Synthesis of Au in Ga₂O₃ peapodded nanorods and their photoluminescence properties

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• 作者：Changhyun Jin ; Hyunsu Kim ; Soyeon An ; Chongmu Lee ; ^{cmlee@inha.ac.kr}
• 关键词：Ga2O3 nanorods ; Gold-peapodded gallium oxide (Ga2O3) ; Photoluminescence ; Thermal annealing
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 May, 2012
• 卷：191
• 期：Complete
• 页码：457-462
• 文件大小：1245 K

摘要

Gold (Au) in gallium oxide (Ga₂O₃) peapodded one-dimensional (1D) nanostructures were synthesized by thermal evaporation of GaN powders on Si (1 0 0) substrates coated with Au thin films followed by annealing. At the initial stages of annealing, Au formed a continuous linear core located along the long axis of each Ga₂O₃ nanorod. The morphology of the Au core changed from a continuous line to a discrete line, and then to a droplet-like chain, finally evolving into a peapod in which crystalline Au nanoparticles were encapsulated in crystalline Ga₂O₃ with increasing annealing temperature. The Ga₂O₃ nanorods with the Au core showed an emission band at 鈭?10 nm in the violet region. The violet emission intensity increased rapidly with increasing annealing temperature. The intensity of emission from the Au in Ga₂O₃ pepodded nanorods (annealed at 800 掳C) was approximately six times higher than that of the emission from the Au-core/Ga₂O₃-shell nanorods with a continuous linear shaped-Au core (annealed at 600 掳C). This intense violet emission from the core-shell nanorods annealed at 800 掳C might have originated mainly from the surface plasmon resonance (SPR) of Au-peapods whereas the less intense violet emission from the core-shell nanorods annealed at 600 or 700 掳C might have originated mainly from the band-to-band transition of the Ga₂O₃ shells.