期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 45, 期 42, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/45/42/425103
关键词
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资金
- University Grants Commission, Government of India
- Spanish Ministry of Science and Innovation
- EU-FEDER [MAT2007-66129, TEC2011-28076-C02-02]
- Generalitat Valenciana [Prometeo/2011-035, ISIC/2012/008]
ZnO nanoflowers were synthesized by the hydrothermal process at an optimized growth temperature of 200 degrees C and a growth/reaction time of 3 h. As-prepared ZnO nanoflowers were characterized by x-ray diffraction, scanning electron microscopy, UV-visible and Raman spectroscopy. X-ray diffraction and Raman studies reveal that the as-synthesized flower-like ZnO nanostructures are highly crystalline with a hexagonal wurtzite phase preferentially oriented along the (1 0 (1) over bar 1) plane. The average length (234-347 nm) and diameter (77-106 nm) of the nanorods constituting the flower-like structure are estimated using scanning electron microscopy studies. The band gap of ZnO nanoflowers is estimated as 3.23 eV, the lowering of band gap is attributed to the flower-like surface morphology and microstructure of ZnO. Room temperature photoluminescence spectrum shows a strong UV emission peak at 392 nm, with a suppressed visible emission related to the defect states, indicating the defect free formation of ZnO nanoflowers that can be potentially used for UV light-emitting devices. The suppressed Raman bands at 541 and 583 cm(-1) related to defect states in ZnO confirms that the ZnO nanoflowers here obtained have a reduced presence of defects.
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