Ultrathin WO3 Nanosheets/Pd with Strong Metal-Support Interactions for Highly Sensitive and Selective Detection of Mustard-Gas Simulants

文献类型： 外文期刊

第一作者： Li, Haizhen

作者： Li, Haizhen;Ma, Qingyu;Li, Haizhen;Wu, Gang;Wu, Jina;Shen, Jun;Chen, Likun;Zhang, Jingjing;Zheng, Yongchao;Mao, Yuyin;Cheng, Hefeng;Zhang, Maolin

作者机构：

关键词： sulfur mustard simulants; gas sensors; tungstentrioxide; palladium; metal-support interactions

期刊名称：ACS SENSORS （ 影响因子：8.2； 五年影响因子：8.4 ）

ISSN： 2379-3694

年卷期： 2024 年 9 卷 7 期

页码：

收录情况： SCI

摘要： Exposure to mustard gas can cause damage or death to human beings, depending on the concentration and duration. Thus, developing high-performance mustard-gas sensors is highly needed for early warning. Herein, ultrathin WO3 nanosheet-supported Pd nanoparticles hybrids (WO3 NSs/Pd) are prepared as chemiresistive sulfur mustard simulant (e.g., 2-chloroethyl ethyl sulfide, 2-CEES) gas sensors. As a result, the optimal WO3 NSs/Pd-2 (2 wt % of Pd)-based sensor exhibits a high response of 8.5 and a rapid response/recovery time of 9/92 s toward 700 ppb 2-CEES at 260 degrees C. The detection limit could be as low as 15 ppb with a response of 1.4. Moreover, WO3 NSs/Pd-2 shows good repeatability, 30-day operating stability, and good selectivity. In WO3 NSs/Pd-2, ultrathin WO3 NSs are rich in oxygen vacancies, offer more sites to adsorb oxygen species, and make their size close to or even within the thickness of the so-called electron depletion layer, thus inducing a large resistance change (response). Moreover, strong metal-support interactions (SMSIs) between WO3 NSs and Pd nanoparticles enhance the catalytic redox reaction performance, thereby achieving a superior sensing performance toward 2-CEES. These findings in this work provide a new approach to optimize the sensing performance of a chemiresistive sensor by constructing SMSIs in ultrathin metal oxides.

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