Controlling the Composition of Nanosize Hexagonal WO3 for Gas Sensing

Imre Miklós Szilágyi; Sami Saukko; János Mizsei; Péter Király; Gábor Tárkányi; Attila Lajos Tóth; András Szabó; Katalin Varga-Josepovits; János Madarász; György Pokol

doi:10.4028/www.scientific.net/MSF.589.161

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HomeMaterials Science ForumMaterials Science Forum Vol. 589Controlling the Composition of Nanosize Hexagonal...

Controlling the Composition of Nanosize Hexagonal WO₃ for Gas Sensing

Abstract:

Hexagonal (h-) WO3 was prepared through heating hexagonal ammonium tungsten bronze (HATB), (NH4)0.07(NH3)0.04(H2O)0.09WO2.95. By adjusting the heating temperature and atmosphere of HATB, we could control the oxidation state of tungsten atoms and the residual NH3/NH4 + content in h-WO3. The as-produced h-WO3 nanoparticles with different composition were tested as gas sensors and the effect of composition on gas sensing properties was studied. Our results showed that oxidized h-WO3 had the best sensitivity to H2S.