甲醛
双金属片
材料科学
纳米颗粒
选择性
纳米技术
氧化物
纳米材料
化学工程
催化作用
金属
化学
有机化学
冶金
工程类
作者
Xun Liu,Jingting Han,Xiaopeng Qiao,Haijie Cai,Zhao Yong,Zhaohuan Zhang,Baiqiang Zhai,Tianjun Ni,Cheng Zhao,Yongheng Zhu
标识
DOI:10.1021/acsami.4c02211
摘要
Formaldehyde, a common illegal additive in aquatic products, poses a threat to people's health and lives. In this study, a novel metal oxide semiconductor gas sensor based on AuPd-modified WO3 nanosheets (NSs) had been developed for the highly efficient detection of formaldehyde. WO3 NS modified with 2.0% AuPd nanoparticles showed a higher response (Ra/Rg = 94.2) to 50 ppm of formaldehyde at 210 °C, which was 36 times more than the pristine WO3 NS. In addition, the AuPd/WO3 gas sensor had a relatively short response/recovery time of 10 s/9 s for 50 ppm of formaldehyde at 210 °C, with good immunity to other interfering gases and good stability for formaldehyde. The excellent gas-sensitive performance was attributed to the chemical sensitization of Au, the electronic sensitization of Pd, and the synergistic effect of bimetallic AuPd, which facilitated the recognition and response of formaldehyde molecules. Additionally, the high sensitivity and broad application prospect of the 2.0% AuPd/WO3 NS composite-based sensor in real sample detection were also confirmed by using the above sensor for the detection of formaldehyde in aquatic products such as squid and shrimp.
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