Nano Express

Nanoscale Research Letters

, Volume 5, Issue 4, pp 773-780

Open Access This content is freely available online to anyone, anywhere at any time.

Effect of Size-Dependent Thermal Instability on Synthesis of Zn2SiO4-SiO x Core–Shell Nanotube Arrays and Their Cathodoluminescence Properties

  • Chun LiAffiliated withWorld Premier International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science Email author 
  • , Yoshio BandoAffiliated withWorld Premier International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science
  • , Benjamin DierreAffiliated withAdvanced Electronic Materials Center, National Institute for Materials Science (NIMS)
  • , Takashi SekiguchiAffiliated withAdvanced Electronic Materials Center, National Institute for Materials Science (NIMS)
  • , Yang HuangAffiliated withWorld Premier International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science
  • , Jing LinAffiliated withWorld Premier International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science
  • , Dmitri GolbergAffiliated withWorld Premier International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science

Abstract

Vertically aligned Zn2SiO4-SiO x (x < 2) core–shell nanotube arrays consisting of Zn2SiO4-nanoparticle chains encapsulated into SiO x nanotubes and SiO x -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-SiO x coaxial nanotubes, single-crystalline Zn2SiO4-nanoparticle-chain-embedded SiO x nanotubes, and single-crystalline Zn2SiO4-SiO x 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.

Keywords

Nano-template Core–shell nanotube Cathodoluminescence Zinc Silicate Rayleigh instability Kirkendall effect