On the Role of Ascorbic Acid in the Synthesis of Single-Crystal Hyperbranched Platinum Nanostructures

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• 作者：Liang Wang ; Chunping Hu ; Yoshihiro Nemoto ; Yoshitaka Tateyama ; Yusuke Yamauchi
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：August 4, 2010
• 年：2010
• 卷：10
• 期：8
• 页码：3454-3460
• 全文大小：1037K
• 年卷期：v.10,no.8(August 4, 2010)
• ISSN：1528-7505

文摘

In this paper, a very simple and efficient wet chemical route is proposed to directly produce single-crystal hyperbranched platinum nanostructures (HPNSs), in high yield, within 10 min simply by sonication treatment of an aqueous solution containing K₂PtCl₄ and ascorbic acid (AA) only. The results in this report demonstrate that even in the absence of any purposely added structure-directing agent and seed mediator, reaction kinetics of AA and the released byproduct derived from AA oxidation, that is, 2,3-diketo-l-gulonic acid (DGA), are capable of producing single-crystal HPNSs in aqueous medium. In addition to being a commonplace reducing agent (electron donor), AA plays a more important role relied on its byproduct, DGA, which serves as a shape-directing agent to direct the branched growth. The new insight into the role of AA in the synthesis of single-crystal HPNSs reported here provides a new viewpoint for further understanding the formation mechanism of anisotropic platinum nanostructures.