Hydrogen sensing characteristics of thick films of nanoparticles (∼35nm diameter) of ZnO, 3% Co doped ZnO, 1% Pt-impregnated ZnO and 1% Pt-impregnated 3% Co–ZnO have been investigated. The last composition exhibits the highest sensitivity for 10–1000ppm H2, reaching values upto 1700 as well as good response and recovery times at 125°C or lower. The sensor is not affected significantly upto 50% relative humidity.
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