Volatile Organic Compounds Sensing Characteristics of Nanocrystalline Co Doped ZnO Pallet
Volatile Organic Compounds (VOCs) like acetone and ethanol are extremely flammable and explosive in higher temperature. Apart from that it is toxic to human breathing i.e., if inhaled in high concentrations may cause asphyxiation. Symptoms may include loss of mobility or consciousness. Inhaling in low concentrations may cause narcotic effects. Considering this aspect, in this present work nanocrystalline Co doped ZnO sample was prepared by sol–gel technique followed by calcinations at 650 °C. 10 mm diameter and 2 mm thickness cylindrical pallet has been prepared from the calcined powders by using hydraulic press and then annealed at a temperature of 700 °C for 4 hours. The X-ray diffraction (XRD) pattern of Co doped ZnO sample indicates the polycrystalline in nature of the sample and exists in wurtzite phase. The average crystallite size calculated using Scherer formula is in the order of 47 nm. From Hall measurement study, it is found that Co doped ZnO sample is of n-type. A portable gas sensing evaluation chamber coupled with a National Instrument module with data logging and control software is indigenously designed and fabricated to measure automatically the change in sensor resistance as it has been exposed to various test gases (ethanol and acetone). The sensitivity of both the gases as a function of operating time and temperature with the help of Co doped ZnO sample were analyzed. At higher temperature nanocrystalline Co doped ZnO has shown a better sensitivity to both the gases of less than 100 ppm concentration.
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Document Type: Research Article
Publication date: February 1, 2016
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