Pub Date : 2026-04-01Epub Date: 2026-01-14DOI: 10.1016/j.matlet.2026.140110
Endong Zhang, Masashi Kato
Strontium titanate (SrTiO3) is a promising photocatalyst for solar water splitting, but carrier recombination limits its efficiency. Using time-resolved photoluminescence, we examined how Nb and La dopants affect recombination in SrTiO3 (100) crystals. Both introduce recombination centers, with La causing faster recombination due to more compensating defects such as oxygen vacancies or Ti3+. Increasing La concentration slightly increases lifetime by reducing these centers. Carrier lifetime decreases with temperature, consistent with Shockley-Read-Hall recombination. Rate-equation analysis shows La produces more recombination centers than Nb. These results clarify dopant roles and guide doping strategies to balance conductivity and lifetime for efficient hydrogen production.
{"title":"Difference in charge carrier recombination among undoped, Nb-, and La-doped SrTiO3 single crystals","authors":"Endong Zhang, Masashi Kato","doi":"10.1016/j.matlet.2026.140110","DOIUrl":"10.1016/j.matlet.2026.140110","url":null,"abstract":"<div><div>Strontium titanate (SrTiO<sub>3</sub>) is a promising photocatalyst for solar water splitting, but carrier recombination limits its efficiency. Using time-resolved photoluminescence, we examined how Nb and La dopants affect recombination in SrTiO<sub>3</sub> (100) crystals. Both introduce recombination centers, with La causing faster recombination due to more compensating defects such as oxygen vacancies or Ti<sup>3+</sup>. Increasing La concentration slightly increases lifetime by reducing these centers. Carrier lifetime decreases with temperature, consistent with Shockley-Read-Hall recombination. Rate-equation analysis shows La produces more recombination centers than Nb. These results clarify dopant roles and guide doping strategies to balance conductivity and lifetime for efficient hydrogen production.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140110"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976137","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 : 2026-04-01Epub Date: 2026-01-21DOI: 10.1016/j.matlet.2026.140152
Weiqin Tang , Zizheng Cao , Dayong Li , Yinghong Peng
The strength-ductility dilemma in metals can be addressed via gradient microstructures. In this study, tunable gradient structures were successfully fabricated in AZ31B magnesium alloy by exploiting the intrinsic strain gradient introduced by torsion across temperatures from room temperature to 300 °C. Processing of 20 mm-diameter rods was accomplished using a custom torsion system, giving rise to three unique regimes: a RT twin-density gradient, an intermediate 200 °C hybrid structure governed by twin-induced dynamic recrystallization (DRX), and a high-temperature 300 °C DRX-dominated grain size gradient. Detailed EBSD analysis uncovered the temperature-activated competition between twinning and recrystallization. This work establishes torsion processing as a powerful method for architecting gradients, paving the way for property enhancement in magnesium alloys.
{"title":"Temperature-dependent gradient structures in AZ31B magnesium alloy processed by torsion deformation","authors":"Weiqin Tang , Zizheng Cao , Dayong Li , Yinghong Peng","doi":"10.1016/j.matlet.2026.140152","DOIUrl":"10.1016/j.matlet.2026.140152","url":null,"abstract":"<div><div>The strength-ductility dilemma in metals can be addressed via gradient microstructures. In this study, tunable gradient structures were successfully fabricated in AZ31B magnesium alloy by exploiting the intrinsic strain gradient introduced by torsion across temperatures from room temperature to 300 °C. Processing of 20 mm-diameter rods was accomplished using a custom torsion system, giving rise to three unique regimes: a RT twin-density gradient, an intermediate 200 °C hybrid structure governed by twin-induced dynamic recrystallization (DRX), and a high-temperature 300 °C DRX-dominated grain size gradient. Detailed EBSD analysis uncovered the temperature-activated competition between twinning and recrystallization. This work establishes torsion processing as a powerful method for architecting gradients, paving the way for property enhancement in magnesium alloys.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140152"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075377","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 : 2026-04-01Epub Date: 2026-01-17DOI: 10.1016/j.matlet.2026.140126
Senthil Rethinam
Collagen nanoparticles (CNs) were developed using a desolvation method and were loaded with an anticancer drug (doxorubicin) for targeted oral cancer therapy. The CNs exhibited a uniform spherical morphology with particle sizes ranging from 98 to 180 nm, as confirmed by high-resolution scanning electron microscopy (HRSEM). The drug loading efficiency (DL) reached 12–13%, with an encapsulation efficiency (EE) of 78–80%, demonstrating strong drug retention within the collagen matrix. In vitro release studies demonstrated pH-responsive behavior, with cumulative release of 93% at pH 5.5 and 65% at pH 7.4 over 120 h, indicating enhanced drug liberation under tumor-like acidic conditions. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assays demonstrated a time-dependent reduction in oral cancer cell viability following treatment with drug-loaded collagen nanoparticles, with viability decreasing to 79% at 48 h and further to 53% at 72 h, indicating enhanced and sustained cytotoxicity compared to the free drug. Live/dead fluorescence imaging further confirmed the increased red fluorescence in the treated groups, indicating higher cell death. Overall, the results demonstrated that CNs provide efficient drug loading, sustained pH-sensitive release, and enhanced anticancer activity against oral cancer cells.
{"title":"Sustained and tumor-selective drug release from collagen nanocarriers for improved anticancer activity","authors":"Senthil Rethinam","doi":"10.1016/j.matlet.2026.140126","DOIUrl":"10.1016/j.matlet.2026.140126","url":null,"abstract":"<div><div>Collagen nanoparticles (CNs) were developed using a desolvation method and were loaded with an anticancer drug (doxorubicin) for targeted oral cancer therapy. The CNs exhibited a uniform spherical morphology with particle sizes ranging from 98 to 180 nm, as confirmed by high-resolution scanning electron microscopy (HRSEM). The drug loading efficiency (DL) reached 12–13%, with an encapsulation efficiency (EE) of 78–80%, demonstrating strong drug retention within the collagen matrix. In vitro release studies demonstrated pH-responsive behavior, with cumulative release of 93% at pH 5.5 and 65% at pH 7.4 over 120 h, indicating enhanced drug liberation under tumor-like acidic conditions. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assays demonstrated a time-dependent reduction in oral cancer cell viability following treatment with drug-loaded collagen nanoparticles, with viability decreasing to 79% at 48 h and further to 53% at 72 h, indicating enhanced and sustained cytotoxicity compared to the free drug. Live/dead fluorescence imaging further confirmed the increased red fluorescence in the treated groups, indicating higher cell death. Overall, the results demonstrated that CNs provide efficient drug loading, sustained pH-sensitive release, and enhanced anticancer activity against oral cancer cells.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140126"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025056","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}
In this study, silver nanoparticles were successfully deposited onto Bi2WO6 nanosheets through a facile hydrothermal synthesis route, producing Ag-decorated Bi2WO6 nanocomposites. The integration of Ag nanoparticles substantially improved the electrochemical behaviour. The optimized Ag/Bi2WO6 electrode exhibited an impressive specific capacitance of 1021.52 F/g, which is considerably higher than that of pristine Bi2WO6 (245.51 F/g) at 1 A/g in an electrolyte of 1 M KOH, and retained excellent cycling stability over 5000 continuous charge-discharge cycles with a capacitive retention of 87.3% at 10 A/g. The Ag/Bi2WO6 electrode exhibits an energy density of 22.7 Wh/kg at a power density of 206.05 W/kg. These outcomes confirm the strong synergistic interaction between Ag and Bi2WO6, establishing the composite as a promising electrode material for high-performance supercapacitor technologies.
在本研究中，通过简单的水热合成路线，成功地将银纳米颗粒沉积在Bi2WO6纳米片上，制备了银修饰的Bi2WO6纳米复合材料。银纳米颗粒的集成大大改善了电化学行为。优化后的Ag/Bi2WO6电极在1 M KOH的电解液中，比电容达到1021.52 F/g，大大高于原始Bi2WO6在1 A/g条件下的比电容245.51 F/g，在10 A/g条件下，在5000次连续充放电循环中保持了良好的循环稳定性，电容保持率为87.3%。Ag/Bi2WO6电极的能量密度为22.7 Wh/kg，功率密度为206.05 W/kg。这些结果证实了Ag和Bi2WO6之间的强协同相互作用，确立了该复合材料作为高性能超级电容器技术的有前途的电极材料。
{"title":"Revealing the enhanced electrochemical capabilities of 2D-Bi2WO6 for energy storage applications","authors":"Preety Yadav , Neeraj Dhariwal , Manju Kumari , Taro Ueda , Takeo Hyodo , Meenu Chahar , Poonam Jain , Yogesh Kumar , Anu Rana , Vinod Kumar , O.P. Thakur","doi":"10.1016/j.matlet.2026.140117","DOIUrl":"10.1016/j.matlet.2026.140117","url":null,"abstract":"<div><div>In this study, silver nanoparticles were successfully deposited onto Bi<sub>2</sub>WO<sub>6</sub> nanosheets through a facile hydrothermal synthesis route, producing Ag-decorated Bi<sub>2</sub>WO<sub>6</sub> nanocomposites. The integration of Ag nanoparticles substantially improved the electrochemical behaviour. The optimized Ag/Bi<sub>2</sub>WO<sub>6</sub> electrode exhibited an impressive specific capacitance of 1021.52 F/g, which is considerably higher than that of pristine Bi<sub>2</sub>WO<sub>6</sub> (245.51 F/g) at 1 A/g in an electrolyte of 1 M KOH, and retained excellent cycling stability over 5000 continuous charge-discharge cycles with a capacitive retention of 87.3% at 10 A/g. The Ag/Bi<sub>2</sub>WO<sub>6</sub> electrode exhibits an energy density of 22.7 Wh/kg at a power density of 206.05 W/kg. These outcomes confirm the strong synergistic interaction between Ag and Bi<sub>2</sub>WO<sub>6</sub>, establishing the composite as a promising electrode material for high-performance supercapacitor technologies.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140117"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025059","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 : 2026-04-01Epub Date: 2026-01-12DOI: 10.1016/j.matlet.2026.140107
Bingyan Ou , Daibo Zhu , Zhirui Liu , Weihao zhang , Canwei Zhang , Tan Han , Yang liu
This study investigates the effect of solution temperatures on the aged-state mechanical properties of 0.03 mm-diameter C17200 copper beryllium micro-wires. At 680 °C, fine grains, high-density grain boundaries, and residual undissolved γ phase yield higher initial tensile strength but restrict subsequent age-hardening. In contrast, 840 °C solution treatment forms a supersaturated solid solution (lower as-solution-treated strength); after aging, high-density nanoscale γ’ precipitates are uniformly distributed in the matrix, enabling significant precipitation strengthening and tensile strength approaching 1200 MPa. These findings show that for microscopic-scale CuBe micro-wires, the contribution of full precipitation strengthening to overall mechanical improvement exceeds that of grain boundary strengthening.
{"title":"Effect of solution treatment temperature on the mechanical properties of age-hardened C17200 CuBe micro-wires","authors":"Bingyan Ou , Daibo Zhu , Zhirui Liu , Weihao zhang , Canwei Zhang , Tan Han , Yang liu","doi":"10.1016/j.matlet.2026.140107","DOIUrl":"10.1016/j.matlet.2026.140107","url":null,"abstract":"<div><div>This study investigates the effect of solution temperatures on the aged-state mechanical properties of 0.03 mm-diameter C17200 copper beryllium micro-wires. At 680 °C, fine grains, high-density grain boundaries, and residual undissolved γ phase yield higher initial tensile strength but restrict subsequent age-hardening. In contrast, 840 °C solution treatment forms a supersaturated solid solution (lower as-solution-treated strength); after aging, high-density nanoscale γ’ precipitates are uniformly distributed in the matrix, enabling significant precipitation strengthening and tensile strength approaching 1200 MPa. These findings show that for microscopic-scale Cu<img>Be micro-wires, the contribution of full precipitation strengthening to overall mechanical improvement exceeds that of grain boundary strengthening.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140107"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025071","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 : 2026-04-01Epub Date: 2026-01-14DOI: 10.1016/j.matlet.2026.140094
Giovane Santos Duarte , Anne Carolinne Melo Costa , Helder de Lucena Pereira , Denise Nobrega Diniz , Marcelino Guedes Lima , Elvia Leal , Ana Cristina Figueiredo de Melo Costa
In this study, bismuth oxide (Bi2O3) was synthesized at a pilot scale by combustion reaction using urea and glycine as fuels, with the aim of its application as a radiopacifying agent in dental cements. The urea- and glycine-derived oxides are hereafter referred to as BiU and BiG. The oxide was incorporated into a carboxymethylcellulose–glycerin–water hydrogel (30 wt%), producing the cements CBU (cement containing BiU) and CBG (cement containing BiG). X-ray diffraction (XRD) confirmed the formation of the α-Bi2O3 phase for both routes. Scanning electron microscopy (SEM) micrographs showed that BiU consists of smaller, homogeneous, and porous particle agglomerates, whereas BiG consists of larger, heterogeneous agglomerates. The CBU exhibited higher density and radiopacity (8–9 mm Al), while the CBG showed lower radiopacity (7 mm Al) and higher flowability. The results demonstrate that the fuel type determines the Bi2O3 microstructure and, consequently, its radiopacity and flow behavior in the cements.
在本研究中，以尿素和甘氨酸为燃料，通过燃烧反应在中试规模下合成了氧化铋（Bi2O3），目的是将其用作牙科胶合剂中的放射性不透明剂。尿素和甘氨酸衍生的氧化物下文称为BiU和BiG。将氧化物掺入羧甲基纤维素-甘油-水凝胶（30% wt%）中，生成水泥CBU（含BiU的水泥）和CBG（含BiG的水泥）。x射线衍射（XRD）证实了两种途径均能形成α-Bi2O3相。扫描电镜（SEM）显微图显示，BiU由较小的、均匀的、多孔的颗粒团块组成，而BiG由较大的、非均匀的颗粒团块组成。CBU具有较高的密度和x射线透明度（8-9 mm Al），而CBG具有较低的x射线透明度（7 mm Al）和较高的流动性。结果表明，燃料类型决定了Bi2O3的微观结构，从而决定了其在胶结物中的放射性和流动行为。
{"title":"Dental cements containing Bi2O3: Physical properties and radiopacity","authors":"Giovane Santos Duarte , Anne Carolinne Melo Costa , Helder de Lucena Pereira , Denise Nobrega Diniz , Marcelino Guedes Lima , Elvia Leal , Ana Cristina Figueiredo de Melo Costa","doi":"10.1016/j.matlet.2026.140094","DOIUrl":"10.1016/j.matlet.2026.140094","url":null,"abstract":"<div><div>In this study, bismuth oxide (Bi<sub>2</sub>O<sub>3</sub>) was synthesized at a pilot scale by combustion reaction using urea and glycine as fuels, with the aim of its application as a radiopacifying agent in dental cements. The urea- and glycine-derived oxides are hereafter referred to as BiU and BiG. The oxide was incorporated into a carboxymethylcellulose–glycerin–water hydrogel (30 wt%), producing the cements CBU (cement containing BiU) and CBG (cement containing BiG). X-ray diffraction (XRD) confirmed the formation of the α-Bi<sub>2</sub>O<sub>3</sub> phase for both routes. Scanning electron microscopy (SEM) micrographs showed that BiU consists of smaller, homogeneous, and porous particle agglomerates, whereas BiG consists of larger, heterogeneous agglomerates. The CBU exhibited higher density and radiopacity (8–9 mm Al), while the CBG showed lower radiopacity (7 mm Al) and higher flowability. The results demonstrate that the fuel type determines the Bi<sub>2</sub>O<sub>3</sub> microstructure and, consequently, its radiopacity and flow behavior in the cements.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140094"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025248","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 : 2026-04-01Epub Date: 2026-01-21DOI: 10.1016/j.matlet.2026.140137
Amauri Serrano-Lázaro , Karina Portillo-Cortez , Citlali Sánchez Aké , Rosalba Castañeda-Guzmán , Ma. Beatriz de la Mora Mojica , Juan C. Durán-Álvarez
ZnO nanostructures are emerging as powerful platforms for optical biosensing; however, direct control over the relationship between morphology and sensing performance remains challenging. In this study, ZnO architectures were engineered via vapor–liquid–solid (VLS) growth using substrate-position control, leading to the formation of nanowires with branched tree-like morphologies and different optical signatures. Intense defect-related photoluminescence (PL) was systematically quenched upon adsorption of thiolated bovine serum albumin (BSA-thiol). After UV activation, submicromolar detection (0.6 μM) was achieved, placing this platform among the most sensitive label-free optical biosensors reported to date. A direct correlation between growth parameters, morphology, and biosensing efficiency was established, providing a strategy for tailoring ZnO surfaces for protein detection.
{"title":"Tailoring ZnO nanowire morphology by substrate-position-controlled VLS growth for label-free protein sensing","authors":"Amauri Serrano-Lázaro , Karina Portillo-Cortez , Citlali Sánchez Aké , Rosalba Castañeda-Guzmán , Ma. Beatriz de la Mora Mojica , Juan C. Durán-Álvarez","doi":"10.1016/j.matlet.2026.140137","DOIUrl":"10.1016/j.matlet.2026.140137","url":null,"abstract":"<div><div>ZnO nanostructures are emerging as powerful platforms for optical biosensing; however, direct control over the relationship between morphology and sensing performance remains challenging. In this study, ZnO architectures were engineered via vapor–liquid–solid (VLS) growth using substrate-position control, leading to the formation of nanowires with branched tree-like morphologies and different optical signatures. Intense defect-related photoluminescence (PL) was systematically quenched upon adsorption of thiolated bovine serum albumin (BSA-thiol). After UV activation, submicromolar detection (0.6 μM) was achieved, placing this platform among the most sensitive label-free optical biosensors reported to date. A direct correlation between growth parameters, morphology, and biosensing efficiency was established, providing a strategy for tailoring ZnO surfaces for protein detection.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140137"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025067","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}
Na4MnAl(PO4)3 is attractive for sodium-ion batteries due to abundant resources, low cost, and high theoretical energy density, but its low electronic conductivity, sluggish Na+ transport, and poor rate capability limit performance. Here, an in-situ N-doped carbon coating, formed by pyrolyzing polyvinylpyrrolidone (PVP) in a PVP-assisted sol–gel process, is applied to Na4MnAl(PO4)3 to enhance electronic conductivity and hence sodium storage. The optimal N-doped carbon coated Na4MnAl(PO4)3, 5% PVP–NMAP/C, shows higher capacity, better rate capability and cyclability than the pristine carbon-coated Na4MnAl(PO4)3. These results indicate that N-doped carbon coatings effectively boost the electrochemical performance of phosphate-based cathodes with low intrinsic electronic conductivity.
{"title":"High sodium storage performance of carbon coated Na4MnAl(PO4)3 cathode material prepared by PVP-assisted sol-gel method","authors":"Honghai Zhang, Jiaxin Ou, Wenqing Xu, Ye Sun, Yuchao He, Zongyi Wen, Yachun Lu, Jianwen Yang, Quanqi Chen","doi":"10.1016/j.matlet.2026.140132","DOIUrl":"10.1016/j.matlet.2026.140132","url":null,"abstract":"<div><div>Na<sub>4</sub>MnAl(PO<sub>4</sub>)<sub>3</sub> is attractive for sodium-ion batteries due to abundant resources, low cost, and high theoretical energy density, but its low electronic conductivity, sluggish Na<sup>+</sup> transport, and poor rate capability limit performance. Here, an in-situ N-doped carbon coating, formed by pyrolyzing polyvinylpyrrolidone (PVP) in a PVP-assisted sol–gel process, is applied to Na<sub>4</sub>MnAl(PO<sub>4</sub>)<sub>3</sub> to enhance electronic conductivity and hence sodium storage. The optimal N-doped carbon coated Na<sub>4</sub>MnAl(PO<sub>4</sub>)<sub>3</sub>, 5% PVP–NMAP/C, shows higher capacity, better rate capability and cyclability than the pristine carbon-coated Na<sub>4</sub>MnAl(PO<sub>4</sub>)<sub>3</sub>. These results indicate that N-doped carbon coatings effectively boost the electrochemical performance of phosphate-based cathodes with low intrinsic electronic conductivity.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140132"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025068","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 : 2026-04-01Epub Date: 2026-01-20DOI: 10.1016/j.matlet.2026.140135
Jian Liu , Shuo Zhang , Feiyue Hu , Zhouquan Wang , Longzhu Cai , Peigen Zhang , ZhengMing Sun
Impedance mismatch and single-mode attenuation often constrain the performance of microwave absorbers. Here, controlled Zn volatilization during thermal treatment of carbon nanofibers (CNF) composites induces a transition from Ni3ZnC0.7@CNF to Ni@CNF, concurrently generating dense heterointerfaces. At the optimal state (NZC-600), two-dimensional Ni3ZnC0.7 coupled with one-dimensional CNF to construct a three-dimensional multiscale network. This architecture integrates moderate permittivity, weak ferromagnetism, and heterointerface abundance, enabling complementary attenuation pathways with excellent impedance matching. Consequently, the composite achieves a minimum reflection loss of −59.9 dB and an effective absorption bandwidth of 8.68 GHz. These results significantly expand the application potential of Group VIII transition metal carbides in microwave absorption.
{"title":"Zn-volatilization-driven phase evolution to Ni3ZnC0.7@CNF multiscale heterostructures for ultrawideband and strong microwave absorption","authors":"Jian Liu , Shuo Zhang , Feiyue Hu , Zhouquan Wang , Longzhu Cai , Peigen Zhang , ZhengMing Sun","doi":"10.1016/j.matlet.2026.140135","DOIUrl":"10.1016/j.matlet.2026.140135","url":null,"abstract":"<div><div>Impedance mismatch and single-mode attenuation often constrain the performance of microwave absorbers. Here, controlled Zn volatilization during thermal treatment of carbon nanofibers (CNF) composites induces a transition from Ni<sub>3</sub>ZnC<sub>0.7</sub>@CNF to Ni@CNF, concurrently generating dense heterointerfaces. At the optimal state (NZC-600), two-dimensional Ni<sub>3</sub>ZnC<sub>0.7</sub> coupled with one-dimensional CNF to construct a three-dimensional multiscale network. This architecture integrates moderate permittivity, weak ferromagnetism, and heterointerface abundance, enabling complementary attenuation pathways with excellent impedance matching. Consequently, the composite achieves a minimum reflection loss of −59.9 dB and an effective absorption bandwidth of 8.68 GHz. These results significantly expand the application potential of Group VIII transition metal carbides in microwave absorption.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140135"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025070","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 : 2026-04-01Epub Date: 2026-01-15DOI: 10.1016/j.matlet.2026.140116
A. Thennarasi, Kuraganti Vasu
Here, the resistive switching behavior of defective MoSe2 2D nanosheets and 3D nanoflowers is investigated. The structural analysis reveals that the MoSe2 crystallized into a 2H hexagonal crystal structure and possesses Se vacancies. The memristor device with nanosheets (Au/MoSe2-S/Au) and nanoflower (Au/MoSe2-F/Au) exhibits bipolar asymmetric resistive switching. The nanoflower memristor shows a better switching performance with an ON/OFF ratio of 102 (at 1.5 V) and long cyclic stability.
{"title":"Asymmetric resistive switching behavior in defective MoSe2 nanostructures","authors":"A. Thennarasi, Kuraganti Vasu","doi":"10.1016/j.matlet.2026.140116","DOIUrl":"10.1016/j.matlet.2026.140116","url":null,"abstract":"<div><div>Here, the resistive switching behavior of defective MoSe<sub>2</sub> 2D nanosheets and 3D nanoflowers is investigated. The structural analysis reveals that the MoSe<sub>2</sub> crystallized into a 2H hexagonal crystal structure and possesses Se vacancies. The memristor device with nanosheets (Au/MoSe<sub>2</sub>-S/Au) and nanoflower (Au/MoSe<sub>2</sub>-F/Au) exhibits bipolar asymmetric resistive switching. The nanoflower memristor shows a better switching performance with an ON/OFF ratio of 10<sup>2</sup> (at 1.5 V) and long cyclic stability.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"408 ","pages":"Article 140116"},"PeriodicalIF":2.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025239","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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