temperature than that of pure SWCNTs when the temperature rises from 300 K to 400 K, which indicates that the composite is more sensitive to temperature. Therefore, a thermoelectric material with enhanced thermoelectric performance and temperature sensitivity has been successfully fabricated and has potential application in the field of temperature sensing.
自旋交叉（SCO）配合物由于其温度敏感性，在热电应用中具有巨大的潜力。本文制备了一种基于SCO铁（II）配合物[Fe(NH2trz)3](BF4)2和单壁碳纳米管（SWCNT）的热电复合材料，用于高级温度传感应用。当SCO与SWCNTs的质量比为3:20，温度为300 K时，复合材料的电导率为2033.1±26.6 S cm−1，功率因数为144.4±3.8 μW m−1 K−2。相比之下，在相同温度下，纯SWCNTs的电导率仅为1414.6±22.5 S cm−1，功率因数为88.2±4.2 μW m−1 K−2。此外，当温度从300 K升高到400 K时，复合材料的电导率随温度的变化比纯SWCNTs的电导率变化更大，这表明复合材料对温度更敏感。因此，成功制备了一种具有增强热电性能和温度敏感性的热电材料，并在温度传感领域具有潜在的应用前景。
{"title":"A novel thermoelectric composite material based on spin-crossover iron (II) complex","authors":"Xinxin Yan, Si Chen, Can Jiang, Yunfei Zhang, Qiao Zhang, Hui Liu, Feipeng Du","doi":"10.1016/j.matlet.2026.140079","DOIUrl":"10.1016/j.matlet.2026.140079","url":null,"abstract":"<div><div>Spin crossover (SCO) complexes hold immense potential for thermoelectric applications due to their temperature sensitivity. Herein, a kind of thermoelectric composite material based on SCO iron (II) complex [Fe(NH<sub>2</sub>trz)<sub>3</sub>](BF<sub>4</sub>)<sub>2</sub> and single-walled carbon nanotubes (SWCNT) has been fabricated for advanced temperature sensing applications. When the mass ratio of SCO to SWCNTs is 3:20 and the temperature is 300 K, the composite has an electrical conductivity of 2033.1 ± 26.6 S cm<sup>−1</sup> and a power factor of 144.4 ± 3.8 μW m<sup>−1</sup> K<sup>−2</sup>. In contrast, pure SWCNTs only have an electrical conductivity of 1414.6 ± 22.5 S cm<sup>−1</sup> and a power factor of 88.2 ± 4.2 μW m<sup>−1</sup> K<sup>−2</sup> at the same temperature. Moreover, the electrical conductivity of the composite changes more with temperature than that of pure SWCNTs when the temperature rises from 300 K to 400 K, which indicates that the composite is more sensitive to temperature. Therefore, a thermoelectric material with enhanced thermoelectric performance and temperature sensitivity has been successfully fabricated and has potential application in the field of temperature sensing.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140079"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2026-01-10DOI: 10.1016/j.matlet.2026.140089
Ecenaz Yaman , Sevval Sinem Dogan , Berat Bora Balikli , Mehmet Kurt , Tuluhan Olcayto Colak , Cigdem Tuc Altaf , Nurdan Demirci Sankir , Mehmet Sankir
Photoelectrochemical behavior of spray-pyrolyzed (MgNiCuCoZnFe)Ox high entropy compounds (HEC) is shown. The study revealed bare HEC had a higher anodic photocurrent density compared to the bare ZnO and heterojunction electrodes. However, the detectivity (2.7 × 1010 Jones) and sensitivity (275%) of the heterojunction electrodes were superior to bare HEC electrodes. FZO and ZnO layers have IPCE values below 10%, while the heterojunction has 83% at 367 nm and 63% at 382 nm. ABPE values of the heterojunction electrode were calculated for 382 nm, 367 nm, and AM1.5 light sources. The maximum ABPE at 382 nm, 367 nm, and AM1.5 light was 45.3% at 0.3 V, 58.33% at 0 V bias, and 1.22% at 0.5 V bias, respectively.
{"title":"A novel spray-pyrolyzed high-entropy electrode for efficient photoelectrochemical water splitting without bias potential","authors":"Ecenaz Yaman , Sevval Sinem Dogan , Berat Bora Balikli , Mehmet Kurt , Tuluhan Olcayto Colak , Cigdem Tuc Altaf , Nurdan Demirci Sankir , Mehmet Sankir","doi":"10.1016/j.matlet.2026.140089","DOIUrl":"10.1016/j.matlet.2026.140089","url":null,"abstract":"<div><div>Photoelectrochemical behavior of spray-pyrolyzed (MgNiCuCoZnFe)O<sub>x</sub> high entropy compounds (HEC) is shown. The study revealed bare HEC had a higher anodic photocurrent density compared to the bare ZnO and heterojunction electrodes. However, the detectivity (2.7 × 10<sup>10</sup> Jones) and sensitivity (275%) of the heterojunction electrodes were superior to bare HEC electrodes. FZO and ZnO layers have IPCE values below 10%, while the heterojunction has 83% at 367 nm and 63% at 382 nm. ABPE values of the heterojunction electrode were calculated for 382 nm, 367 nm, and AM1.5 light sources. The maximum ABPE at 382 nm, 367 nm, and AM1.5 light was 45.3% at 0.3 V, 58.33% at 0 V bias, and 1.22% at 0.5 V bias, respectively.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"407 ","pages":"Article 140089"},"PeriodicalIF":2.7,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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