Investigating the Multiple Roles of Polyvinylpyrrolidone for a General Methodology of Oxide Encapsulation

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• 作者：Hang Sun ; Jiating He ; Jiangyan Wang ; Shuang-Yuan Zhang ; Cuicui Liu ; Thirumany Sritharan ; Subodh Mhaisalkar ; Ming-Yong Han ; Dan Wang ; Hongyu Chen
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：June 19, 2013
• 年：2013
• 卷：135
• 期：24
• 页码：9099-9110
• 全文大小：675K
• 年卷期：v.135,no.24(June 19, 2013)
• ISSN：1520-5126

文摘

Growing oxide shells on seed nanoparticles requires the control of several processes: (a) the nucleation and growth of the shell material; (b) the 鈥渨etting鈥?of the shell material on the seeds; and (c) the aggregation of the nanoparticles. These processes are influenced by a number of factors, many of which are related. Without understanding the interdependence of these contributing factors, it is difficult to circumvent problems and achieve rational synthesis. We first did a case study on encapsulating Au nanoparticles with ZnO to understand the multiple roles of polyvinylpyrrolidone (PVP) and their dependence on other factors. We developed a general method for coating ZnO on a variety of seeds, including metals, oxides, polymer nanoparticles, graphene oxide, and carbon nanotube. This method can be further extended to include Fe₃O₄, MnO, Co₂O₃, TiO₂, Eu₂O₃, Tb₂O₃, Gd₂O₃, 尾-Ni(OH)₂, ZnS, and CdS as the shell materials. The understanding obtained in this systematic study will aid rational design and synthesis of other core鈥搒hell nanostructures.