Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS2 Nanotubesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 марта 2019 г.
Аннотация:Composites of WS2 nanotubes (NT‐WS2) and gold nanoparticles (AuNPs) were prepared using HAuCl4 aqueous solutions and subjected to the surface analysis. The obtained materials were jointly characterized by X‐ray photoelectron (XPS), Raman scattering (RSS), ultraviolet photoelectron (UPS) spectroscopies. Optical extinction spectroscopy and electron energy loss spectroscopy in scanning electron microscopy regime (STEM‐EELS) were also employed to study plasmon features of the nanocomposite. We found that AuNPs deposition is accompanied by a partial oxidative dissolution of WS2, while Au‐S interfacial species could be responsible for the tight contact of metal nanoparticles and the disulfide. A remarkable sensitivity of n‐type resistance of NT‐WS2 and Au‐NT‐WS2 to the adsorbing NO2 gas was also demonstrated at room temperature using periodical illumination by 530 nm light‐emitting diode. Au‐NT‐WS2 nanocomposites are found to possess higher photoresponse and enhanced sensitivity in the 0.25‐2.0 ppm range of NO2 concentration as compared to the pristine NT‐WS2. This behavior is discussed within the physisorption‐charge transfer model to explore sensing properties of the nanocomposites.