Ayad Mohamad M, El-Hefnawey Gad, Torad Nagy L
Department of Chemistry, Faculty of Science, University of Tanta, Tanta, Egypt.
J Hazard Mater. 2009 Aug 30;168(1):85-8. doi: 10.1016/j.jhazmat.2009.02.003. Epub 2009 Feb 7.
Thin films of polyaniline base, emeraldine base (EB), coating on the quartz crystal microbalance (QCM) electrode were used as a sensitive layer for the detection of a number of primary aliphatic alcohols such as ethanol, methanol, 2-propanol and 1-propanol vapours. The frequency shifts (Deltaf) of the QCM were increased due to the vapour adsorption into the EB film. Deltaf were found to be linearly correlated with the concentrations of alcohols vapour in part per million (ppm). The sensitivity of the sensor was found to be governed by the chemical structure of the alcohol. The sensor shows a good reproducibility and reversibility. The diffusions of different alcohols vapour were studied and the diffusion coefficients (D) were calculated. It is concluded that the diffusion of the vapours into the EB film follows Fickian kinetics.
聚苯胺碱、翠绿亚胺碱（EB）的薄膜涂覆在石英晶体微天平（QCM）电极上，用作检测多种伯脂肪醇（如乙醇、甲醇、2-丙醇和1-丙醇蒸汽）的敏感层。由于蒸汽吸附到EB薄膜中，QCM的频率偏移（Δf）增加。发现Δf与百万分之一（ppm）的醇蒸汽浓度呈线性相关。发现传感器的灵敏度受醇的化学结构支配。该传感器具有良好的重现性和可逆性。研究了不同醇蒸汽的扩散并计算了扩散系数（D）。得出的结论是，蒸汽向EB薄膜中的扩散遵循菲克动力学。
