期刊
CHEMOSENSORS
卷 10, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/chemosensors10010009
关键词
Au-decorated WS2 microflakes; chemical gas sensors; NH3
资金
- National Key R&D Program of China [2021YFB3201302]
- National Natural Science Foundation of China [61971085, 62111530055]
- Fundamental Research Funds for the Central Universities [DUT19RC(3)054]
Gold nanoparticles decorated WS2 microflakes (Au/WS2) were synthesized and used as sensing materials in a chemiresistive-type sensor. Compared to pure WS2, the Au/WS2 heterostructures exhibited improved response to different concentrations of ammonia at room temperature and excellent selectivity to formaldehyde, ethanol, benzene, and acetone.
Gold nanoparticles decorated WS2 microflakes (Au/WS2) have been synthesized by an in situ chemical reducing process. A chemiresistive-type sensor using as-synthesized Au/WS2 heterostructures as sensing materials shows an improved response to different concentrations of ammonia compared to pure WS2 at room temperature. As the concentrations of gold nanoparticles increased in heterostructures, response/recovery speeds of the sensors became faster although the sensitivity of the sensor was compromised compared to the sensitivity of the sensor with lower concentrations of Au. In addition, the Au/WS2-based sensor indicated excellent selectivity to formaldehyde, ethanol, benzene and acetone at room temperature. The improved performance of the sensors was attributed to the synergistic effect of electronic sensitization and chemical sensitization between WS2 and Au.
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