Enhanced photoluminescence of ZnO-SiO2 nanocomposite particles and the analyses of structure and composition |
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Authors: | Nobuhiro Hagura Shotaro Takayama Kikuo Okuyama |
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Institution: | a Department of Chemical Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-hiroshima 739 8527, Japan b Research Department, Kobe Fundamental Research Laboratory, Sumitomo Bakelite Co., Ltd., 1-1-5 Murotani Nishi-ku, Kobe 651 2241, Japan c Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132, Indonesia |
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Abstract: | Stable blue-green photoluminescent ZnO-SiO2 nanocomposite particles exhibiting quantum efficiency as high as 34.8% under excitation at 360 nm were prepared using a spray-drying process from a feed solution that contained both luminescent ZnO nanoparticles synthesized by a sol-gel method and commercially-available SiO2 nanoparticles. The effects of silica nanoparticle size and SiO2-to-ZnO concentration ratio on the PL properties of the composite particles were investigated. The internal structure and chemical composition were investigated in detail using elemental mapping, which revealed that ZnO nanoparticles were well-dispersed within silica nanoparticle matrix. At a LiOH concentration of 0.23 M, the predicted ZnO crystallite diameter before and after spray drying was approximately constant at 3.3 and 3.6 nm, respectively. This result indicates that ZnO particle growth was inhibited and therefore the PL property of ZnO nanoparticles was stably preserved in the composite. |
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Keywords: | Quantum dot Silica nanocomposite Photoluminescence Quantum efficiency |
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