WO3 nanopaticles and PEDOT:PSS/WO3 composite thin films studied for photocatalytic and electrochromic applications

19th International Summer School on Vacuum, Electron and Ion Technologies

Boyadjiev, Stefan Ivanov^1 ; Manduca, Bruno^2 ; Szcs, Júlia^2 ; Szilágyi, Imre Miklós^1,2

MTA-BME Technical Analytical Chemistry Research Group, Szent Gellért tér 4, Budapest

H-1111, Hungary^1

Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, 4 Megyetem rakpart, Budapest

H-1111, Hungary^2

关键词: Electro-chromic applications;    Electrochromic properties;    Energy dispersive X ray spectroscopy;    Photocatalytic activities;    Photocatalytic application;    Photocatalytic surfaces;    Powder X ray diffraction;    Voltammetry measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/700/1/012019/pdf
DOI  :  10.1088/1742-6596/700/1/012019

来源: IOP

【 摘 要 】

WO3is a widely studied material for electrochromic and photocatalytic applications. In the present study, WO3nanoparticles with a controlled structure (monoclinic or hexagonal) were obtained by controlled thermal decomposition of hexagonal ammonium tungsten bronze in air at 500 °C and 600 °C, respectively. The formation, morphology, structure and composition of the as-prepared nanoparticles were studied by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy (SEM-EDX). The photocatalytic activity of the monoclinic and hexagonal WO3nanoparticles was studied by decomposing methyl orange in aqueous solution under UV light irradiation. In order to study the electrochromic properties of the WO3nanoparticles, as well to introduce them for self-cleaning photocatalytic surface applications, thin films were prepared from the WO3particles together with a conductive polymer. For this, PEDOT:PSS was used, which gives excellent opportunities for obtaining transparent and conductive thin films, suitable for both electrochromic and photocatalytic applications. By spin-coating, transparent PEDOT:PSS/WO3composite thin films were prepared, on which cyclic voltammetry measurements were performed, and the coloring and bleaching states were studied. Our initial results for the PEDOT:PSS/WO3composite thin films are promising, suggesting that such composites, after further development, might be successfully used in electrochromic devices and photocatalysis.