Abstract

ANDRADE, Ricardo L. T.; LINDINO, Cleber A.  and  BULHOES, Luis Otavio de Sousa. Controlled atmosphere system for gas sensors characterization. Quím. Nova [online]. 1998, vol.21, n.3, pp. 348-350. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40421998000300019.

This paper describes a sample holder for the electrical measurement of oxides or conducting polymers in the form of pellets or films which are used as gas sensors. The system makes it possible to control the sample temperature, the gas pressure and composition. The temperature in the sample can be changed from 25ºC to 450ºC, and the gas pressure in the chamber is controlled between 5 ¥ 10^-4 and 1000 mbar. The performance of the system in resistance measurements of doped tin oxide pellets and polyaniline films deposited on platinum electrodes for methane is analyzed.

Keywords : gas chamber; gas sensors; oxides; conducting polymers.