期刊
MICROCHIMICA ACTA
卷 184, 期 7, 页码 2455-2463出版社
SPRINGER WIEN
DOI: 10.1007/s00604-017-2271-7
关键词
Zinc oxide; Flower-shaped ZnO; Raman studies; Electrical resistivity; NO2 gas sensors
资金
- Department of Science and Technology (DST), New Delhi
- Indian National Academy of Science (INSA), New Delhi for DST INSPIRE FACULTY award [IFA-13 pH -61]
- UGC-DAE Consortium for Scientific Research (CSR), Indore through CRS project [CSR/Acctts/2015-16/81]
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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