Synthesis of Zinc Oxide Nanostructured Thin Film By Sol-Gel Method and Evaluation of Gas Sensing Properties

Ethanol sensitivity of zinc oxide (zno) thin film has been studied in present work. semiconductor thin films of zinc oxide (zno) were deposited onto soda lime glass substrates by the solgel method and dip-coating technique. the zno sol was synthesized by dissolving zinc acetate, zn (ch3coo)2.2h2o in ethanol, and then adding triethanolamin (tea). the as-coated films were preheated at 150 °c for 10 min and annealed at 500 °c for 1 h in air ambiance. zinc oxide thin films were analyzed by field emission scanning electron microscopy (fe- sem) and x- ray diffraction (xrd). in addition, gas sensitivity of the zinc oxide thin film was determined by electrical sheet resistance measurements. the sensitivity to ethanol was remarkable and response and recovery time were only 8 sec, and 4 sec, respectively.