SnO2鈥揟iO2 Core鈥揝hell Nanowire Structures: Investigations on Solid State Reactivity and Photocatalytic Behavior

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• 作者：Jun Pan ; Sven-Martin Hu虉hne ; Hao Shen ; Lisong Xiao ; Philip Born ; Werner Mader ; Sanjay Mathur
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：September 8, 2011
• 年：2011
• 卷：115
• 期：35
• 页码：17265-17269
• 全文大小：939K
• 年卷期：v.115,no.35(September 8, 2011)
• ISSN：1932-7455

文摘

Two-step chemical vapor deposition (CVD) in combination with metal-catalyzed vapor鈥搇iquid鈥搒olid (VLS) growth mechanism was used as a new approach to synthesize and modify the morphology of SnO₂鈥揟iO₂ core鈥搒hell nanowires. SnO₂ nanowires were grown by decomposition of Sn(O^tBu)₄ precursor on Au-coated Al₂O₃ substrates followed by the growth of a TiO₂ overlayer by the CVD of Ti(OⁱPr)₄. Structural characterization of SnO₂鈥揟iO₂ heterostructures by X-ray diffraction and high-resolution TEM revealed the formation of mixed Sn_xTi_1鈥?i>xO₂ compositions (x = 0.857鈥?.0) at the SnO₂鈥揟iO₂ phase boundaries, where x depended on the annealing temperatures. The observed oriented attachment of TiO₂ nanoclusters on single crystal SnO₂ core was possibly due to low lattice mismatch. The photocatalytic studies suggested an enhanced activity in SnO₂鈥揟iO₂ heterostructures due to higher surface area and change in the electronic structures caused by Sn⁴⁺ doping in TiO₂.