Colloidal Hybrid Nanoparticle Insertion Reaction for Transforming Heterodimers into Heterotrimers

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• 作者：Carlos G. Read ; Thomas R. Gordon ; James M. Hodges ; Raymond E. Schaak
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：October 7, 2015
• 年：2015
• 卷：137
• 期：39
• 页码：12514-12517
• 全文大小：342K
• ISSN：1520-5126

文摘

Three-component colloidal hybrid nanoparticles, which are central to a diverse array of applications, are typically synthesized using successive seeded growth steps, which are additive in nature and driven by surface chemistry considerations and material-specific preferences for nucleation and growth. Here, we describe a new nanoparticle insertion reaction for transforming heterodimers into heterotrimers, which is based on a supersaturation鈥損recipitation pathway that shifts the driving force for heterotrimer formation away from surface-driven nucleation and growth. To demonstrate the concept, a Ge segment is inserted between the Au and Fe<sub>3sub>O<sub>4sub> domains of Au鈥揊e<sub>3sub>O<sub>4sub> heterodimers to form Au鈥揋e鈥揊e<sub>3sub>O<sub>4sub> heterotrimers. Microscopic investigations reveal important mechanistic insights, including identification of a proposed Au鈥揋e鈥揂u鈥揊e<sub>3sub>O<sub>4sub> intermediate. The process can be modified to access the analogous addition product Ge鈥揂u鈥揊e<sub>3sub>O<sub>4sub>, allowing tuning between two distinct heterotrimer isomers with different configurations.