Pub Date : 2026-05-01Epub 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":"2026-05-01","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}
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":"2026-05-01","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 : 2026-05-01Epub Date: 2026-01-30DOI: 10.1016/j.mseb.2026.119217
F. Mselmi , Souha Kammoun , M. Bessaoud , E. Dhahri , J. Pina , B.F.O. Costa
The Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 sample is synthesized using the solid-state reaction method. The Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 samples crystallize in a Pbnm space group with orthorhombic structure phase. Under λex = 377 nm, the PL spectrum of the Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 sample exhibit two intense red peaks at 693 nm and 726 nm assigned to 2T1(2G)→4A2(4F) and 2E(2G) → 4A2(4F) transitions of Cr3+. It also exhibits lines at 562 nm, (602 nm, 609 nm) and 647 nm are due to the transitions 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 of Sm3+[8]. A green emission band centered at 522 nm, 542 nm and 549 nm appear in the PL spectrum of the Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 under λex = 377 nm ascribed to the transitions 2H11/2 → 4I15/2, and 4S3/2 → 4I15/2 of Er3+ ions. The optical analysis indicates the presence of the energy transfer from Sm3+, Er3+, and intrinsic defects to Cr3+. This energy transfer enhances the far-red emission at 693 nm and 726 nm. The chromaticity (x, y) of the prepared phosphor Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 indicate that it suitable for use as luminescent material for plant growth LED application.
{"title":"Luminescence and energy transfer behavior in Gd0.985Er0.01Sm0.005Al0.995Cr0.005O3 for plant growth LED lighting","authors":"F. Mselmi , Souha Kammoun , M. Bessaoud , E. Dhahri , J. Pina , B.F.O. Costa","doi":"10.1016/j.mseb.2026.119217","DOIUrl":"10.1016/j.mseb.2026.119217","url":null,"abstract":"<div><div>The Gd<sub>0.985</sub>Er<sub>0.01</sub>Sm<sub>0.005</sub>Al<sub>0.995</sub>Cr<sub>0.005</sub>O<sub>3</sub> sample is synthesized using the solid-state reaction method. The Gd<sub>0.985</sub>Er<sub>0.01</sub>Sm<sub>0.005</sub>Al<sub>0.995</sub>Cr<sub>0.005</sub>O<sub>3</sub> samples crystallize in a Pbnm space group with orthorhombic structure phase. Under λ<sub>ex</sub> = 377 nm, the PL spectrum of the Gd<sub>0.985</sub>Er<sub>0.01</sub>Sm<sub>0.005</sub>Al<sub>0.995</sub>Cr<sub>0.005</sub>O<sub>3</sub> sample exhibit two intense red peaks at 693 nm and 726 nm assigned to <sup>2</sup>T<sub>1</sub>(<sup>2</sup>G)→<sup>4</sup>A<sub>2</sub>(<sup>4</sup>F) and <sup>2</sup>E(<sup>2</sup>G) → <sup>4</sup>A<sub>2</sub>(<sup>4</sup>F) transitions of Cr<sup>3+</sup>. It also exhibits lines at 562 nm, (602 nm, 609 nm) and 647 nm are due to the transitions <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>5/2</sub>, <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>7/2</sub> and <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>9/2</sub> of Sm<sup>3+</sup> <span><span>[8]</span></span>. A green emission band centered at 522 nm, 542 nm and 549 nm appear in the PL spectrum of the Gd<sub>0.985</sub>Er<sub>0.01</sub>Sm<sub>0.005</sub>Al<sub>0.995</sub>Cr<sub>0.005</sub>O<sub>3</sub> under λ<sub>ex</sub> = 377 nm ascribed to the transitions <sup>2</sup>H<sub>11/2</sub> → <sup>4</sup>I<sub>15/2</sub>, and <sup>4</sup>S<sub>3/2</sub> → <sup>4</sup>I<sub>15/2</sub> of Er<sup>3+</sup> ions. The optical analysis indicates the presence of the energy transfer from Sm<sup>3+</sup>, Er<sup>3+</sup>, and intrinsic defects to Cr<sup>3+</sup>. This energy transfer enhances the far-red emission at 693 nm and 726 nm. The chromaticity (x, y) of the prepared phosphor Gd<sub>0.985</sub>Er<sub>0.01</sub>Sm<sub>0.005</sub>Al<sub>0.995</sub>Cr<sub>0.005</sub>O<sub>3</sub> indicate that it suitable for use as luminescent material for plant growth LED application.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119217"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080935","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 : 2026-05-01Epub Date: 2026-01-29DOI: 10.1016/j.mseb.2026.119260
Yueyuan Gu , Juan Shi , Dilshod Nematov , Aoqi Liu , Yanru Yin , Hailu Dai , Lei Bi
Solid oxide fuel cells (SOFCs) are efficient energy conversion devices essential to clean energy development, yet their broad application is limited by material challenges, including sluggish oxygen reduction kinetics at intermediate temperatures, electrode instability and vulnerability to contaminants. High-entropy oxides, a novel class of materials characterized by multiple principal elements and high configurational entropy, present a promising approach to overcome these issues via their distinctive “four core effects”. This review begins with the fundamentals of high-entropy oxides, covering their definition, phase stabilization mechanisms, and relevant descriptors, then systematically reviews their progress as SOFC cathodes, electrolytes, and anodes. Key advances are summarized, and current challenges are analyzed, offering guidance for the design of high-performance and stable high-entropy oxides for SOFCs.
{"title":"A brief review of high-entropy oxides in solid oxide fuel cell applications","authors":"Yueyuan Gu , Juan Shi , Dilshod Nematov , Aoqi Liu , Yanru Yin , Hailu Dai , Lei Bi","doi":"10.1016/j.mseb.2026.119260","DOIUrl":"10.1016/j.mseb.2026.119260","url":null,"abstract":"<div><div>Solid oxide fuel cells (SOFCs) are efficient energy conversion devices essential to clean energy development, yet their broad application is limited by material challenges, including sluggish oxygen reduction kinetics at intermediate temperatures, electrode instability and vulnerability to contaminants. High-entropy oxides, a novel class of materials characterized by multiple principal elements and high configurational entropy, present a promising approach to overcome these issues via their distinctive “four core effects”. This review begins with the fundamentals of high-entropy oxides, covering their definition, phase stabilization mechanisms, and relevant descriptors, then systematically reviews their progress as SOFC cathodes, electrolytes, and anodes. Key advances are summarized, and current challenges are analyzed, offering guidance for the design of high-performance and stable high-entropy oxides for SOFCs.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119260"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080929","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 : 2026-05-01Epub Date: 2026-01-24DOI: 10.1016/j.mseb.2026.119232
Tianyuan Xiao , Xinyue Dong , Nan Yang , Yanming Zhang , Xiaoya Ding , Guangming Yin
To address the increasingly serious problem of antibiotic contamination, the hydrothermal method was employed to synthesize In2O3/α-Bi2O3 photocatalysts. For tetracycline (TC) in aqueous solution, its photocatalytic degradation efficiency driven by visible light was systematically evaluated. The physical structure, optical properties and charge transfer of the composite materials were characterized and analyzed by XRD, PL and EIS. Nanoparticles In2O3 was uniformly loaded on spindle-shaped α-Bi2O3, and the specific surface area increased to 17.08 m2/g. The composite material demonstrated a strong TC photodegradation ability, with a degradation efficiency of 86.99% (catalyst dosage = 30 mg, pH = 6, and initial TC concentration = 5 mg·L−1). The experimental results show that its excellent performance is attributed to the formation of heterojunctions, which have improved visible light absorption and efficient charge transfer. Free radical scavenger studies have confirmed that ·O₂− and h+ generated by photocatalysts account for the efficient degradation of TC, thus laying a foundation for the practical application of photocatalysts. This study innovatively constructs an In2O3/α-Bi2O3 heterojunction with tailored loading ratio, which not only extends the visible-light response range but also promotes directional charge transfer, thus achieving superior photocatalytic degradation of tetracycline.
{"title":"Synthesis of In2O3/α-Bi2O3 heterojunction composites for photocatalytic degradation of tetracycline","authors":"Tianyuan Xiao , Xinyue Dong , Nan Yang , Yanming Zhang , Xiaoya Ding , Guangming Yin","doi":"10.1016/j.mseb.2026.119232","DOIUrl":"10.1016/j.mseb.2026.119232","url":null,"abstract":"<div><div>To address the increasingly serious problem of antibiotic contamination, the hydrothermal method was employed to synthesize In<sub>2</sub>O<sub>3</sub>/α-Bi<sub>2</sub>O<sub>3</sub> photocatalysts. For tetracycline (TC) in aqueous solution, its photocatalytic degradation efficiency driven by visible light was systematically evaluated. The physical structure, optical properties and charge transfer of the composite materials were characterized and analyzed by XRD, PL and EIS. Nanoparticles In<sub>2</sub>O<sub>3</sub> was uniformly loaded on spindle-shaped α-Bi<sub>2</sub>O<sub>3</sub>, and the specific surface area increased to 17.08 m<sup>2</sup>/g. The composite material demonstrated a strong TC photodegradation ability, with a degradation efficiency of 86.99% (catalyst dosage = 30 mg, pH = 6, and initial TC concentration = 5 mg·L<sup>−1</sup>). The experimental results show that its excellent performance is attributed to the formation of heterojunctions, which have improved visible light absorption and efficient charge transfer. Free radical scavenger studies have confirmed that ·O₂<sup>−</sup> and h<sup>+</sup> generated by photocatalysts account for the efficient degradation of TC, thus laying a foundation for the practical application of photocatalysts. This study innovatively constructs an In<sub>2</sub>O<sub>3</sub>/α-Bi<sub>2</sub>O<sub>3</sub> heterojunction with tailored loading ratio, which not only extends the visible-light response range but also promotes directional charge transfer, thus achieving superior photocatalytic degradation of tetracycline.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119232"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080928","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 : 2026-05-01Epub Date: 2026-01-30DOI: 10.1016/j.mseb.2026.119209
Haiyong Cai, Ang Wang, Yin Li, Liguo Shang, Aiyun Jiang
Cobalt tetraoxide (Co3O4) is a highly promising functional material with significant potential in electrochromic electrode applications. In this study, Ni-doped Co3O4 nanostructured thin films were successfully prepared using a hydrothermal synthesis combined with high-temperature annealing process. Scanning electron microscopy (SEM) characterization revealed that the 1% Ni-doped sample exhibited a notably increased specific surface area, with its nanostructure showing a unique fibrous morphology. Electrochemical testing results demonstrated that the 1% Ni doping enhanced the OH− diffusion coefficient to 41.20 × 10−12 cm2/s, which is 3.97 times higher than that of pure Co3O4 (10.38 × 10−12 cm2/s). More importantly, the study found that Ni ions exhibited a unique reversible Ni2+/Ni3+ valence transition during the electrochromic process. This transition synergistically interacted with the Co2+/Co3+ valence state change, promoting a multi-electron transfer process. This work clarifies the synergistic effect of Ni ion valence transitions in the electrochromic process and provides new theoretical insights and technical solutions for designing high-performance electrochromic materials with multi-valence state synergy.
{"title":"Lattice engineering of nickel-doped cobalt tetraoxide nanofibers: Construction of multi-electron transfer channels and multi-valence electrochromic response","authors":"Haiyong Cai, Ang Wang, Yin Li, Liguo Shang, Aiyun Jiang","doi":"10.1016/j.mseb.2026.119209","DOIUrl":"10.1016/j.mseb.2026.119209","url":null,"abstract":"<div><div>Cobalt tetraoxide (Co<sub>3</sub>O<sub>4</sub>) is a highly promising functional material with significant potential in electrochromic electrode applications. In this study, Ni-doped Co<sub>3</sub>O<sub>4</sub> nanostructured thin films were successfully prepared using a hydrothermal synthesis combined with high-temperature annealing process. Scanning electron microscopy (SEM) characterization revealed that the 1% Ni-doped sample exhibited a notably increased specific surface area, with its nanostructure showing a unique fibrous morphology. Electrochemical testing results demonstrated that the 1% Ni doping enhanced the OH<sup>−</sup> diffusion coefficient to 41.20 × 10<sup>−12</sup> cm<sup>2</sup>/s, which is 3.97 times higher than that of pure Co<sub>3</sub>O<sub>4</sub> (10.38 × 10<sup>−12</sup> cm<sup>2</sup>/s). More importantly, the study found that Ni ions exhibited a unique reversible Ni<sup>2+</sup>/Ni<sup>3+</sup> valence transition during the electrochromic process. This transition synergistically interacted with the Co<sup>2+</sup>/Co<sup>3+</sup> valence state change, promoting a multi-electron transfer process. This work clarifies the synergistic effect of Ni ion valence transitions in the electrochromic process and provides new theoretical insights and technical solutions for designing high-performance electrochromic materials with multi-valence state synergy.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119209"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080916","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 : 2026-05-01Epub Date: 2026-01-23DOI: 10.1016/j.mseb.2026.119238
Ahmet Baran , Erdoğan Özel , Esra Evcin-Baydilli , Ahmet Kaymaz , Şemsettin Altındal
In this study, the temperature-dependent dielectric properties of a Cu-doped diamond-like carbon (DLC) interfacial-layered Schottky device (SD), fabricated by the electrochemical deposition method, were systematically investigated in terms of the dominant polarization mechanisms. Impedance measurements, performed over the temperature range of 80–410 K, were used to calculate the dielectric constant (ε'), dielectric loss (ε″), loss tangent (tan(δ)), ac conductivity (σac), and complex electric modulus (M⁎), including its real (M′) and imaginary (M″) components. The results reveal that all dielectric parameters exhibit three distinct behaviours within three temperature regions, namely low-temperature (LTs: 80–170 K), moderate-temperature (MTs: 200–290 K), and high-temperature (HTs: 300–410 K) regimes. This behavior indicates a pronounced sensitivity of the DLC interfacial layer to temperature. It was also observed that different polarization mechanisms, including dipolar, trapping-related, electronic, and space-charge polarizations, become dominant depending on the temperature and applied voltage range. Owing to the heterogeneous structure of the SD, the contribution of Maxwell–Wagner polarization, as a specific form of space-charge polarization, becomes particularly significant in the HTs region. Moreover, Cu doping leads to an increase in carrier density within the DLC layer, enhancing the tunneling probability and strengthening space-charge polarization through the increased availability of free carriers.
{"title":"Comprehensive dielectric analysis of Schottky devices with Cu-doped DLC interlayer: Temperature effects and polarization mechanisms","authors":"Ahmet Baran , Erdoğan Özel , Esra Evcin-Baydilli , Ahmet Kaymaz , Şemsettin Altındal","doi":"10.1016/j.mseb.2026.119238","DOIUrl":"10.1016/j.mseb.2026.119238","url":null,"abstract":"<div><div>In this study, the temperature-dependent dielectric properties of a Cu-doped diamond-like carbon (DLC) interfacial-layered Schottky device (SD), fabricated by the electrochemical deposition method, were systematically investigated in terms of the dominant polarization mechanisms. Impedance measurements, performed over the temperature range of 80–410 K, were used to calculate the dielectric constant (<em>ε'</em>), dielectric loss (<em>ε″</em>), loss tangent (<em>tan(δ)</em>), ac conductivity (<em>σ</em><sub><em>ac</em></sub>), and complex electric modulus (<em>M</em><sup><em>⁎</em></sup>), including its real (<em>M′</em>) and imaginary (<em>M″</em>) components. The results reveal that all dielectric parameters exhibit three distinct behaviours within three temperature regions, namely low-temperature (LTs: 80–170 K), moderate-temperature (MTs: 200–290 K), and high-temperature (HTs: 300–410 K) regimes. This behavior indicates a pronounced sensitivity of the DLC interfacial layer to temperature. It was also observed that different polarization mechanisms, including dipolar, trapping-related, electronic, and space-charge polarizations, become dominant depending on the temperature and applied voltage range. Owing to the heterogeneous structure of the SD, the contribution of Maxwell–Wagner polarization, as a specific form of space-charge polarization, becomes particularly significant in the HTs region. Moreover, Cu doping leads to an increase in carrier density within the DLC layer, enhancing the tunneling probability and strengthening space-charge polarization through the increased availability of free carriers.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119238"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037225","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 : 2026-05-01Epub Date: 2026-01-22DOI: 10.1016/j.mseb.2026.119214
Mateus Veras Pereira , Wilfredo Fernando Roque Villanueva , Evandro Datti , Wilson S. Fernandes-Junior , Bruno Campos Janegitz , Juliano Alves Bonacin
In recent years, antibiotics and other pharmaceutical compounds have been identified as emerging contaminants in aquatic ecosystems. Therefore, the detection of antibiotics in wastewater and other water bodies is crucial for monitoring the extent of contamination, assessing their potential impacts on human and environmental health, and developing effective strategies for their removal and control. In this study, we exploited additive manufacturing to design and fabricate an electroanalytical device (electrodes and electrochemical cell, using a polymeric matrix of polylactic acid and acrylonitrile-butadiene-styrene, respectively) for detecting sulfamethoxazole (SMX) in real water samples. The 3D-printed working electrode underwent an activation process. After activation, characterization using Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) revealed that the surface underwent modification, becoming more irregular and rougher, which contributed to better electrochemical activity. The electrochemical cell was applied to the detection of SMX, in a linear range of 0.5–50 μmol L−1. A good linear correlation was observed between the peak current and SMX concentration, as evidenced by the R2 value of 0.998, which confirmed a good fit of the data obtained. Furthermore, the limits of detection and quantification were 0.16 and 0.54 μmol L−1, respectively. The electrochemical system was applied to detect SMX in real water samples using square wave voltammetry (SWV) with the addition and recovery method. The recovery values obtained were 80.0 to 106%, indicating that the developed electrochemical system presented a satisfactory application for SMX detection. Therefore, the proposed electrochemical cell is an efficient alternative for antibiotic detection.
{"title":"3D-printed electrodes and electrochemical cell for sulfamethoxazole quantification","authors":"Mateus Veras Pereira , Wilfredo Fernando Roque Villanueva , Evandro Datti , Wilson S. Fernandes-Junior , Bruno Campos Janegitz , Juliano Alves Bonacin","doi":"10.1016/j.mseb.2026.119214","DOIUrl":"10.1016/j.mseb.2026.119214","url":null,"abstract":"<div><div>In recent years, antibiotics and other pharmaceutical compounds have been identified as emerging contaminants in aquatic ecosystems. Therefore, the detection of antibiotics in wastewater and other water bodies is crucial for monitoring the extent of contamination, assessing their potential impacts on human and environmental health, and developing effective strategies for their removal and control. In this study, we exploited additive manufacturing to design and fabricate an electroanalytical device (electrodes and electrochemical cell, using a polymeric matrix of polylactic acid and acrylonitrile-butadiene-styrene, respectively) for detecting sulfamethoxazole (SMX) in real water samples. The 3D-printed working electrode underwent an activation process. After activation, characterization using Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) revealed that the surface underwent modification, becoming more irregular and rougher, which contributed to better electrochemical activity. The electrochemical cell was applied to the detection of SMX, in a linear range of 0.5–50 μmol L<sup>−1</sup>. A good linear correlation was observed between the peak current and SMX concentration, as evidenced by the R<sup>2</sup> value of 0.998, which confirmed a good fit of the data obtained. Furthermore, the limits of detection and quantification were 0.16 and 0.54 μmol L<sup>−1</sup>, respectively. The electrochemical system was applied to detect SMX in real water samples using square wave voltammetry (SWV) with the addition and recovery method. The recovery values obtained were 80.0 to 106%, indicating that the developed electrochemical system presented a satisfactory application for SMX detection. Therefore, the proposed electrochemical cell is an efficient alternative for antibiotic detection.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119214"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037221","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 : 2026-05-01Epub Date: 2026-01-22DOI: 10.1016/j.mseb.2026.119235
Chen Wu , Yanli Liang , Jianqi Ma
The spinel magnetic material CuFe2O4 was prepared using the solvothermal method and subsequently modified with triaminopropyl trimethoxysilane (APTMS). A magnetic composite catalyst (CuFe2O4@NH2@Au) was synthesized by adsorbing 3 nm Au sol through the coordination adsorption of amino groups. For mechanistic comparison, the catalytic roles of bare CuFe2O4 and CuFe2O4@NH2 were individually investigated. The results demonstrate that Au nanoparticles were stably immobilized on the surface of CuFe2O4@NH2, forming a uniformly dispersed core-shell structure. CuFe2O4@NH2@Au adsorbs dyes (eosin and methyl orange) and BH4− on its surface, where it reduces the ester group in eosin to a hydroxyl group through the action of CuFe2O4 and the noble metal Au, and reduces the -N=N- bond in methyl orange to -NH-NH-. Remarkably, 95.7% of eosin and 98.1% of methyl orange were degraded within 15 min—a performance surpassing that of single-component systems. CuFe2O4@NH2@Au exhibited excellent reusability and stability in repeated batch experiments. This work establishes a magnetically recoverable platform for efficient treatment of complex dye wastewater.
{"title":"Synergistic catalysis in core-shell CuFe2O4@NH2@Au magnetic nanocomposites for enhanced degradation of organic dye wastewater","authors":"Chen Wu , Yanli Liang , Jianqi Ma","doi":"10.1016/j.mseb.2026.119235","DOIUrl":"10.1016/j.mseb.2026.119235","url":null,"abstract":"<div><div>The spinel magnetic material CuFe<sub>2</sub>O<sub>4</sub> was prepared using the solvothermal method and subsequently modified with triaminopropyl trimethoxysilane (APTMS). A magnetic composite catalyst (CuFe<sub>2</sub>O<sub>4</sub>@NH<sub>2</sub>@Au) was synthesized by adsorbing 3 nm Au sol through the coordination adsorption of amino groups. For mechanistic comparison, the catalytic roles of bare CuFe<sub>2</sub>O<sub>4</sub> and CuFe<sub>2</sub>O<sub>4</sub>@NH<sub>2</sub> were individually investigated. The results demonstrate that Au nanoparticles were stably immobilized on the surface of CuFe<sub>2</sub>O<sub>4</sub>@NH<sub>2</sub>, forming a uniformly dispersed core-shell structure. CuFe<sub>2</sub>O<sub>4</sub>@NH<sub>2</sub>@Au adsorbs dyes (eosin and methyl orange) and BH<sub>4</sub><sup>−</sup> on its surface, where it reduces the ester group in eosin to a hydroxyl group through the action of CuFe<sub>2</sub>O<sub>4</sub> and the noble metal Au, and reduces the -N=N- bond in methyl orange to -NH-NH-. Remarkably, 95.7% of eosin and 98.1% of methyl orange were degraded within 15 min—a performance surpassing that of single-component systems. CuFe<sub>2</sub>O<sub>4</sub>@NH<sub>2</sub>@Au exhibited excellent reusability and stability in repeated batch experiments. This work establishes a magnetically recoverable platform for efficient treatment of complex dye wastewater.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119235"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037222","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 : 2026-05-01Epub Date: 2026-01-22DOI: 10.1016/j.mseb.2026.119229
Feng Tong , Yi Zhu , Xiuquan Gu , Zheng Chen
Perovskite nanocrystals (PNCs) are promising luminescent materials for display applications owing to their exceptional optoelectronic characteristics. Nevertheless, their practical deployment is hindered by intrinsic high defect densities, which lead to insufficient photoluminescence quantum yields (PLQYs) and accelerated material degradation. In this study, a one-pot strategy was proposed by using nitrogen-doped graphene quantum dots (NGQDs) as surface ligands. Coupled with a polymethyl methacrylate (PMMA) coating, the NGQDs facilitate the formation of a robust composite architecture. Under optimized NGQD incorporation, the fabricated CsPbBr3/NGQDs/PMMA composite films display an ultra-narrow green emission peaked at 522 nm, with a full width at half maximum (FWHM) as narrow as 16 nm. More importantly, the composite exhibits significantly enhanced stability, maintaining 70% of its initial PL intensity after 7 days of water immersion or 1 h of thermal treatment at 100 °C. Such improvements are ascribed to effective defect passivation by the NGQDs and the beneficial role of their nitrogen-rich sites in promoting perovskite crystallization. As a demonstration of their potential, white light-emitting diodes (WLEDs) based on the composite realize a wide color gamut, covering 131% of the NTSC standard and 98% of the Rec. 2020 standard. This work thus proposes a novel one-pot in situ passivation approach, providing an effective route to concurrently address the efficiency and stability issues of PNCs.
{"title":"Passivation of CsPbBr3 nanocrystals with nitrogen-doped graphene quantum dots for white LEDs","authors":"Feng Tong , Yi Zhu , Xiuquan Gu , Zheng Chen","doi":"10.1016/j.mseb.2026.119229","DOIUrl":"10.1016/j.mseb.2026.119229","url":null,"abstract":"<div><div>Perovskite nanocrystals (PNCs) are promising luminescent materials for display applications owing to their exceptional optoelectronic characteristics. Nevertheless, their practical deployment is hindered by intrinsic high defect densities, which lead to insufficient photoluminescence quantum yields (PLQYs) and accelerated material degradation. In this study, a one-pot strategy was proposed by using nitrogen-doped graphene quantum dots (NGQDs) as surface ligands. Coupled with a polymethyl methacrylate (PMMA) coating, the NGQDs facilitate the formation of a robust composite architecture. Under optimized NGQD incorporation, the fabricated CsPbBr<sub>3</sub>/NGQDs/PMMA composite films display an ultra-narrow green emission peaked at 522 nm, with a full width at half maximum (FWHM) as narrow as 16 nm. More importantly, the composite exhibits significantly enhanced stability, maintaining 70% of its initial PL intensity after 7 days of water immersion or 1 h of thermal treatment at 100 °C. Such improvements are ascribed to effective defect passivation by the NGQDs and the beneficial role of their nitrogen-rich sites in promoting perovskite crystallization. As a demonstration of their potential, white light-emitting diodes (WLEDs) based on the composite realize a wide color gamut, covering 131% of the NTSC standard and 98% of the Rec. 2020 standard. This work thus proposes a novel one-pot <em>in situ</em> passivation approach, providing an effective route to concurrently address the efficiency and stability issues of PNCs.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"327 ","pages":"Article 119229"},"PeriodicalIF":4.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037290","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}
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