Materials Science and Engineering: B最新文献_第7页

Bio-composites with natural, nanomaterial additives and smart manufacturing: A path to sustainable microswimmers 生物复合材料与天然，纳米材料添加剂和智能制造：可持续的微游泳者之路

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-19 DOI: 10.1016/j.mseb.2026.119213

Roopsandeep Bammidi , Hymavathi Madivada , Sreeramulu Dowluru

The design, production, and characterization procedures of completely biodegradable microswimmers using a recently created biocomposite material based on polylactic acid supplemented with graphene nanoparticles and powdered Ocimum sanctum are covered in this study. Six microswimmer prototypes were created using 4D printing, injection molding, and filament extrusion in order to compare mechanical strength, precision, thermal stability, and swimming performance. High structural integrity, form flexibility, and manufacturing precision were provided by 4D printing and filament extrusion as compared to traditional techniques. Composites' enhanced performance was confirmed by increased interfacial bonding, tensile strength, and heat resistance as a result of graphene and Ocimum sanctum alteration. The material's resilience, stability, and biocompatibility were proven by extensive characterization using methods including FTIR, SEM, TGA, DSC, and tensile and stress-strain analysis. Comparative 3D modeling helped to improve process optimization and procedure repeatability. The biocomposite has significant promise as an environmentally benign, high-performing material for ecological remediation, microfluidics, and next-generation microswimmers for biomedical devices. Future research will improve material compositions and process parameters for flexibility and multifunctional efficiency increase, while the current study establishes the foundation for biopolymer-based smart microrobotics.

本研究涵盖了完全可生物降解的微游泳器的设计、生产和表征过程，该微游泳器使用了一种基于聚乳酸、石墨烯纳米颗粒和粉末圣木的生物复合材料。为了比较机械强度、精度、热稳定性和游泳性能，使用4D打印、注塑和长丝挤出技术创建了六个微型游泳器原型。与传统技术相比，4D打印和长丝挤压提供了高结构完整性，形式灵活性和制造精度。复合材料的性能得到了增强，因为石墨烯和Ocimum的改变增加了界面结合、抗拉强度和耐热性。材料的弹性、稳定性和生物相容性通过FTIR、SEM、TGA、DSC、拉伸和应力-应变分析等方法进行了广泛的表征。对比三维建模有助于改进工艺优化和工艺可重复性。这种生物复合材料作为一种环境友好的高性能材料，在生态修复、微流体和生物医学设备的下一代微游泳器方面具有重要的前景。未来的研究将改进材料组成和工艺参数，以提高灵活性和多功能效率，而当前的研究为基于生物聚合物的智能微型机器人奠定了基础。

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引用次数: 0

Interfacial electronic modulation enables enhancement of redox kinetics in tungsten-doped NiCoLDH nanostructures for high performance supercapacitors 界面电子调制可以增强用于高性能超级电容器的钨掺杂NiCoLDH纳米结构的氧化还原动力学

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-19 DOI: 10.1016/j.mseb.2025.119173

Masood Ullah , Shakeel Ahmad , Henmei Ni , Afaq Ullah Khan , Kamran Tahir , Hassan M.A. Hassan , Sameerah I. Al-Saeedi , Zainab M. Almarhoon , Mingkun Jiang , Magdi E.A. Zaki

The present study introduces a straightforward, hydro solvothermal synthesis route for constructing W/NiCo layered double hydroxides (LDHs) nanomaterials and evaluates their suitability as supercapacitor electrodes. The electrochemical performance of the resulting nanomaterials was comprehensively examined within a supercapacitor framework. Leveraging the cooperative action of synergistic redox reactions and efficient Faradaic processes, the W/NiCoLDH system demonstrates substantial capacitive performance, achieving a specific capacitance of 1946 F g⁻¹. Additionally, a asymmetric supercapacitor (ASC) was assembled with W/NiCoLDH serving as the positive electrode and activated carbon (AC) as the negative electrode. The fabricated device delivers robust electrochemical performance, reaching an energy density of 75 Wh kg⁻¹ at a power density of 721 W kg⁻¹, retaining 84% of capacitance and exhibiting 96% coulombic efficiency after 10,000 cycles. This work outlines a feasible approach to improve the energy density of bimetallic LDH-based materials for advanced energy storage applications.

本研究介绍了一种简单的水溶剂热合成方法，用于构建W/NiCo层状双氢氧化物（LDHs）纳米材料，并评估了其作为超级电容器电极的适用性。在超级电容器框架内全面检查了所得纳米材料的电化学性能。利用协同氧化还原反应和有效的法拉第过程的协同作用，W/NiCoLDH系统表现出可观的电容性能，实现了1946 F g−1的比电容。此外，还以W/NiCoLDH为正极，活性炭（AC）为负极组装了不对称超级电容器（ASC）。该装置具有强大的电化学性能，在721 W kg - 1的功率密度下达到75 Wh kg - 1的能量密度，在10,000次循环后保持84%的电容和96%的库仑效率。这项工作概述了一种可行的方法来提高双金属ldh基材料的能量密度，用于先进的储能应用。

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引用次数: 0

Comments on “tuning electrical conductivity in lithium-doped sodium titanate via sonochemical synthesis” “通过声化学合成调整掺锂钛酸钠的电导率”评述

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-19 DOI: 10.1016/j.mseb.2026.119218

Tosapol Maluangnont

da Silva et al. (Mater. Sci. Eng. B 323 (2026) 118836) recently reported the sonochemical synthesis of lithium-doped sodium titanate Na_2-xLi_xTi₃O₇ (x = 0, 0.01, 0.02 and 0.03). They proposed three-phase products: (i) lithium-doped Na_2-xLi_xTi₃O₇ with the layered structure, (ii) undoped Na₂Ti₆O₁₃ with tunnel structure, and (iii) the NaLiTi₃O₇ impurity (at high x). It is argued that that the formation of Na_2-xLi_xTi₃O₇ is unlikely. Two major products could be assigned as undoped Na₂Ti₃O₇ and undoped Na₂Ti₆O₁₃. Also, the NaLiTi₃O₇ impurity (which has completely different structure from the layered alkali titanate) could be the structurally related Li₄Ti₅O₁₂ spinel. The present interpretation can explain the invariant unit cell parameters, the decrease of optical band gap, and the improvement of electrical conductivity observed by the original authors.

达席尔瓦等人。科学。Eng。b323(2026) 118836)最近报道了声化学合成掺锂钛酸钠Na2-xLixTi3O7 （x = 0,0.01, 0.02和0.03）。他们提出了三相产物：(i)具有层状结构的锂掺杂Na2-xLixTi3O7，（ii）具有隧道结构的未掺杂Na2Ti6O13，以及（iii） NaLiTi3O7杂质（高x）。认为Na2-xLixTi3O7不可能形成。两种主要产物分别为未掺杂的Na2Ti3O7和未掺杂的Na2Ti6O13。与层状碱钛酸盐结构完全不同的NaLiTi3O7杂质可能是与Li4Ti5O12尖晶石结构相关的。本文的解释可以解释原作者观察到的单元胞参数不变、光学带隙减小、电导率提高等现象。

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引用次数: 0

Unraveling broadened spectral response in 2D quantum dot solar cells via Sb2Se3/CaZrS3 dual chalcogenide absorbers: Insights from SCAPS-1D 通过Sb2Se3/CaZrS3双硫族吸收剂揭示二维量子点太阳能电池的宽光谱响应：来自SCAPS-1D的见解

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-19 DOI: 10.1016/j.mseb.2026.119216

Smriti Baruah , Janmoni Borah

This work presents an optimized dual chalcogenide perovskite absorber-based quantum dot solar cell (QD-CPSC) configuration, emphasizing the impact of bandgap engineering, layer thickness, dopant concentration, and defect density on both absorbers and quantum dot charge collection layers. Antimony Selenide (Sb₂Se₃) and Calcium Zirconium Trisulfide (CaZrS₃) absorbers were coupled with two-dimensional (2D) quantum dot Tungsten disulfide (WS₂), Copper Oxide (Cu₂O), and Molybdenum oxide (MoO_x) quantum dot electron and hole collection layers, achieving ideal energy band alignment that enhances optoelectronic conversion efficiency (OECE) and broadens spectral response. At a cumulative dual absorber width of 1.2 μm, 0.01 μm for each quantum dot charge collection layer, and uniform defect density of 10¹⁶ cm⁻³, the proposed FTO/WS₂/CaZrS₃/Sb₂Se₃/Cu₂O/MoOx/Au dual absorber device configuration attains a peak optoelectronic conversion (OECE) of 33.16%, short circuit current density (J_sc) of 34 mA/cm², open circuit voltage (V_oc) of 1.36 V and fill factor (FF) of 86%.This surpasses the 13.1% and 27% of OECE,11.5 mA/cm² and 31.5 mA/cm² of J_sc, 1.36 V and 1.046 V of Voc 83.8% and 84% of FF attained by CaZrS₃ and Sb₂Se₃ single-absorber counterparts. The proposed dual-absorber QD- CPSC extends the spectral response to 1100 nm with 90% quantum efficiency, outperforming the CaZrS₃ single-absorber chalcogenide solar cell (CSC) limit of 700 nm. While Sb₂Se₃ single-absorber CPSC achieves a comparable spectral range to the proposed dual absorber configuration, its quantum efficiency is lower at 55.5%. Temperature-dependent analyses revealed exceptional thermal stability, preserving its efficiency up to 31% even under elevated temperatures of 400 K.

本文提出了一种优化的基于双硫系钙钛矿吸收剂的量子点太阳能电池（QD-CPSC）结构，强调了带隙工程、层厚度、掺杂剂浓度和缺陷密度对吸收剂和量子点电荷收集层的影响。硒化锑（Sb2Se3）和三硫化锆钙（CaZrS3）吸收剂与二维（2D）量子点二硫化钨（WS2）、氧化铜（Cu2O）和氧化钼（MoOx）量子点电子和空穴收集层耦合，实现了理想的能带排列，提高了光电转换效率（OECE），拓宽了光谱响应。在累积双吸收体宽度为1.2 μm，每个量子点电荷收集层为0.01 μm，均匀缺陷密度为1016 cm−3的情况下，所提出的FTO/WS2/CaZrS3/Sb2Se3/Cu2O/MoOx/Au双吸收体器件结构的峰值光电转换（OECE）为33.16%，短路电流密度（Jsc）为34 mA/cm2，开路电压（Voc）为1.36 V，填充因子（FF）为86%。这超过了CaZrS3和Sb2Se3单吸收剂分别达到的OECE的13.1%和27%，Jsc的11.5 mA/cm2和31.5 mA/cm2， Voc的1.36 V和1.046 V， FF的83.8%和84%。所提出的双吸收体QD- CPSC将光谱响应扩展到1100 nm，量子效率为90%，优于CaZrS3单吸收体硫系太阳能电池（CSC） 700 nm的极限。虽然Sb2Se3单吸收体CPSC的光谱范围与所提出的双吸收体结构相当，但其量子效率较低，为55.5%。与温度相关的分析显示出优异的热稳定性，即使在400k的高温下，其效率也保持在31%。

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引用次数: 0

Super-stable dielectric temperature characteristic in BaTiO3-based lead-free relaxor ferroelectric ceramics batio3基无铅弛豫铁电陶瓷的超稳定介电温度特性

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-18 DOI: 10.1016/j.mseb.2026.119215

Ke Zhang , Abudulai Nancy Bawah , Ruixuan Wang, Chenglin Wang, Jingwang Lu, Jiajie Hao, Vendish Kweku Ennin, Chen Zhang

Aiming for developing a X8R MLCC lead-free dielectric, this work presents the successful synthesis of (1-x)BaTiO₃-xBi[(Mg_2/3Ta_1/3)_1–0.015xNb_0.015x]O_3+0.015x [(1-x)BT-xBMTN] lead-free ceramics via solid-state reaction route, based on the aliovalent Nb⁵⁺ doping for defect engineering. The investigation focuses on how BMTN doping influences the microstructure and functional properties involving dielectric properties, ferroelectric properties as well as relaxor behavior of the novel BT based ceramic system. The XRD analysis indicates that with increasing BMTN content, the primary phase of (1-x)BT-xBMTN ceramics changes from tetragonal to pseudo-cubic perovskite. Based on the SEM observation, the isolated secondary phases is detected and BMTN addition effectively refines grains, leading to dense microstructure with small, uniform grain size. With increasing x, a drastic shift of the ferroelectric-paraelectric phase transition temperature T_m from 107.3 °C down to −34.9 °C is found. The (1-x)BT-xBMTN ceramic with x = 0.3 achieves excellent dielectric temperature stability, satisfying the X8R specification (Δε_r/ε_r ≤ ±15%, −55 °C to 150 °C) while possessing a balanced combination of properties: A room-temperature permittivity (εᵣ_RT) of ∼600, loss tangent (tanδ_RT) of 0.0156, and breakdown strength (E_b) of 62.92 kV/cm. The (1-x)BT-xBMTN ceramics also exhibit strong frequency dispersion and enhanced phase transition diffuseness, with relaxor-like behavior validated by Vogel-Fulcher fitting. The P-E hysteresis loops indicate a decreased remanent polarization (2P_r) and polarization maximum (2P_m) after BMTN modification. The BMTN doped BT ceramics are dominated by Ohmic leakage conduction. And a recoverable energy storage density of 0.9 J/cm³ at 80 kV/cm provides a possibility for energy storage applications in (1-x)BT-xBMTN system

以开发X8R MLCC无铅介电介质为目标，采用固相反应的方法成功合成了（1-x）BaTiO3-xBi[(Mg2/3Ta1/3) 1-0.015xNb0.015x]O3+0.015x [(1-x)BT-xBMTN]无铅陶瓷。研究了BMTN掺杂如何影响新型BT基陶瓷体系的微观结构和功能特性，包括介电性能、铁电性能以及弛豫行为。XRD分析表明，随着BMTN含量的增加，（1-x）BT-xBMTN陶瓷的初生相由四方钙钛矿变为拟立方钙钛矿。通过扫描电镜观察，发现了孤立的二次相，BMTN的加入有效地细化了晶粒，形成了致密的组织，晶粒尺寸小而均匀。随着x的增加，铁电-准电相变温度从107.3℃急剧下降到- 34.9℃。x = 0.3的（1-x）BT-xBMTN陶瓷具有优异的介电温度稳定性，满足X8R规格（Δεr/εr≤±15%，- 55°C至150°C），同时具有平衡的性能组合：室温介电常数（εᵣRT）为~ 600，损耗正切（tanδRT）为0.0156，击穿强度（Eb）为62.92 kV/cm。（1-x）BT-xBMTN陶瓷还表现出强烈的频率色散和增强的相变扩散，并通过Vogel-Fulcher拟合验证了弛豫行为。P-E磁滞回线表明，经BMTN修饰后，残余极化（2Pr）和极化最大值（2Pm）降低。掺BMTN的BT陶瓷以欧姆漏导为主。在80 kV/cm下，可回收储能密度为0.9 J/cm3，为（1-x）BT-xBMTN系统的储能应用提供了可能

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引用次数: 0

Anomalous gas sensing characteristics of TiO2 nanorod arrays irradiated with high-energy ion beam 高能离子束辐照TiO2纳米棒阵列的异常气敏特性

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-18 DOI: 10.1016/j.mseb.2026.119210

Sutapa Dey , Shashi B. Mishra , Arnab Hazra , Debdulal Kabiraj , Somnath C. Roy

Controlled defect engineering using high-energy ion irradiation is an effective technique to tune the physical properties of a material at the nanoscale. Here, we report such effects on vertically oriented TiO₂ nanorod arrays grown on conductive glass substrate with different fluences, such as 5 × 10¹² and 5 × 10¹³ ions/cm², and change in resistance as a function of gas exposure was measured using hydrogen as the probe gas. The samples showed n-type characteristics from pristine to the fluence of 5 × 10¹² ions/cm²; while at higher fluence 5 × 10¹³ ions/cm², an n-to-p type transition in conductivity is observed. This is attributed to a combined effect of titanium vacancies and oxygen interstitials produced by the energetic ions. Our first-principles calculations show that higher irradiation fluence induces structural distortion that weakens hydrogen adsorption and suppresses charge transfer, collectively explaining the observed switch in gas sensing response and supporting the experimental findings.

利用高能离子辐照控制缺陷工程是在纳米尺度上调整材料物理性质的有效技术。在这里，我们报道了在导电玻璃衬底上生长的垂直取向TiO2纳米棒阵列在不同影响下的这种影响，例如5 × 1012和5 × 1013离子/cm2，并且使用氢气作为探针气体测量了气体暴露的函数电阻变化。样品从原始到5 × 1012个离子/cm2均表现出n型特征；在5 × 1013离子/cm2的高通量下，观察到电导率从n到p型转变。这是由于钛的空缺和氧的间隙产生的高能离子的综合作用。我们的第一性原理计算表明，较高的辐照通量会导致结构畸变，从而削弱氢的吸附并抑制电荷转移，从而共同解释了所观察到的气敏响应的转换，并支持了实验结果。

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引用次数: 0

Design of ZnAl-layered double hydroxide-based composite through in situ growth of ZIF-67 for enhanced photocatalytic performance 通过原位生长ZIF-67设计zno层状双氢氧化物基复合材料以增强光催化性能

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-18 DOI: 10.1016/j.mseb.2026.119202

Isna Nurmilatul Azizah, Widyan Muhammad Naufal, Sayekti Wahyuningsih, Witri Wahyu Lestari

The design of heterojunction-based photocatalysts offers a promising way to enhance photocatalytic efficiency. This study focuses on synthesizing and characterizing a ZIF-67@mixed metal oxide (ZIF-67@MMO) composite to investigate the effect of ZIF-67 incorporation on its structural and optical properties. ZnAl-layered double hydroxide (ZnAl-LDH) was synthesized using the co-precipitation method with Zn/Al molar ratios of 2, 3, and 4, followed by calcination at 800 °C to obtain MMO. XRD analysis revealed that a Zn/Al ratio of 3 produced optimal ZnO and ZnAl₂O₄ spinel phases. ZIF-67, a cobalt-based metal-organic framework, was then grown in-situ on MMO surfaces with mass ratios of 5%, 10%, and 15%. Structural and optical characterizations confirmed that all composites retained their crystalline integrity while exhibiting reduced band gap energies, thereby improving light absorption and charge separation. The ZIF-67@MMO composites enhanced electron-hole transfer efficiency, resulting in superior photocatalytic activity. The MZ67–15% composite, with 15% ZIF-67 loading, achieved nearly complete degradation of the indigo carmine (IC) dye within 120 min, showing a first-order rate constant of 31.6 × 10⁻³ min⁻¹, 6.7 times higher than that of pure MMO. Therefore, surface modification of MMO with ZIF-67 via-in situ growth is an effective strategy to develop high-performance photocatalysts for dye degradation.

异质结型光催化剂的设计为提高光催化效率提供了一条很有前途的途径。本研究的重点是合成和表征ZIF-67@mixed金属氧化物（ZIF-67@MMO）复合材料，研究ZIF-67掺入对其结构和光学性能的影响。采用共沉淀法，在Zn/Al摩尔比为2,3和4的条件下合成了znal -层状双氢氧化物（ZnAl-LDH），并在800℃下煅烧得到MMO。XRD分析表明，当Zn/Al比为3时，ZnO和ZnAl2O4尖晶石相最优。ZIF-67是一种钴基金属有机骨架，然后以5%、10%和15%的质量比在MMO表面原位生长。结构和光学表征证实，所有复合材料都保持了其晶体完整性，同时表现出降低的带隙能量，从而改善了光吸收和电荷分离。ZIF-67@MMO复合材料提高了电子-空穴转移效率，具有优异的光催化活性。MZ67-15%复合材料在添加15% ZIF-67的情况下，在120 min内几乎完全降解了靛蓝胭脂（IC）染料，一级速率常数为31.6 × 10−3 min−1，是纯MMO的6.7倍。因此，利用ZIF-67原位生长对MMO进行表面改性是开发高性能染料降解光催化剂的有效策略。

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引用次数: 0

Dye-sensitized TiO₂ for enhanced photocatalytic synthesis of hexahydroquinazolinones 染料敏化二氧化钛增强光催化合成六氢喹唑啉酮

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-17 DOI: 10.1016/j.mseb.2026.119186

Md. Afroz Bakht , Abdulrahman I. Alharthi , Mshari Alotaibi , Md Imtiaz Ali

Pomegranate-dye-sensitized TiO₂ (POM - TiO₂) is claimed to be a heterogeneous photocatalyst in the multicomponent condensation of hexahydroquinazoline derivatives. As a consequence of a significant increase in the photoresponse of TiO₂ to the visible spectrum, dye significantly shortens the optical band gap of TiO₂ to 2.40 eV, which is compared to 3.20 eV with pristine TiO₂. An outstanding yield (89–97%) of a series of hexahydroquinazolinone derivatives was obtained in 40 min at room temperature under optimized reaction conditions (2 mg/mL catalyst loading, 100 mW cm⁻² visible light irradiation). Photocatalytic reaction systems were observed to be in a pristine and thermocatalytic environment, which promoted a faster reaction rate as well as a higher conversion. Therefore, it was established that POM-TiO₂ was stable and reusable with high activity until four consecutive reactions cycle with slight activity loss. In addition, a detailed catalytic characterization (FT-IR, XRD, XPS, UV–Vis, BET and SEM) is effectively established dye-anchoring and structural integrity of the photocatalyts. This paper demonstrates the possible application of pomegranate in the work of TiO₂ as a sensitizer of natural dye in the visible light to be used in the heterocyclic synthesis in a cost-effective and environmentally friendly protocol.

石榴染料敏化TiO2 （POM - TiO2）是六氢喹唑啉衍生物多组分缩合反应中的一种多相光催化剂。由于TiO2对可见光谱的光响应显著增加，染料显著缩短了TiO2的光学带隙至2.40 eV，而原始TiO2的带隙为3.20 eV。在优化的反应条件下（催化剂负载2 mg/mL，可见光照射100 mW cm−2），室温下反应40 min，得到了一系列六氢喹唑啉酮衍生物，产率达到89-97%。光催化反应体系处于原始和热催化环境中，促进了更快的反应速率和更高的转化率。因此，POM-TiO2稳定且可重复使用，具有较高的活性，直到连续四个反应周期，活性损失较小。此外，详细的催化表征（FT-IR， XRD， XPS, UV-Vis， BET和SEM）有效地确定了光催化剂的染料锚定性和结构完整性。本文论证了石榴作为天然染料在可见光下的增感剂在TiO2的工作中的可能应用，以一种经济、环保的方案用于杂环合成。

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引用次数: 0

Irreversible adsorption behavior of CuS nanoplate-based QCM sensors toward aqueous Ammonia: Adsorption kinetics and isotherm insights 基于cu纳米板的QCM传感器对水氨的不可逆吸附行为：吸附动力学和等温线观察

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-16 DOI: 10.1016/j.mseb.2026.119212

Ayşe Nur Şahin , Ahmet Altındal , Zeynep Güven Özdemir

In this study, the ammonia (NH₃/NH₄⁺) sensing performance of two-dimensional covellite phase copper sulfide (CuS) nanoplates in aqueous media was investigated for the first time using QCM-based sensors. Hydrothermally synthesized CuS nanoplates were characterized by X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscope (FE-SEM) analyses. The CuS-coated quartz crystal microbalance (QCM) electrode exhibited clear and concentration-dependent frequency shifts ranging from approximately 1.4 to 2 MHz for NH₃ concentrations between 18.25 and 91.25 ppm. It was observed that the frequency shifts were related to NH₃ adsorption, and at higher concentrations, irreversible adsorption became dominant on the surface. UV–vis measurements showed these findings, and chemical changes in the solution pointed to the adsorption mechanism. The BET analysis also confirmed the mesoporous nature of the CuS nanoplates, providing a suitable surface for NH₃ adsorption and correlating well with the concentration-dependent QCM frequency shifts. The Elovich model showed the best fit in kinetic analyses, and the Langmuir model in isotherm analyses. These results demonstrate that both monolayer and heterogeneous adsorption behaviors are effective on the CuS surface. The findings provide a basis for the development of next-generation, low-cost, and portable CuS-based sensors that can be used in areas such as environmental monitoring, water quality control, and nuclear waste management.

在本研究中，首次采用基于qcm的传感器研究了二维covellite相硫化铜（cu）纳米板在水介质中对氨（NH₃/NH₄+）的传感性能。采用x射线衍射（XRD）和场发射扫描电镜（FE-SEM）对水热合成的cu纳米板进行了表征。cu涂层的石英晶体微天平（QCM）电极在NH₃浓度在18.25和91.25 ppm之间时表现出明显的和浓度相关的频率漂移，范围从大约1.4到2 MHz。观察到频率偏移与NH₃吸附有关，在较高浓度下，不可逆吸附在表面占主导地位。紫外可见测量显示了这些发现，溶液中的化学变化指出了吸附机制。BET分析还证实了cu纳米板的介孔性质，为NH₃吸附提供了合适的表面，并且与浓度相关的QCM频移具有良好的相关性。Elovich模型在动力学分析中最适合，Langmuir模型在等温分析中最适合。这些结果表明，cu表面的单层和非均相吸附行为都是有效的。这一发现为开发下一代低成本便携式cu传感器提供了基础，可用于环境监测、水质控制和核废料管理等领域。

{"title":"Irreversible adsorption behavior of CuS nanoplate-based QCM sensors toward aqueous Ammonia: Adsorption kinetics and isotherm insights","authors":"Ayşe Nur Şahin , Ahmet Altındal , Zeynep Güven Özdemir","doi":"10.1016/j.mseb.2026.119212","DOIUrl":"10.1016/j.mseb.2026.119212","url":null,"abstract":"<div><div>In this study, the ammonia (NH₃/NH₄+) sensing performance of two-dimensional covellite phase copper sulfide (CuS) nanoplates in aqueous media was investigated for the first time using QCM-based sensors. Hydrothermally synthesized CuS nanoplates were characterized by X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscope (FE-SEM) analyses. The CuS-coated quartz crystal microbalance (QCM) electrode exhibited clear and concentration-dependent frequency shifts ranging from approximately 1.4 to 2 MHz for NH₃ concentrations between 18.25 and 91.25 ppm. It was observed that the frequency shifts were related to NH₃ adsorption, and at higher concentrations, irreversible adsorption became dominant on the surface. UV–vis measurements showed these findings, and chemical changes in the solution pointed to the adsorption mechanism. The BET analysis also confirmed the mesoporous nature of the CuS nanoplates, providing a suitable surface for NH₃ adsorption and correlating well with the concentration-dependent QCM frequency shifts. The Elovich model showed the best fit in kinetic analyses, and the Langmuir model in isotherm analyses. These results demonstrate that both monolayer and heterogeneous adsorption behaviors are effective on the CuS surface. The findings provide a basis for the development of next-generation, low-cost, and portable CuS-based sensors that can be used in areas such as environmental monitoring, water quality control, and nuclear waste management.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"326 ","pages":"Article 119212"},"PeriodicalIF":4.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978947","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}

引用次数: 0

Temperature-dependent performance of LiMg ferrite for renewable electricity generation via hydroelectric cells 用于水力发电的LiMg铁氧体的温度依赖性性能

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B

Pub Date : 2026-01-16 DOI: 10.1016/j.mseb.2026.119203

Nilesh Kengar, Atul Teli, Guruprasad Bhinge, Chidanand Kanamadi

In this study, a Hydroelectric Cell (HEC) was developed using lithium-substituted magnesium ferrite (Li–MgFe₂O₄) synthesized by solid-state reaction and sintered between 800 and 1000 °C to evaluate the influence of sintering temperature on structure and performance. X-ray diffraction (XRD) confirmed phase formation with crystallite sizes ranging from 57.65 to 60.89 nm, while higher sintering temperatures enhanced crystallinity. Thermogravimetric analysis (TGA) showed stability up to 950 °C. Field emission scanning electron microscopy (FESEM) revealed grain sizes of 100–300 nm with temperature-dependent porosity, while EDAX verified elemental composition. Bonding characteristics were investigated by FTIR and XPS. Brunauer–Emmett–Teller (BET) analysis indicated a surface area of ∼3.2 m²/g and an average pore size of 25 nm, suitable for efficient water dissociation. Electrochemical impedance spectroscopy (EIS) showed a sharp impedance drop from 10⁷ Ω to 10 Ω during operation. Upon water introduction, H₂O molecules dissociated into OH⁻ and H₃O⁺ ions; confinement of H₃O⁺ within nanopores created an internal field, promoting faster ion transport and enhanced ionic current. Power generation occurred through oxidation of the Zn anode by OH⁻ ions and reduction of H₃O⁺ at the Ag cathode. The HEC sintered at 1000 °C (area 19.6 cm²) exhibited superior performance, achieving 15 mW power output, 50 mA short-circuit current, and 1.2 V open-circuit voltage. Overall, the results demonstrate the role of sintering temperature in tailoring LiMg ferrite properties and highlight its promise as an efficient, eco-friendly catalyst for sustainable hydroelectric cell technology.

本研究采用固相反应合成锂取代铁酸镁（Li-MgFe₂O₄）制备了一种水电电池（HEC），并在800 ~ 1000℃之间烧结，考察了烧结温度对其结构和性能的影响。x射线衍射（XRD）证实，晶体尺寸在57.65 ~ 60.89 nm之间，较高的烧结温度增强了结晶度。热重分析（TGA）表明其稳定性可达950°C。场发射扫描电镜（FESEM）显示晶粒尺寸为100-300 nm，孔隙度与温度有关，而EDAX则验证了元素组成。用FTIR和XPS研究了其键合特性。brunauer - emmet - teller （BET）分析表明，该材料的表面积为~ 3.2 m2/g，平均孔径为25 nm，适合高效解离水。电化学阻抗谱（EIS）显示，在运行过程中，阻抗从107 Ω急剧下降到10 Ω。引入水后，H₂O分子解离成OH -和H₃O+离子；H₃O+被限制在纳米孔内产生了一个内部场，促进了更快的离子传输和增强的离子电流。发电是通过OH−离子氧化Zn阳极和在Ag阴极还原H₃O+发生的。在1000℃（面积19.6 cm2）下烧结的HEC具有优异的性能，输出功率为15 mW，短路电流为50 mA，开路电压为1.2 V。总体而言，结果表明烧结温度在调整LiMg铁氧体性能方面的作用，并突出了其作为可持续水电电池技术的高效，环保催化剂的前景。

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引用次数: 0