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۱Fabrication of Zinc Oxidenanorods Based Gas Sensor
اطلاعات انتشار: World Applied Sciences Journal، سي ام،شماره۱، ۲۰۱۴، سال
تعداد صفحات: ۷
Zinc oxide (ZnO) nanorods are considered as most suitable materials for the fabrication of gas sensors due to their high sensing properties. In this research a simple gas sensor has been fabricated based upon the principle of change in resistivity due to oxygen vacancies which make its surface chemically and electrically active. When charge accepting molecules adsorb at the vacanciessignificant variation appears in conductivity. A comb like structure was made on a substrate through photolithography. Gold was sputtered on the substrate for making contacts as well as catalyst for ZnO nanorods. Chromium was used as adhesive layer prior to gold sputtering. For ZnO nanorods growth hydrothermal method was adopted. The as prepared Zn Onanostructures, distribution and morphologies were characterized by scanning electron microscope (SEM) and x–ray diffraction. The SEM reveals the wurtzite hexagonal crystalline nanostructure grown along the [0001] direction. The ZnO nanosensor was tested for different concentrations of ethanol gas and different operating temperatures. The resistance between the two contacts has beenevaluated as a function oftemperature and gas concentration. The best sensor response was recorded at operating temperature of 300°C.
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