Thick film resistive Cl2 sensors were fabricated using SnO2 doped with Sb. The nanocrystalline powders of Sb-doped SnO2 synthesized by a sol–gel method were compressed into an 800 µm thick pellet. The fabricated sensors were tested against gases like Cl2, Br2, HCl, NO, NO2, CHCl3, NH3 and H2. The highest response to Cl2 was achieved in 0.1% Sb doping where an exposure to 3 ppm of Cl2 gas led to a 500-fold increase in device resistance. The high sensitivity to Cl2 is accompanied by minor interference due to other gases at room temperature. It was found that the SnO2 doped with 0.1% Sb exhibited high response, selectivity (>100 in comparison to the gases described above) and short response time (~60 s) to Cl2 at 3 ppm level at room temperature.
Available at: http://works.bepress.com/shankar_rananavare/18/