Cataluminescence sensor for gaseous acetic acid using a thin film of In2O3
We report on a cataluminescence sensor for the determination of gaseous acetic acid. It is based on a 60-nm thick sol–gel film of In2O3 on a ceramic support. SEM, XPS and surface profiling were applied for its characterization. It is found that aluminum ions of the ceramic substrate penetrate into the film and produce a synergetic catalytic effect. The sensor displays high sensitivity and specificity for acetic acid, a low detection limit, a wide linear range and a fast response. No (or only very low) interference was observed by formic acid, ammonia, acrolein, benzene, formaldehyde, ethanol, and acetaldehyde. The sensor was successfully applied to the determination of acetic acid in spiked air samples. We also discuss a conceivable mechanism (based on the reaction products) for the cataluminescence resulting from the oxidation reaction on the surface of the sensor film.
KeywordsAcetic acid In2O3 film Chemiluminescence Gas sensor
The authors gratefully thank for the financial support by the National Natural Science Foundation of China (No. 21075024) and Technology Project Foundation of Guangzhou City (No. 2010Y1-C021).
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