Unconventional assembly of bimetallic Au-Ni janus nanoparticles on chemically modified silica spheres

Lei Jia, Xiaowei Pei, Feng Zhou, Weimin Liu

科研成果: 期刊稿件文章同行评审

6 引用 (Scopus)

摘要

This paper reports that Janus AuNi nanoparticles (JANNPs) can self-assemble onto silica spheres in a novel way, which is different from that of single-component isotropic nanoparticles. JANNPs modified with octadecylamine (ODA) assemble onto catechol-modified silica spheres (SiO2OH) to form a very special core-loop complex structure and finally the core-loop assemblies link each other to form large assemblies through capillary force and the hydrophobic interaction of the alkyl chains of ODA. The nanocomposites disassemble in the presence of vanillin and oleic acid because of the breakage of the catechol-metal link. Vanillin-induced disassembly enables the JANNPs to reassemble into a core-loop structure upon ODA addition. The assembly of SiO2ï£ ¿OH and isotropic Ni or Fe3O4 particles generates traditional core-satellite structures. This unconventional self-assembly can be attributed to the synergistic effect of Janus specificity and capillary force, which is also confirmed by the assembly of thiol-terminated silica spheres (SHSiO2) with anisotropic JANNPs, isotropic Au, and Ni nanoparticles. These results can guide the development of novel composite materials using Janus nanoparticles as the primary building blocks.

源语言英语
页(从-至)2065-2070
页数6
期刊Chemistry - A European Journal
20
7
DOI
出版状态已出版 - 10 2月 2014
已对外发布

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