Enhanced NO2 sensing performance of WO3 nanoparticles prepared with glycine

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-05-09 DOI:10.1016/j.sna.2025.116690

Yi Zhong , Zhihua Ying , Yan Liu , Chenhan Zhang , Wenjun Yan , Yuan Jiang

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引用次数: 0

Abstract

Conventional metal oxide semiconductor gas sensors are inherently limited by their dependence on high operating temperatures (200–400℃), which leads to increased energy consumption and reduced long-term device stability. To overcome these challenges, this study presents a glycine-assisted solvent evaporation synthesis route for the preparation of highly dispersible WO₃ nanoparticles. Glycine acts dually as a crystallographic modulator during nanoparticle growth and as an interfacial stabilizer, allowing for control over both particle size and oxygen vacancy concentration. Subsequent annealing removes residual glycine while preserving the optimized nanostructure. The optimized 6-WO₃ sensor synthesized using 6 mmol glycine exhibits remarkable low-temperature sensing performance, demonstrating a response value of 270.9 toward 3 ppm NO₂ at a reduced operating temperature of 120°C compared to conventional WO₃-based counterparts while maintaining high sensitivity. Systematic characterization links this energy-efficient performance to synergistic effects between enhanced gas diffusion pathways, evidenced by a BET surface area of 20.59 m²/g, and precise modulation of electron depletion layers via glycine-mediated oxygen vacancy engineering. This work advances a practical paradigm for designing metal oxide semiconductor sensors that harmonize high sensitivity with operational sustainability, highlighting their transformative potential in next-generation environmental monitoring systems.

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甘氨酸制备的WO3纳米颗粒增强NO2传感性能

传统的金属氧化物半导体气体传感器固有地受到其对高工作温度（200-400℃）的依赖的限制，这会导致能量消耗增加，降低设备的长期稳定性。为了克服这些挑战，本研究提出了甘氨酸辅助溶剂蒸发合成制备高分散性WO3纳米颗粒的方法。甘氨酸在纳米颗粒生长过程中作为晶体调制剂和界面稳定剂，可以控制颗粒大小和氧空位浓度。随后的退火去除残留的甘氨酸，同时保留优化的纳米结构。利用6 mmol甘氨酸合成的优化后的6- wo3传感器具有优异的低温传感性能，与传统的wo3基传感器相比，在降低120℃的工作温度下，对3 ppm NO2的响应值为270.9，同时保持了较高的灵敏度。系统表征将这种节能性能与增强气体扩散途径之间的协同效应联系起来，证明了BET表面积为20.59 m2/g，以及通过甘氨酸介导的氧空位工程精确调制电子耗尽层。这项工作提出了一种设计金属氧化物半导体传感器的实用范例，该传感器协调了高灵敏度和可持续性，突出了它们在下一代环境监测系统中的变革潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...