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 language | English |
|---|---|
| Article number | 006 |
| Pages (from-to) | 4317-4321 |
| Number of pages | 5 |
| Journal | Nanotechnology |
| Volume | 17 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2006 Aug 1 |
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ASJC Scopus subject areas
- Bioengineering
- Chemistry(all)
- Electrical and Electronic Engineering
- Mechanical Engineering
- Mechanics of Materials
- Materials Science(all)
Cite this
Controlled growth of high-quality TiO2 nanowires on sapphire and silica. / Lee, Jung Chul; Park, Kyung Soo; Kim, Tae Geun; Choi, Heon Jin; Sung, Yun Mo.
In: Nanotechnology, Vol. 17, No. 17, 006, 01.08.2006, p. 4317-4321.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Controlled growth of high-quality TiO2 nanowires on sapphire and silica
AU - Lee, Jung Chul
AU - Park, Kyung Soo
AU - Kim, Tae Geun
AU - Choi, Heon Jin
AU - Sung, Yun Mo
PY - 2006/8/1
Y1 - 2006/8/1
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=34547886701&partnerID=8YFLogxK
U2 - 10.1088/0957-4484/17/17/006
DO - 10.1088/0957-4484/17/17/006
M3 - Article
VL - 17
SP - 4317
EP - 4321
JO - Nanotechnology
JF - Nanotechnology
SN - 0957-4484
IS - 17
M1 - 006
ER -