Synthesis and Characterization of Flower-like Bundles of ZnO Nanosheets by a Surfactant-free Hydrothermal Process
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Date
2014-12-22Author
Qiu, Jijun
Weng, Binbin
Zhao, Lihua
Chang, Caleb
Shi, Zhisheng
Li, Xiaomin
Kim, Hyung-Kook
Hwang, Yoon-Hwae
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Flower-like bundles of ZnO nanosheets have been prepared by using preheating hydrothermal process without any surfactants. The flower-like bundles consist of many thin and uniform hexagonal-structured ZnO nanosheets, with a thickness of 50 nm. The selected area electronic diffraction (SAED) and high-resolution transmission electron microscope (HRTEM) images indicate that the ZnO nanosheets are single crystal in nature. The growth mechanism of the flower-like bundles of ZnO nanosheets is discussed based on the morphology evolution with growth times and reaction conditions. It is believed that the formation of flower-like bundles of ZnO nanosheets is related to the shielding effect of OH− ions and the self-assembly process, which is dominated by a preheating time. Room temperature photoluminescence spectra results show that the annealing atmosphere strongly affects the visible emission band, which is sensitive to intrinsic and surface defects, especially oxygen interstitials, in flower-like bundles of ZnO nanosheets.
Citation
Qiu, Jijun, et al. (2014) Synthesis and Characterization of Flower-like Bundles of ZnO Nanosheets by a Surfactant-free Hydrothermal Process. Journal of Nanomaterials, V. 2014.
Sponsorship
This work was supported by the Korea Research Foundation Grants (KRF-2006-005-J02802 and KRF-2006-005-J02803). This work was also supported by the Korea Science and Engineering Foundation (KOSEF, R01-000-20757-0) Grant funded by the Korean government.