Abstract
A soft chemical synthetic method is used to obtain highly crystalline ZnO flower thin films. Hexagonal wurtzite ZnO structure is observed from X-ray diffraction studies. A large-area jasmine flower-shaped morphology of ZnO is uniformly maintained at all deposition temperatures. The films were characterized by energy dispersive X-ray spectroscopy, Raman spectroscopy and field emission scanning electron microscopy. Elemental analysis showed the presence of Zn and O elements without any other impurity. Raman spectroscopy spectroscopy in combination with elemental and resistivity analysis indicated wurtzite ZnO structure and the presence of oxygen vacancies. The films deposited at 338 K were studied with respect to their gas sensing capability at operating temperatures of 473 K. They show a fast response (65 s) and recovery time (54 s) for NO2 gas at a concentration as low as 10 ppm.
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Acknowledgement
NGD acknowledges Department of Science and Technology (DST), New Delhi and Indian National Academy of Science (INSA), New Delhi for DST INSPIRE FACULTY award [IFA-13 pH -61 dated 1 August 2013]. Also, NGD acknowledges UGC-DAE Consortium for Scientific Research (CSR), Indore for research funding through CRS project [CSR/Acctts/2015–16/81 dated 27 April 2015].
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Rane, Y.N., Shende, D.A., Raghuwanshi, M.G. et al. Synthesis of flower shaped ZnO thin films for resistive sensing of NO2 gas. Microchim Acta 184, 2455–2463 (2017). https://doi.org/10.1007/s00604-017-2271-7
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DOI: https://doi.org/10.1007/s00604-017-2271-7