Controlled growth of high-quality TiO2 nanowires on sapphire and silica

Jung Chul Lee, Kyung Soo Park, Tae Geun Kim, Heon Jin Choi, Yun Mo Sung

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

The vapour-liquid-solid (VLS) growth of TiO2 nanowires (NWs) was performed using a thermally evaporated Ti source and sputter-deposited Au catalysts under an O2 gas flow. High-density single-crystalline TiO2 NWs having the rutile structure were successfully grown on sapphire (single-crystal α-Al2O3) and quartz (amorphous SiO2) substrates. Ti buffer layers, deposited on the substrates to prevent undesirable reactions between the Ti vapour and substrates, were identified to promote the TiO2 NW growth by providing supplementary Ti vapour to the Au catalysts. Crystallinity of TiO 2 NWs was investigated by x-ray diffraction (XRD) and their morphological features were characterized by field emission scanning electron microscopy (FESEM). High-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) analyses reveal growth of the rutile NWs having twofold twin structures along the growth direction on Ti/sapphire and the defect-free single-crystalline rutile NWs on Ti/quartz substrates. TiO 2 NWs grown on Ti/quartz showed a short-wavelength (∼402 nm) and high-intensity photoluminescence (PL) emission compared to those grown on Ti/sapphire substrates. By introducing a Ti buffer layer and using quartz substrates, the crystallinity and PL properties were successfully improved for VLS-grown TiO2 NWs.

Original languageEnglish
Article number006
Pages (from-to)4317-4321
Number of pages5
JournalNanotechnology
Volume17
Issue number17
DOIs
Publication statusPublished - 2006 Aug 1

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Controlled growth of high-quality TiO<sub>2</sub> nanowires on sapphire and silica'. Together they form a unique fingerprint.

  • Cite this