Synthesis of Pd−Au Bimetallic Nanocrystals via Controlled Overgrowth

This paper describes the synthesis of Pd−Au bimetallic nanocrystals with controlled morphologies via a one-step seeded-growth method. Two different reducing agents, namely, l-ascorbic acid and citric acid, were utilized for the reduction of HAuCl4 in an aqueous solution to control the overgrowth of...

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Bibliographic Details
Published inJournal of the American Chemical Society Vol. 132; no. 8; pp. 2506 - 2507
Main Authors Lim, Byungkwon, Kobayashi, Hirokazu, Yu, Taekyung, Wang, Jinguo, Kim, Moon J, Li, Zhi-Yuan, Rycenga, Matthew, Xia, Younan
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 03.03.2010
Subjects
Crystallization - methods
Gold - chemistry
Nanoparticles - chemistry
Nanoparticles - ultrastructure
Nanotechnology - methods
Palladium - chemistry
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Summary:This paper describes the synthesis of Pd−Au bimetallic nanocrystals with controlled morphologies via a one-step seeded-growth method. Two different reducing agents, namely, l-ascorbic acid and citric acid, were utilized for the reduction of HAuCl4 in an aqueous solution to control the overgrowth of Au on cubic Pd seeds. When l-ascorbic acid was used as the reducing agent, conformal overgrowth of Au on the Pd nanocubes led to the formation of Pd−Au nanocrystals with a core−shell structure. On the contrary, localized overgrowth of Au was observed when citric acid was used as the reducing agent, producing Pd−Au bimetallic dimers. Through this morphological control, we were able to tune the localized surface plasmon resonance peaks of Pd−Au bimetallic nanostructures in the visible region.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja909787h