NO2 Gas Sensor Based on ZnO Nanorods Synthesised by Thermal Evaporation Method
Nanorods (NRs) of Zinc Oxide have been synthesized by thermal evaporation technique followed by annealing in argon gas atmosphere. As-prepared ZnO NRs are cleaver to sense a toxic nitrogen dioxide gas. ZnO NRs are characterized for structural and surface morphological studies through X-ray diffraction and scanning electron microscopy equipments. The crystal structural revelation reveals the configuration of hexagonalwurtzite crystal structure of ZnO. Morphological analysis presents the randomly distributed ZnO NRs over the surface of the glass substrate. The gas sensing cram of ZnO NRs has been carried out systematically by utilizing convention fabricated gas sensing setup towards a different of poisonous gases, ZnO NRs sensor providea highest response of 128% on exposure of 100 ppm NO2at 200 °C as operating temperature along with a very rapid response & recovery time. Moreover, a ZnO NRs sensor acquires tremendous stability, reversibility and marvels reproducibility in gas response also.
KeywordsZnO Nanorods xrd Sem Nitogen dioxide gas
Prof. V.B. Patil is thankful to DAE-BRNS, India (scheme no.34/14/21/2015-BRNS) for the financial support.