%0 Journal Article
%T Effect of Size-Dependent Thermal Instability on Synthesis of Zn2 SiO4-SiOx Core¨CShell Nanotube Arrays and Their Cathodoluminescence Properties
%A Li Chun
%A Bando Yoshio
%A Dierre Benjamin
%A Sekiguchi Takashi
%J Nanoscale Research Letters
%D 2010
%I Springer
%X Vertically aligned Zn2SiO4-SiOx(x < 2) core¨Cshell 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.
%K Nano-template
%K Core¨Cshell nanotube
%K Cathodoluminescence
%K Zinc Silicate
%K Rayleigh instability
%K Kirkendall effect
%U http://dx.doi.org/10.1007/s11671-010-9556-7