Pd-modified SnO2 octahedrons for humidity-independent ethanol vapor gas sensing

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-04-26 DOI:10.1016/j.jallcom.2025.180635

Dongting Wang , Shan Ding , Su’e Chen , Dongyu Shan , Chunjie Jiang , Xinning Zhang

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Abstract

The type and amount of oxygen adsorption species under varying humidity conditions are key factors in improving the sensitivity of SnO₂-based resistive gas sensors to combustible gases and their stability against humidity changes. We investigated the effect of Pd metal surface modification on the sensitivity stability and oxygen adsorption species of octahedral SnO₂ nanoparticles under humid conditions. The results show that, at a working temperature of 124°C and a testing temperature of 25°C, the 4 % Pd/SnO₂ sensor maintains stable sensitivity to ethanol within the relative humidity (RH%) range of 11–95 %, with a response value of approximately 42. In contrast, the unmodified SnO₂ sensor shows a gradual decrease in response as humidity increases. Pd modification effectively enhanced the sensor's response under humid conditions while maintaining good stability against humidity changes. Therefore, we have successfully improved the sensitivity stability of SnO₂ nanoparticles during humidity variations, marking an important advancement in the development of high-performance, practical resistive-type gas sensors.

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用于湿度无关乙醇蒸汽气体传感的 Pd 改性 SnO2 八面体

不同湿度条件下氧吸附物质的种类和数量是提高sno2基电阻式气体传感器对可燃性气体的灵敏度和湿度稳定性的关键因素。研究了钯金属表面修饰对八面体SnO2纳米粒子在潮湿条件下的敏感性、稳定性和氧吸附种类的影响。结果表明，在124℃的工作温度和25℃的测试温度下，4% Pd/SnO2传感器在相对湿度（RH%）为11% ~ 95%的范围内对乙醇保持稳定的灵敏度，响应值约为42。相比之下，未经改性的SnO2传感器随着湿度的增加响应逐渐降低。Pd改性有效地增强了传感器在潮湿条件下的响应，同时对湿度变化保持良好的稳定性。因此，我们成功地提高了SnO2纳米颗粒在湿度变化过程中的灵敏度稳定性，标志着高性能、实用的电阻式气体传感器的发展取得了重要进展。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.