Controlling the Composition of Nanosize Hexagonal WO<sub>3</sub> for Gas Sensing
2008; Trans Tech Publications; Volume: 589; Linguagem: Inglês
10.4028/www.scientific.net/msf.589.161
ISSN1662-9760
AutoresImre Miklós Szilágyi, Sami Saukko, J. Mizsei, P. Király, Gábor Tárkányi, A.L. Tóth, András Szabó, Katalin Varga-Josepovits, János Madarász, György Pokol,
Tópico(s)Analytical Chemistry and Sensors
ResumoHexagonal (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.
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