Heteroepitaxy of SnO2 Nanowire Arrays on TiO2 Single Crystals: Growth Patterns and Tomographic Studies

Oriented SnO2 nanowire (NW) arrays were grown on TiO2(001) substrates by molecule-based chemical vapor deposition of Sn(OtBu)4. Preferred growth directions ([101], [−101], [011], and [0–11]) of SnO2 NWs were correlated to surface energy consideration and crystallographic relationship between the sub...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2011-08, Vol.115 (31), p.15191-15197
Main Authors: Pan, Jun, Shen, Hao, Werner, Ulf, Prades, Joan Daniel, Hernandez-Ramirez, Francisco, Soldera, Flavio, Mücklich, Frank, Mathur, Sanjay
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
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Summary:Oriented SnO2 nanowire (NW) arrays were grown on TiO2(001) substrates by molecule-based chemical vapor deposition of Sn(OtBu)4. Preferred growth directions ([101], [−101], [011], and [0–11]) of SnO2 NWs were correlated to surface energy consideration and crystallographic relationship between the substrate and NW material by comprehensive electron microscopy and bulk tomographic studies. The proposed growth incubation model (tilting of catalyst/NW interface due to driving force of surface energy) explains the formation mechanism of oriented SnO2 NWs on TiO2 substrates. These results allowed us to also study the I–V characteristics and gas-sensing properties of individual SnO2 NWs grown with a perfectly defined crystal orientation ([101]).
ISSN:1932-7447
1932-7455
DOI:10.1021/jp202685a