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Humidity sensing characteristics of thick-film sensors based on α-Fe 2 O 3 nanoparticles synthesized by hydrothermal method have been reported. The as-synthesized α-Fe 2 O 3 nanoparticles were characterized by using XRD, Raman spectroscopy, TEM and HRTEM. Our TEM result depicts that the size of α-Fe 2 O 3 nanoparticles were in therange of 20-30 nm with highly crystalline nature. For humidity sensing experiment, the sensitivity of our α-Fe 2 O 3 nanoparticles-based sensor device was found to be ~99% and the fastest response times were noted, which indicatethat the α-Fe 2 O 3 nanoparticle-based humidity sensor device has more future prospects and demand. The humiditysensing properties of α-Fe 2 O 3 nanoparticles seem to be associated to the sorption sites for the water molecules at thenanoparticles interfaces.

Defect-rich titanium oxide films revealed overlayers of chemi-sorbed oxygen, producing a significant enhancement in sensitivity towards H2S gas with greater stability, better selectivity and quicker recovery.