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    Effect of humidity on electrical conductivity of zinc stearate nanofilms

    Year: 2007

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 302, Issues 1-3, 20 July 2007, Pages 67-74, 20111221

    Authors: Serdar Ozturk, Devrim Balkose, Salih Okur, and Junzo Umemur

    Organizations: Department of Chemical Engineering, Izmir Institute of Technology, Gulbahce Campus, Urla, Izmir 35430, Turkey, Department of Physics, Faculty of Science, Izmir Institute of Technology, Gulbahce Campus, Urla, Izmir 35430, Turkey, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China

    In this work, stearic acid (StAc) and zinc stearate (ZnSt2) nanofilms were deposited on glass and silver substrates using Langmuir–Blodgett (LB) film technique and their structural and electrical properties were investigated. X-ray diffraction and IR techniques revealed that more crystalline and better films were obtained from ZnSt2 compare to StAc. Electrical conductivity of ZnSt2 LB films with 13 layers having 28 nm thickness were measured in the range of humidity of 20–60% and it is seen that the conductivity was very sensitive to relative humidity (RH) above 40% at 25 °C and showed no hysteresis during adsorption and desorption of water vapor. Water vapor adsorption isotherm of ZnSt2 powders was determined and conductivity increase with humidity was attributed to water vapor adsorption.

    Constant electrical conductivity of the ZnSt2 films at low relative humidities and at low voltage values is an advantageous property which allows using them as organic nanofilms with insulating properties.