Aroma Detection of Ethanol Content in Fruits Using ZnO Doped Nano Thin Films

The nano materials of Zinc Oxide (ZnO) were studied to exhibit excellent properties of semi conductors and are also used as nano wires and nano rods in varied applications. In the fields of aroma sensors, Zinc Oxide acts as a very good gas sensing agent. The Zinc Oxide has properties of changing electrical conductivity and resistance values when exposed to gas sensing atmosphere. This experimental research is to identify the changes in the resistivity values when exposed to ethanol vapors at different vapor pressures. The Zinc Oxide nano films are designed by dip coating process, which results in different resistance values when exposed on the ethanol vapors. The prepared thin film of Zinc Oxide is capable of detecting the presence of ethanol vapors when doped with PVA (poly vinyl alcohol) at 3% concentration. This produces efficient results and detects the presence of ethanol even at high and low vapor pressure.