Materials Research Bulletin最新文献

{"title":"Gas sensing performance of α-, α/β-, and β-Ga2O3 polymorphs","authors":"Nyepudzai C. Gatsi ,&nbsp;Murendeni I. Nemufulwi ,&nbsp;Gugu H. Mhlongo ,&nbsp;Nosipho Moloto ,&nbsp;Rudolph M. Erasmus ,&nbsp;Elizabeth Coetsee ,&nbsp;Hendrik C. Swart ,&nbsp;Odireleng M. Ntwaeaborwa","doi":"10.1016/j.materresbull.2025.113583","DOIUrl":"10.1016/j.materresbull.2025.113583","url":null,"abstract":"<div><div>This paper reports the detection of SO₂, NH₃, and CO gases using Ga₂O₃ polymorphs. The α-Ga₂O₃, α/β-Ga₂O₃, and β-Ga₂O₃ sensing materials were prepared using the hydrothermal method, followed by calcination at different temperatures ranging from 550 °C to 950 °C. The gas sensing properties were measured and analyzed based on the polymorphism-induced physicochemical properties of the sensing materials. Different Ga₂O₃ polymorphs showed distinct sensing properties, and factors contributing to this preferential gas detection behavior are discussed in detail. The proposed gas sensing mechanisms were discussed. Notably, the gas sensing performance of the α/β-Ga₂O₃-based sensor is reported here for the first time.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"192 ","pages":"Article 113583"},"PeriodicalIF":5.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195433","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}

{"title":"Crystal and electrical properties of polycrystalline In1−xGaxAs thin films directly formed on insulators","authors":"Koki Nozawa ,&nbsp;Seo Jisol ,&nbsp;Takamitsu Ishiyama ,&nbsp;Noriyuki Saitoh ,&nbsp;Noriko Yoshizawa ,&nbsp;Takashi Suemasu ,&nbsp;Kaoru Toko","doi":"10.1016/j.materresbull.2025.113581","DOIUrl":"10.1016/j.materresbull.2025.113581","url":null,"abstract":"<div><div>Polycrystalline In₁₋<em>_x</em>Ga<em>_x</em>As thin films are promising for high-performance electronics on versatile substrates, including transistors, solar cells, optical communication devices, and infrared sensors. This study examines the effects of composition, deposition temperature, and impurity doping on the grain size, crystal orientation, nanostructure, and electrical properties of In₁₋<em>_x</em>Ga<em>_x</em>As layers, utilizing various evaluation methods with machine learning. The results demonstrate that the composition and deposition temperature significantly influence the crystallinity and crystal orientations. Higher In compositions and deposition temperatures yield In₁₋<em>_x</em>Ga<em>_x</em>As with enhanced crystallinity. The undoped samples exhibit n-type conduction, which is likely attributable to antisite defects. Increasing the In content and deposition temperature increases the electron concentration and mobility up to 3 × 10¹⁸ cm⁻³ and 310 cm² V⁻¹s⁻¹, respectively. Sn is an effective n-type dopant, facilitating the control of electron concentration within the range of 10¹⁷–10¹⁹ cm⁻³. These findings offer valuable insights into the application of In₁₋<em>_x</em>Ga<em>_x</em>As in high-performance electronic devices.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"191 ","pages":"Article 113581"},"PeriodicalIF":5.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166528","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}

{"title":"Facile fabrication of p-Si/κ-In2Se3 heterojunction and investigation of photodetector performance under red and blue light","authors":"Emin Bacaksız ,&nbsp;Şakir Aydoğan","doi":"10.1016/j.materresbull.2025.113579","DOIUrl":"10.1016/j.materresbull.2025.113579","url":null,"abstract":"<div><div>κ-In₂Se₃ film was coated on p-Si by electron beam method. SEM, transmittance, EDS and optical absorption analyses of the film were performed. Photodetection performances of the p-Si/κ-In₂Se₃ device were evaluated upon various light irradiations of blue (443 nm) and red light (625 nm). A very high rectifying ratio of 3.2 × 10⁵ was obtained in the dark (at ± 3.0 V). For 14 mW/cm², the optimum values of ON/OFF ratio, responsivity, external quantum efficiency and specific detectivity were 469, 643 mA/W, ∼87 % and 8.21 × 10¹² for red light and 597, 82.8 mA/W, ∼16 % and 1.04 × 10¹¹ Jones for blue light, respectively. In the analysis of the response time, there was no regular change with increasing light intensity, with rise and fall times on the order of milliseconds, and these times were relatively lower in blue light than in red light. The device design and experimental results may be promising for photodetectors at different wavelengths.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"192 ","pages":"Article 113579"},"PeriodicalIF":5.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280342","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}

{"title":"Synthesis of novel EDTA-modified aluminum oxide for improved removal of heavy metal in contaminated water","authors":"Van Doan Nguyen,&nbsp;Anh-Tuan Vu","doi":"10.1016/j.materresbull.2025.113578","DOIUrl":"10.1016/j.materresbull.2025.113578","url":null,"abstract":"<div><div>In this study, Al₂O₃ with a large surface area and a porous structure was chemically modified by ethylenediaminetetraacetic acid (EDTA) using the biopolymer poly(vinyl alcohol) (PVA) as a binder to prepare the novel Al₂O₃/PVA-EDTA nanocomposite for enhanced Pb²⁺ adsorption. The Pb²⁺ removal reached a steady state within the initial 10 min. Under optimal conditions, the removal efficiency and sorption capacity were 87.34 % and 209.61 mg/g with a rate constant of 0.005 g.mg^-1.min^-1. The adsorption was most compatible with the Langmuir isotherm with q_max of 467.29 mg/g. The influence of other ions such as Cu²⁺, Cd²⁺, Fe³⁺, and Ni²⁺ on the removal efficiency was also examined. The Pb²⁺ removal mechanism was involved in electrostatic interactions, coordinative bonding, and complexation with EDTA, which was confirmed by FT-IR analysis. Moreover, the Pb²⁺ ions were effectively re-adsorbed onto the adsorbent after the 5^th cycle, corresponding to 97.65 % for the first cycle.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"192 ","pages":"Article 113578"},"PeriodicalIF":5.3,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178393","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}

{"title":"A stable photoanode tailored by mesosphere TiO2 decorated SnO2 nanobeads exceeding power conversion efficiency of 9.09 % through Fermi energy modulation impacting on electron transport","authors":"S. Athithya ,&nbsp;K. Gunasekaran ,&nbsp;S. Kamalakannan ,&nbsp;S. Muthu Mariappan ,&nbsp;S. Harish ,&nbsp;M. Navaneethan ,&nbsp;H. Ikeda ,&nbsp;J. Archana","doi":"10.1016/j.materresbull.2025.113564","DOIUrl":"10.1016/j.materresbull.2025.113564","url":null,"abstract":"<div><div>The conventional TiO₂ charge extraction layers are used as photoanodes of dye sensitized solar cells (DSSC) and often encounter large electron-hole pair recombination due to the low carrier mobility. Hence, it is highly required to enhance the transport properties of TiO₂ to improve the photo conversion efficiency (PCE) of DSSC. Focusing on this issue, we prepare TiO₂/SnO₂ nanocomposite (with different weight percentages of SnO₂) as a charge extraction layer and study the performance of the fabricated DSSC. The DSSC device fabricated with TiO₂/SnO₂ photoanode attains a maximum PCE of 9.09 % along with a current density (J_SC) of 19.02 mA/cm². Meanwhile, the TiO₂ mesosphere photoanode-based DSSC device exhibits a PCE of 4.31 % with a current density of 10.10 mA/cm². Furthermore, the first-principles calculation reveals the most stable configuration of the system and the interactions between TiO₂ and SnO₂. Also, Bader charge analyses are performed to quantify the charge transferred between TiO₂ and SnO₂. To the best of our knowledge, the PCE reported in this work is the highest for the TiO₂/SnO₂ photoanode-based DSSC of this kind.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"192 ","pages":"Article 113564"},"PeriodicalIF":5.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222097","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}

{"title":"Sintering atmosphere modulated defect engineering in Na0.4K0.1Bi0.5TiO3-based relaxor ceramics toward temperature-stable energy storage","authors":"Yu Qiu ,&nbsp;Jiangbo Cao ,&nbsp;Jiaze Wang ,&nbsp;Rong Ma ,&nbsp;Yating Yu ,&nbsp;Xiaoting Zhang","doi":"10.1016/j.materresbull.2025.113563","DOIUrl":"10.1016/j.materresbull.2025.113563","url":null,"abstract":"<div><div>Due to their rapid charge-discharge rates and high power density, dielectric ceramic materials exhibit significant application potential in pulsed power electronic systems. However, the inevitable compositional deviations and defect formation in ceramics during high-temperature sintering hinder further enhancement of their energy storage properties. In this paper, sintering atmosphere modulated defect engineering was adopted in Na_0.4K_0.1Bi_0.5TiO₃-based relaxor ceramics, so as to manipulate the defect form and their content toward temperature-stable energy storage. Results have verified that, defects engineering including oxygen vacancies and defect dipole could distinctly improve the breakdown strength and reduce the hysteresis loss, and modify the polarization switching behavior via the strengthened nanodomain induced relaxor feature. Ceramics sintered in a pure oxygen atmosphere achieve high <em>W</em>_rec of 3.66 J/cm³ and <em>η</em> of 91.7 %, along with wide dielectric temperature stability within 30–411 °C. This work provides an effective strategy to develop outstanding dielectric ceramics both in energy storage and temperature stability via defect engineering.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"191 ","pages":"Article 113563"},"PeriodicalIF":5.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131304","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}

{"title":"Investigations on photoluminescence properties, quantum and Judd-Ofelt analysis of novel NaSrY(BO3)2:Eu3+ phosphor for lighting applications","authors":"C.M. Nandanwar ,&nbsp;A.N. Yerpude ,&nbsp;M.A. Patwardhan ,&nbsp;N.S. Kokode ,&nbsp;R.L. Kohale","doi":"10.1016/j.materresbull.2025.113562","DOIUrl":"10.1016/j.materresbull.2025.113562","url":null,"abstract":"<div><div>The Eu³⁺-doped NaSrY(BO₃)₂ phosphor was synthesized using a combustion technique, and its photoluminescence properties were systematically investigated through decay time measurements, color purity analysis, X-ray diffraction (XRD), quantum efficiency determination, Judd-Ofelt analysis, and near-ultraviolet (n-UV) excitation studies. Upon excitation at 395 nm, the phosphor exhibited intense emission peaks at 595 nm, 615 nm, and 654 nm, corresponding to the characteristic transitions of Eu³⁺ ions. Judd-Ofelt analysis of the emission spectra revealed the intensity parameter trend Ω₂ &gt; Ω₄, indicating a strong electric dipole contribution and a highly asymmetric local environment around Eu³⁺ ions. The radiative properties, including radiative lifetime (τ_r), experimental lifetime (τ), and quantum efficiency (η_QE), were examined to assess the luminescence performance. The analysis of effective bandwidth (Δλ_eff), absorption cross-section (σ_e), and their associated parameters (σ_e × Δλ_eff and σ_e × τ) further provided insights into the optical behavior. The phosphor demonstrated a high quantum efficiency of 94 %, with a photoluminescence decay time of 2.0108 ms for the 1 mol % Eu³⁺-doped sample, confirming efficient energy transfer and emission stability.Furthermore, the CIE chromaticity coordinates confirmed the excellent color purity of the synthesized phosphor. The strong radiative characteristics associated with Ω₂ and Ω₄ intensity parameters reinforce the suitability of Eu³⁺-doped NaSrY(BO₃)₂ for applications in display technologies and solid-state lighting.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"191 ","pages":"Article 113562"},"PeriodicalIF":5.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166530","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}

{"title":"Visible-light-driven photocatalytic degradation of atrazine over Ag2O-BaTiO3 S-scheme heterojunction photocatalyst","authors":"Soliman I. El-Hout ,&nbsp;Fatehy M. Abdel-Haleem ,&nbsp;Reda M. Mohamed ,&nbsp;Faisal K. Algethami","doi":"10.1016/j.materresbull.2025.113557","DOIUrl":"10.1016/j.materresbull.2025.113557","url":null,"abstract":"<div><div>Water pollution is one of the more significant worldwide problems; notably, water pollution caused by harmful herbicides like Atrazine negatively influences the health of individuals and the ecosystem. The rendering of conventional methods is ineffective for treating antibiotic-laden wastewater. Currently, photocatalytic technology has emerged as a promising solution for degrading low-concentration, water-soluble herbicide residues through deep mineralization. Here, we showed a hydrothermally-prepared BaTiO₃ coupled with different contents of <strong>narrow-bandgap</strong> silver oxide (Ag₂O) nanocrystals. The synthesized materials underwent advanced characterization, which verified the successful formation of nanostructured Ag₂O-BaTiO₃. These heterostructures exhibited high specific surface areas (80–120 m²/g) while their fundamental structural and surface integrity remained intact. The photocatalytic performance of the prepared materials was further assessed for atrazine mineralization and degradation efficiency in aqueous solutions under visible-light irradiation. Optimal doping with trace concentrations of Ag₂O significantly improved light absorption, charge carrier mobility, and separation efficiency while reducing the material’s bandgap to 2.66 eV. The composite containing just 3wt% Ag₂O achieved complete photoelimination of atrazine under visible light within 1 hour, outperforming pure BaTiO₃ (8.0 ±0.5)%. Notably, the 3wt% Ag₂O-BaTiO₃ heterostructures exhibited a significantly enhanced kinetic rate constant of 4.28×10⁻² min⁻¹<strong>,</strong> ∼32.7-fold compared to pure BaTiO₃. Additionally, the heterostructures demonstrated exceptional recyclability in repeated atrazine photodegradation cycles, highlighting their practical applicability. A plausible mechanism for charge carrier separation within mesoporous Ag₂O-BaTiO₃ heterostructures was proposed, elucidating their enhanced photocatalytic activity. This study concludes that photocatalysts based on perovskite titanates will likely be utilized for water treatment purposes.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"191 ","pages":"Article 113557"},"PeriodicalIF":5.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148056","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}

{"title":"Purity of entangled photon pairs in a semiconductor–superconductor heterostructure in the presence of both Rashba and Dresselhaus SOCs","authors":"Zahra Saeedi,&nbsp;Heshmatollah Yavari","doi":"10.1016/j.materresbull.2025.113537","DOIUrl":"10.1016/j.materresbull.2025.113537","url":null,"abstract":"<div><div>Angular momentum entanglement in the superconducting state as an intrinsic property of superconductors, inducing the polarization-entangled photons, has recently been proposed as a natural source for the generation of entangled photons in P–N–S heterostructures. Breaking the structure inversion symmetry (SIS) and bulk inversion symmetry (BIS) due to Rashba and Dresselhaus spin orbit couplings (SOCs) lead to combination of singlet and triplet superconducting. We provide a general investigation of the effects of Rashba and Dresselhaus SOCs, the contribution of the components of the mixed parity gap function as well as singlet and triplet channels and spatial characteristics of the structure (<span><math><mi>θ</mi></math></span>, <span><math><mi>φ</mi></math></span>) on the purity of entangled photons. It is shown that the spin singlet pairing plays an important role to enhance the production of entangled pairs, and specifically, in the mixed state, <span><math><mrow><mi>s</mi><mo>+</mo><mi>p</mi></mrow></math></span> pairing exhibits the highest purity at <span><math><mrow><mi>θ</mi><mo>=</mo><mn>0</mn></mrow></math></span> and <span><math><mrow><mi>θ</mi><mo>=</mo><mi>π</mi></mrow></math></span>. For pure singlet pairing the highest purity is obtained from conventional <span><math><mi>s</mi></math></span>-wave pairing. Furthermore pure triplet pairing exhibits maximum purity of entangled photons at <span><math><mrow><mi>φ</mi><mo>=</mo><mn>0</mn><mo>,</mo><mspace></mspace><mi>π</mi></mrow></math></span> for equal-Rashba–Dresselhaus SOCs case. The results of this article open the window for designing systems including superconductors and semiconductors in order to produce entangled photons.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"191 ","pages":"Article 113537"},"PeriodicalIF":5.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107529","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}

{"title":"Chain length effects of aliphatic monoamine on shape memory behaviors of copolybenzoxazines","authors":"Attachai Sriwattana ,&nbsp;Manunya Okhawilai ,&nbsp;Panuwat Luengrojanakul ,&nbsp;Krittapas Charoensuk ,&nbsp;Ibrahim Lawan ,&nbsp;Panagiotis Karagiannidis ,&nbsp;Cheol-Hee Ahn ,&nbsp;Sarawut Rimdusit","doi":"10.1016/j.materresbull.2025.113556","DOIUrl":"10.1016/j.materresbull.2025.113556","url":null,"abstract":"<div><div>The objective of this research is to investigate the effect of aliphatic amine chain lengths on shape memory polymers (SMPs) properties of benzoxazine resin. Bisphenol-A, paraformaldehyde, and different aliphatic amine chain lengths at 1:4:2 mol ratio are reacted at 120 °C for an hour. The synthesized samples are represented as BA-xMA, where x is the number of C atoms ranging from 6–18. It was found that shape fixity ratio (Rf) increased with short aliphatic chain, conversely to recovery ratio (Rr). Therefore, the self-copolymerization of poly(BA-xMA/BA-a)s are developed to improve the fixation ability. Interestingly, the cyclability of the copoly(BA-12dda/BA-a) at 60/40 is significantly enhanced reaching 34 cyclability where the Rr remains almost 100 %. Furthermore, the copoly(BA-12dda/BA-a) exhibits multiple-shape memory behavior resulting from a wide range of transition temperatures. The selfcopolymerization of benzoxazine reduces molecular complexity, enhances compatibility, and simplifies preparation steps, making benzoxazine-based SMPs highly promising for advanced shape memory polymer applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"191 ","pages":"Article 113556"},"PeriodicalIF":5.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148057","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}