Analysis of the noble metal catalytic additives introduced by impregnation of as obtained SnO2 sol–gel nanocrystals for gas sensors |
| |
Authors: | A. Cabot J. Arbiol J. R. Morante U. Weimar N. B rsan W. G pel |
| |
Affiliation: | a Departament d'Electrònica, Universitat de Barcelona, Facultat de Fisica, C/Martí i Franquès 1, Barcelona 08028, Spain b Institute of Physical and Theoretical Chemistry, University of Tübingen, Morgenstelle 8, D-72076, Tübingen Germany |
| |
Abstract: | In order to clarify the role of the noble metal additives in the gas sensing mechanisms, three of the most common catalytic additives, such as Pd, Pt and Au, have been introduced in a sol–gel obtained tin oxide base material. The additives nominal weight concentrations used were 0.2% and 2%, and they were introduced in the precipitated tin oxide. A posterior calcination treatment was carried out, during 8 h, at the temperatures of 250°C, 400°C, 450°C, 600°C, 800°C and 1000°C. Structural and surface analysis of these nanopowders have been performed. Identification and localisation of metallic, 2+ and 4+ oxidised states of the used noble metals are discussed, and experimental evidences about their effects on the sensor performance are presented. Likewise, effects of their presence on the nanoparticle characteristics, and also on the material sensitivity to CO and CH4, are analysed and discussed. |
| |
Keywords: | SnO2 Catalytic additives Nanopowders Gas sensors Gas sensing mechanisms |
本文献已被 ScienceDirect 等数据库收录! |
|