Alcohol vapours sensor based on thin polyaniline salt film and quartz crystal microbalance.
A sensor based on the quartz crystal microbalance (QCM) technique was developed for detection of a number of primary aliphatic alcohols such as ethanol, methanol, 1-propanol, and 2-propanol vapours. Detection was based on a sensitive and a thin film of polyaniline, emeraldine salt (ES), coated the QCM electrode. The frequency shifts (Delta f) of the QCM were increased due to the vapour absorption into the ES film. The values of Delta f were found to be linearly correlated with the concentrations of alcohols vapour in mg L(-1). The changes in frequency are due to the hydrophilic character of the ES and the electrostatic interaction as well as the type of the alcohol. The sensor shows a good reproducibility and reversibility. The diffusion and diffusion coefficient (D) of different alcohols vapour were determined. It was found that the sensor follows Fickian kinetics.
Department of Chemistry, University of Tanta, Tanta, Egypt. mayad12000@yahoo.com
Mohamad M
MM
Ayad
Nagy L
NL
Torad
D000438:Alcohols / Q000032:analysis*; D000814:Aniline Compounds; D055664:Electrochemical Techniques; D008567:Membranes, Artificial; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results; D055672:Static Electricity; D055549:Volatile Organic Compounds / Q000032:analysis*
D000438:Alcohols; D000814:Aniline Compounds; D008567:Membranes, Artificial; D055549:Volatile Organic Compounds; C416807:polyaniline