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Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS 2 Nanotubes
Author(s) -
Polyakov Alexander Yu.,
Kozlov Daniil A.,
Lebedev Vasily A.,
Chumakov Ratibor G.,
Frolov Alexander S.,
Yashina Lada V.,
Rumyantseva Mari.,
Goodilin Eugene A.
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201803502
Subject(s) - x ray photoelectron spectroscopy , materials science , nanocomposite , raman spectroscopy , analytical chemistry (journal) , nanoparticle , adsorption , chemical engineering , transmission electron microscopy , nanotechnology , chemistry , optics , physics , chromatography , engineering
Composites of WS 2 nanotubes (NT‐WS 2 ) and gold nanoparticles (AuNPs) were prepared using aqueous HAuCl 4 solutions and subjected to surface analysis. The obtained materials were jointly characterized by X‐ray photoelectron (XPS), Raman scattering (RSS), and ultraviolet photoelectron (UPS) spectroscopies. Optical extinction spectroscopy and electron energy loss spectroscopy in the scanning transmission electron microscopy regime (STEM‐EELS) were also employed to study plasmon features of the nanocomposite. It was found that AuNPs deposition is accompanied by a partial oxidative dissolution of WS 2 , whereas 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‐WS 2 and Au‐NT‐WS 2 to the adsorption of NO 2 gas was also demonstrated at room temperature using periodical illumination by a 530 nm light‐emitting diode. Au‐NT‐WS 2 nanocomposites are found to possess a higher photoresponse and enhanced sensitivity in the 0.25–2.0 ppm range of NO 2 concentration, as compared to the pristine NT‐WS 2 . This behaviour is discussed within the physisorption‐charge transfer model to explore sensing properties of the nanocomposites.