Simultaneous Analysis of Aliphatic Alcohols Mixtures Using an Electronic Nose Based on Nano/Microstructured Conducting Polypyrrole Film Prepared by Catalytic Electropolymerization on Cu/Au Interdigital Electrodes Using Multivariate Calibration

摘要

In this paper, nano/microstructured-conducting polypyrrole has been prepared on Cu/Au interdigital electrode surfaces by using constant potential amperometry technique. The Fe(II) ions were used as catalyst and , pTs, Cl, TCA, DS, DBS was implemented as anion dopants. The morphologies of the films were investigated by field emission scanning electron microscope. A remarkable dependence was observed between the type of anion dopant and the morphology of polypyrrole (PPy). The sensing behavior of the PPy-X sensor has been studied toward acetone, methanol, ethanol, 1-propanol, 2-propanol, nitromethane, propylamine, pyridine, and gas mixtures of aliphatic alcohols. The responses of the six gas sensors were collected as an electronic nose in the presence of pure aliphatic alcohols and random mixtures of alcohols in the gas phase. The correlations between sensor responses and concentration of aliphatic alcohols were investigated by the multivariate generalized least square technique. The differences in sensor response patterns for aliphatic alcohols were used for simultaneous analysis of methanol, ethanol, 1-propanol, and 2-propanol. Quantitative determinations of the different gas mixtures were analyzed by the proposed array sensor as an electronic nose and calculated compositions compared with real values. The results are in good agreement with the true compositions of alcohol mixtures and the maximum relative error is <10%. The average error of measurement for each component is <3%.