Patterned Growth of TiO2 Nanowires on Titanium Substrates
Single-crystalline rutile TiO 2 nanowires (NWs) were synthesized by the vapor--liquid--solid (VLS) method on Ti foil substrates patterned with catalytic Sn nano-islands. NWs of 3 to 8 μm in length and 50 to 500 nm in diameter were grown along the [$1\bar{1}0$] axis exhibiting a rectangular cross sec...
Saved in:
| Published in | Applied physics express Vol. 4; no. 6; pp. 065002 - 065002-3 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
The Japan Society of Applied Physics
01.06.2011
|
| Online Access | Get full text |
Cover
Loading…
| Summary: | Single-crystalline rutile TiO 2 nanowires (NWs) were synthesized by the vapor--liquid--solid (VLS) method on Ti foil substrates patterned with catalytic Sn nano-islands. NWs of 3 to 8 μm in length and 50 to 500 nm in diameter were grown along the [$1\bar{1}0$] axis exhibiting a rectangular cross section with the (001) and (110) side facets. This facile approach to TiO 2 NW fabrication with fast induction heating and short processing time utilizes the Ti foil both as a substrate and as a metal supply, thus eliminating the need for a separate titanium source. |
|---|---|
| Bibliography: | Plan-view SEM image of periodic array of TiO 2 NWs fabricated on Ti foil. The Sn-based cap is clearly visible atop the NW (marked with arrow) in the inset, indicating the VLS growth mechanism. (a) SEM image, (b) and (c) corresponding EBSD patterns of the TiO 2 NW and catalytic Sn cap, respectively. Insets in diffraction patterns (b) and (c) are simulated crystallographic orientations of TiO 2 and Sn unit cells, respectively. XRD pattern of TiO 2 NWs on Ti substrate. Rutile peaks (filled squares) correspond to both NWs and the TiO 2 layer formed on the substrate (see "layer A" in Fig. ). Sn peaks (filled circles) correspond to catalytic metal caps residing atop NWs. Ti 1-x O x peaks (open circles) are from the oxidized titanium substrate ("layer B" in Fig. ). (a) SEM perspective view of sample from Fig. : TiO 2 NWs grow on "layer A", which delaminated from "layer B" (note that NWs were partially removed for a clear view of surfaces and interfaces); (b) close-up view of NW with arrow pointing to Sn-cap; (c) and (d) EBSD patterns of "layer A" (TiO 2 ) and "layer B" (Ti 1-x O x ), respectively. Schematic diagram of the TiO 2 NW growth on Ti foil. For the NW growth, which occurs via the VLS mechanism, Ti-containing gas species are supplied by the foil itself, while oxygen is supplied by residual O 2 from the carrier gas. In addition to the NW growth, a 1-μm-thick polycrystalline TiO 2 layer ("layer A") forms on top of the partially oxidized Ti 0.81 O 0.19 layer ("layer B"). |
| ISSN: | 1882-0778 1882-0786 |
| DOI: | 10.1143/APEX.4.065002 |