Facile methods for synthesis of core-shell structured and heterostructured Fe₃O₄@Au nanocomposites

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• 作者：Lei Lou ; Ke Yu ; Zhengli Zhang ; Rong Huang ; Yiting Wang ; Ziqiang Zhu
• 关键词：62.23.Pq ; 75.50.Gg ; 81.05.Bx ; 61.41.+e ; 74.25.Ha
• 刊名：Applied Surface Science
• 出版年：2012
• 出版时间：1 September, 2012
• 年：2012
• 卷：258
• 期：22
• 页码：8521-8526
• 全文大小：1736 K

文摘

Two different reaction strategies designed for core-shell structured and heterostructured Fe₃O₄@Au nanocomposites utilizing 50 nm polyethyleneimine coated magnetite as seeds are presented aiming at diverse applications. The polyethylenimine (PEI) coated Fe₃O₄ nanoparticles were firstly used as seeds to carry out the synthesis of both core-shell structured and heterostructured Fe₃O₄@Au nanocomposites. Results show that these two structures combined the merits of both gold and Fe₃O₄ nanoparticles. What is more, the distinct morphology offers diverse applications: the shell of dense gold nanoparticles coating in the core-shell structure dominates the further surface functionalization while the heterostructure offers the particles with two distinct surfaces and functionalities due to different surfactant molecules on the surface of Fe₃O₄ and Au nanoparticles. Furthermore, the synthesis methods presented in this paper also suggested new ways to the synthesis of multifunctional nanostructures.