Journal
RSC ADVANCES
Volume 7, Issue 2, Pages 678-683Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra26085c
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Funding
- JSPS [26288054, 15K17861]
- Grants-in-Aid for Scientific Research [26288054, 15K17861] Funding Source: KAKEN
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We report on the synthesis of nanosized single-crystalline spherical beta-Ga2O3 particles (GONP) by thermal annealing of gallium nanoparticles (GaNP), which previously has been prepared under ultrasonication. GONP displayed a spherical morphology and the particle size reflected that of GaNP. The nanoparticles have been confirmed crystalline beta-Ga2O3 by powder X-ray diffraction. The selected area electron diffraction patterns obtained from a whole particle of one GONP represented production of single-crystalline nanoparticle. Furthermore, the dispersibility and stability of GONP in solvent dramatically improved through silica coating (GO@SiO2 NP). Photoluminescence spectroscopy indicated that the GO@SiO2 NP exhibited a light blue emission at 445 nm under excitation at 240 nm. Diffuse reflectance spectroscopy demonstrated that the band gap of GO@SiO2 NP (E-g = 4.89 eV) was hypsochromically shifted compared to that of bulk Ga2O3 (E-g(bulk) = 4.56 eV) due to the quantum size effect of beta-Ga2O3. Additionally, silica particle-supported GONP (GONP/MCM-41) showed catalytic activity for the benzylation of benzene with benzyl chloride. Thus, the GONP presented here will have potential applications in LED phosphors, optoelectronic devices, and supported catalysts.
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