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Synthesis and Characterization of Monodispersed β-Ga2O3 Nanospheres via Morphology Controlled Ga4(OH)10SO4 Precursors

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† ‡ School of Advanced Materials Science and Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Republic of Korea
§ R&D Business Laboratories, Hyosung Corporation, Anyang 431-080, Republic of Korea
*Tel +82-31-290-7361; Fax +82-31-290-7410; e-mail [email protected] (D.H.Y.).
Cite this: Langmuir 2015, 31, 2, 833–838
Publication Date (Web):December 24, 2014
https://doi.org/10.1021/la504209f
Copyright © 2014 American Chemical Society

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    Abstract

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    To our best knowledge, monodispersed β-Ga2O3 nanospheres were successfully synthesized for first time via morphology-controlled gallium precursors using the forced hydrolysis method, followed by thermal calcination processes. The morphology and particle sizes of the gallium precursors were strongly dependent on the varying (R = SO42–/NO3) concentration ratios. As R decreased, the size of the prepared gallium precursors decreased and morphology was altered from sphere to rod. The synthesized S2 (R = 0.33) consists of uniform and monodispersed amorphous nanospheres with diameters of about 200 nm. The monodispersed β-Ga2O3 nanospheres were synthesized using thermal calcination processes at various temperatures ranging from 500 to 1000 °C. Monodispersed β-Ga2O3 nanospheres (200 nm) consist of small particles of approximately 10–20 nm with rough surface at 1000 °C for 1 h. The UV (375 nm) and broad blue (400–450 nm) emission indicate recombination via a self-trapped exciton and the defect band emission. Our approach described here is to show the exploration of β-Ga2O3 nanospheres as an automatic dispersion, three-dimensional support for fabrication of hierarchical materials, which is potentially important for a broad range of optoelectronic applications.

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    Tables summarizing experimental details for sample preparation, FESEM images, illustration of the demonstration and morphology evolution, PXRD, FTIR, and TG-DTA data of the gallium precursors, PXRD, FTIR, CL data and representative band-structure scheme for the UV and blue luminescence in β-Ga2O3 nanospheres. This material is available free of charge via the Internet at http://pubs.acs.org.

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