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Synthesis, characterization and gas sensing properties of rutile TiO2 doped with Pt obtained by sol-gel method

G. TELIPAN1,* , M. IGNAT1, C. TABLET2, V. PARVULESCU2

Affiliation

  1. Research & Development National Institute for Electrical Engineering – INCDIE ICPE-CA, Bucuresti, Splaiul Unirii nr. 313, Sector 3, 030138, Romania
  2. Institute of Physical Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania

Abstract

The gas sensitive oxide TiO2 doped with Pt was obtained by sol gel polymeric method. The reagents used as precursors were the tetra-iso- propylortotitanate alcoxide, platinum chloride, surfactant butylamonium bromide and polyvinibutyral as polymer. The molar ratio used surfactant/alcoxide=0.1. The materials were obtained as films or powders. The obtained gels were dried at 373 K and heat treated in air between 473-873 K The films were obtained by dipping method and the support was CeO2-Ta2O5 disc. The obtained materials was characterized by XRD, SEM, TEM electron microscopy and N2 adsorption-desorption. The sensing properties of TiO2-Pt films were tested in NOx and CO2.. For the 10 mg/m3 NOx and 5000 ppm CO2 after 5 minutes gas exposure, the sensor voltages were 35 mV for NOx and 65 mV for CO2..

Keywords

Gas sensors, TiO2-Pt, Semiconductor oxide, Nanostructure, Sol-gel method.

Submitted at: April 4, 2008
Accepted at: July 10, 2008

Citation

G. TELIPAN, M. IGNAT, C. TABLET, V. PARVULESCU, Synthesis, characterization and gas sensing properties of rutile TiO2 doped with Pt obtained by sol-gel method, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 8, pp. 2138-2141 (2008)