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

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• 作者：Jun Pan ; Hao Shen ; Ulf Werner ; Joan Daniel Prades ; Francisco Hernandez-Ramirez ; Flavio Soldera ; Frank Mu虉cklich ; Sanjay Mathur
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 11, 2011
• 年：2011
• 卷：115
• 期：31
• 页码：15191-15197
• 全文大小：1019K
• 年卷期：v.115,no.31(August 11, 2011)
• ISSN：1932-7455

文摘

Oriented SnO₂ nanowire (NW) arrays were grown on TiO₂(001) substrates by molecule-based chemical vapor deposition of Sn(O^tBu)₄. Preferred growth directions ([101], [鈭?01], [011], and [0鈥?1]) 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鈥?i>V characteristics and gas-sensing properties of individual SnO₂ NWs grown with a perfectly defined crystal orientation ([101]).