Abstract
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.
Highlights
Nanotubes made of carbon and diverse inorganic compounds have continuously attracted significant attention due to their unique fundamental physical properties and many potential applications [1,2,3]
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
While employing a onestep solid-state reaction and the ZNW array templates, vertically aligned Zn2SiO4-SiOx core–shell nanotube arrays (ZSO), i.e., Zn2SiO4-nanoparticle chains encapsulated in SiOx nanotubes, SiOx-coated polycrystalline and singlecrystalline Zn2SiO4 coaxial nanotubes were simultaneously obtained
Summary
Nanotubes made of carbon and diverse inorganic compounds have continuously attracted significant attention due to their unique fundamental physical properties and many potential applications [1,2,3]. Abstract 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.
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