UV-activated acetylene sensor based on WO3/NiO-modified ZnO heterostructures with good stability in transformer oil

IF 6.1 1区化学 Q1 CHEMISTRY, ANALYTICAL Talanta Pub Date : 2025-05-01 Epub Date: 2025-01-06 DOI:10.1016/j.talanta.2025.127548

He Zhang , Zhengguang Zhang , Xian Cheng , Mengzhen Wang , Bo Yu , Yingnan Yang , Wen Zeng

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Abstract

Dissolved gas analysis (DGA) is an effective method for diagnosing potential faults in oil-immersed power transformers. Metal oxide semiconductor (MOS) gas sensors exhibit excellent performance. However, high operating temperatures can accelerate device aging, thereby reducing the reliability of online monitoring. In this study, hierarchical porous pure ZnO and WO₃/NiO–ZnO heterojunction nanocomposites were synthesized via a facile hydrothermal method. The acetylene sensing characteristics of pure ZnO and heterojunction sensors were investigated in the absence and presence of UV irradiation. The results indicated that the NiO–ZnO sensor exhibited superior gas sensitivity compared to pure ZnO and WO₃–ZnO sensors. For the NiO–ZnO sensor, the optimal operating temperature under UV irradiation decreased to as low as 60 °C. Additionally, the performance decay of the sensor over 60 days of accelerated aging was documented. Notably, the long-term stability of sensors was significantly improved under UV irradiation. The enhanced properties were possibly attributed to the synergistic effect between photoelectrons excited by UV light and heterojunctions. Photo-activated free electrons could promote the adsorption of oxygen, leading to the formation of photoinduced oxygen ions.

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基于WO3/ nio修饰ZnO异质结构的紫外活化乙炔传感器在变压器油中具有良好的稳定性。

溶解气体分析（DGA）是诊断油浸式电力变压器潜在故障的有效方法。金属氧化物半导体（MOS）气体传感器具有优异的性能。但是，高温会加速设备老化，从而降低在线监测的可靠性。本研究采用水热法合成了层叠多孔纯ZnO和WO3/NiO-ZnO异质结纳米复合材料。研究了纯ZnO和异质结传感器在无紫外照射和有紫外照射情况下的乙炔传感特性。结果表明，与纯ZnO和WO3-ZnO传感器相比，NiO-ZnO传感器具有更好的气敏性。对于NiO-ZnO传感器，紫外线照射下的最佳工作温度降至60℃。此外，还记录了传感器在60天加速老化过程中的性能衰减。值得注意的是，传感器在紫外线照射下的长期稳定性显著提高。这种性能的增强可能是由于紫外光激发的光电子与异质结之间的协同作用。光激活的自由电子可以促进氧的吸附，导致光诱导氧离子的形成。

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来源期刊

Talanta 化学-分析化学

CiteScore

12.30

自引率

4.90%

发文量

861

审稿时长

29 days

期刊介绍： Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome. Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.