Effect of Size-Dependent Thermal Instability on Synthesis of Zn2 SiO4-SiOx Core-Shell Nanotube Arrays and Their Cathodoluminescence Properties.
Effect of Size-Dependent Thermal Instability on Synthesis of Zn2 SiO4-SiOx Core-Shell Nanotube Arrays and Their Cathodoluminescence Properties.
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DOI：
10.1007/s11671-010-9556-7
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发表时间：
2010-02-10
影响因子：
--
通讯作者：
Golberg, Dmitri
中科院分区：
文献类型：
--
作者：
Li, Chun;Bando, Yoshio;Dierre, Benjamin;Sekiguchi, Takashi;Huang, Yang;Lin, Jing;Golberg, Dmitri
关键词：
以ZnO纳米线（ZNW）阵列为模板，采用一步热退火法制备了由ZnO纳米线链包裹在SiOx纳米管中和SiOx包覆Zn 2SiO 4同轴纳米管组成的Zn 2SiO 4-SiOx（x < 2）核壳结构纳米管阵列。不同的纳米管形貌的外观是由于尺寸依赖性的热不稳定性和特定的熔化的ZNW。随着纳米线直径的增加，纳米线的形成机制从“刻蚀”分解到Rayleigh不稳定再到Kirkendall效应，最终形成了多晶Zn 2SiO 4-SiOx同轴纳米管、单晶Zn 2SiO 4-纳米颗粒链嵌入式SiOx纳米管和单晶Zn 2SiO 4-SiOx同轴纳米管。与特定形态相关的空间分辨光学性质的差异通过阴极发光（CL）光谱法有效地记录，该光谱法使用来自Zn 2SiO 4相的在310 nm处的中紫外发射。
Vertically aligned Zn2SiO4-SiOx(x < 2) core–shell nanotube arrays consisting of Zn2SiO4-nanoparticle chains encapsulated into SiOx nanotubes and SiOx-coated Zn2SiO4 coaxial nanotubes were synthesized via one-step thermal annealing process using ZnO nanowire (ZNW) arrays as templates. The appearance of different nanotube morphologies was due to size-dependent thermal instability and specific melting of ZNWs. With an increase in ZNW diameter, the formation mechanism changed from decomposition of “etching” to Rayleigh instability and then to Kirkendall effect, consequently resulting in polycrystalline Zn2SiO4-SiOx coaxial nanotubes, single-crystalline Zn2SiO4-nanoparticle-chain-embedded SiOx nanotubes, and single-crystalline Zn2SiO4-SiOx coaxial nanotubes. The difference in spatially resolved optical properties related to a particular morphology was efficiently documented by means of cathodoluminescence (CL) spectroscopy using a middle-ultraviolet emission at 310 nm from the Zn2SiO4 phase.
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