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Yu. S. KRASNOV, G. Ya. KOLBASOV, and S. V. VOLKOV
«Polycluster Structure and Electrochemical Properties of Tungsten Oxide Films»
845–853 (2008)

PACS numbers: 78.66.Jg, 81.15.Pq, 81.16.Pr, 81.70.Pg, 82.45.Qr, 82.45.Yz, 82.47.-a

The method of cathodic deposition of amorphous tungsten-oxide films from sodium-tungstate-based electrolyte makes possible to fabricate layers of this oxide on transparent current-conducting substrates with good reproducibility of their electrochromic characteristics. Such films consist of nanoclusters, which have the sizes determined by such electrolysis parameters as deposition current density and pH of the initial electrolyte. Predominance of nanoclusters as polytungstate anions in these films distinguishes them from films obtained by other methods. As shown, the percentage of nanoclusters of different sizes in cathodically deposited films can be determined by both the analysis of the dependence of current on potential and the sequence of appearance of various absorption bands in the optical spectrum during coloration of these films.