Epitaxial Electrodeposition of ZnO on Au(111) from Alkaline Solution: Exploiting Amphoterism in Zn(II)

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• 作者：Steven J. Limmer ; Elizabeth A. Kulp ; Jay A. Switzer
• 刊名：Langmuir
• 出版年：2006
• 出版时间：December 5, 2006
• 年：2006
• 卷：22
• 期：25
• 页码：10535 - 10539
• 全文大小：357K
• 年卷期：v.22,no.25(December 5, 2006)
• ISSN：1520-5827

文摘

The amphoteric nature of ZnO is used to produce the material from strongly alkaline solution. The solution pHis lowered globally to produce ZnO powder, and it is lowered locally at a Au(111) surface to produce epitaxial films.ZnO powder is precipitated from a solution of 10 mM Zn(II) in 0.25 M NaOH by simply adding 1 M HNO₃ to thesolution. For the film electrodeposition, the local pH at the electrode surface is decreased by electrochemicallyoxidizing the ascorbate dianion. The chemically precipitated ZnO powder grows with a sea urchin-like nanostructure,whereas the electrodeposited films have a columnar structure. ZnO electrodeposited onto a Au(111) single crystal hasa ZnO(0001)[101]//Au(111)[10] orientation relationship.