A welding phenomenon of dissimilar nanoparticles in dispersion

Zhiqi Huang, Zhi-Jian Zhao, Qian Zhang, Lili Han, Xiumei Jiang, Chao Li, Maria T. Perez Cardenas, Peng Huang, Jun-Jie Yin, Jun Luo, Jinlong Gong () and Zhihong Nie ()
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Zhiqi Huang: Tianjin University
Zhi-Jian Zhao: Tianjin University
Qian Zhang: University of Maryland
Lili Han: Tianjin University of Technology
Xiumei Jiang: U.S. Food and Drug Administration
Chao Li: Tianjin University of Technology
Maria T. Perez Cardenas: University of Maryland
Peng Huang: Shenzhen University
Jun-Jie Yin: U.S. Food and Drug Administration
Jun Luo: Tianjin University of Technology
Jinlong Gong: Tianjin University
Zhihong Nie: University of Maryland

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The oriented attachment of small nanoparticles (NPs) is recognized as an important mechanism involved in the growth of inorganic nanocrystals. However, non-oriented attachment of dissimilar NPs has been rarely observed in dispersion. This communication reports a welding phenomenon occurred directly between as-synthesized dispersions of single-component Au and chalcogenide NPs, which leads to the formation of asymmetric Au-chalcogenide hybrid NPs (HNPs). The welding of dissimilar NPs in dispersion is mainly driven by the ligand desorption-induced conformal contact between NPs and the diffusion of Au into chalcogenide NPs. The welding process can occur between NPs with distinct shapes or different capping agents or in different solvent media. A two-step assembly-welding mechanism is proposed for this process, based on our in situ electron spin resonance measurements and ab initio molecular dynamics simulation. The understanding of NP welding in dispersion may lead to the development of unconventional synthetic tools for the fabrication of hybrid nanostructures with diverse applications.

Date: 2019
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DOI: 10.1038/s41467-018-08206-6

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