A titanium-containing organic thin film was prepared from titanium tetraisopropoxide (TIPP) by plasma polymerization. The effects of photoirradiation (visible light) on the electric conductivity of the film in the presence of organic vapors such as ethanol, acetaldehyde, formaldehyde, and benzaldehyde were investigated at various temperatures. The film showed electric current changes as large as 6-20 μA when exposed to ethanol and acetaldehyde under visible light irradiation. These results indicated the possibility of an organic gas sensor operable below 100°C.
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