Gas Sensing Properties of Ordered Mesoporous SnO2

Sensors

Thorsten Wagner²  Claus-Dieter Kohl²  Michael Fr¹ 

[1] Institute of Inorganic and Analytical Chemistry, Heinrich-Buff-Ring 58, D-35392 Giessen, Justus Liebig University, Giessen, Germany;Institute of Applied Physics, Heinrich-Buff-Ring 16, D-35392 Giessen, Justus Liebig University, Giessen, Germany

关键词: Tin oxide;    sensing properties;    CO;    humidity;   

DOI  :  10.3390/s6040318

来源: mdpi

【 摘 要 】

We report on the synthesis and CO gas-sensing properties of mesoporous tin(IV) oxides (SnO₂). For the synthesis cetyltrimethylammonium bromide (CTABr) was used as a structure-directing agent; the resulting SnO₂ powders were applied as films to commercially available sensor substrates by drop coating. Nitrogen physisorption shows specific surface areas up to 160 m²·g^-1 and mean pore diameters of about 4 nm, as verified by TEM. The film conductance was measured in dependence on the CO concentration in humid synthetic air at a constant temperature of 300 °C. The sensors show a high sensitivity at low CO concentrations and turn out to be largely insensitive towards changes in the relative humidity. We compare the materials with commercially available SnO₂-based sensors.

【 授权许可】

Unknown   
© 2006 by MDPI (http://www.mdpi.org).