异质结
材料科学
纳米复合材料
氨
傅里叶变换红外光谱
甲醇
丙酮
漫反射红外傅里叶变换
溴化物
化学工程
化学
纳米技术
光电子学
无机化学
催化作用
光催化
有机化学
工程类
作者
Qiyilan Guang,Baoyu Huang,Jun Yu,Maryam Bonyani,Mohammad Moaddeli,Mansour Kanani,Ali Mirzaei,Hyoun Woo Kim,Sang Sub Kim,Xiaogan Li
标识
DOI:10.1016/j.snb.2023.134399
摘要
In this paper, platinum sulfide decorated WS2 microflakes (PtS/WS2) heterostructure nanocomposites were prepared by an in-situ chemical reduction process. The chemiresistive-type gas sensor based on the synthesized PtS/WS2 heterostructure nanocomposites exhibited a significantly improved sensing properties compared to that of the pure WS2 microflakes at different concentration of NH3 from 1 ppm to 10 ppm at room temperature. As the concentrations of PtS nanoparticles decorated on the surface of WS2 microflakes increased, the response of the PtS/WS2 heterostructure sensor to ammonia firstly increased when the concentration of PtS increased up to 1 wt%, whereas above 1%, the response decreased instead. Moreover, it was found that the response speeds of the PtS-decorated WS2 were significantly improved compared to that pure WS2. The sensors also exhibited excellent selectivity to formaldehyde, toluene, acetone, methanol and ethanol at room temperature. The sensing mechanisms were studied by using the in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The enhanced sensing properties could be explained by “electronic sensitization” effect induced by the PtS/WS2 heterostructure, being confirmed by density functional theory (DFT) calculations.
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