Room temperature hydrogen sensor based on SnO2 : La2O3

A semiconductor gas sensor using tin dioxide along with palladium and lanth anum oxide was found to exhibit high sensitivity and selectivity to hydroge n in air compared to liquefied petroleum gas, carbon monoxide, methane, hyd rogen sulfide, and ammonia at room temperature. The choice of La2O3 and the noble metal additive and their exact loading were very critical for the de tection of hydrogen. 0.5 wt % Pd and 2 wt % La2O3 in tin dioxide was thr op timized composition for maximum sensitivity to hydrogen at room temperature . (C) 2000 The Electrochemical Society. S0013-4651(99)01-051-3. All rights reserved.