Modulating the hierarchical fibrous assembly of Au nanoparticles with atomic precision

Qi Li, Jake C. Russell, Tian-Yi Luo, Xavier Roy, Nathaniel L. Rosi, Yan Zhu () and Rongchao Jin ()
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Qi Li: Carnegie Mellon University
Jake C. Russell: Columbia University
Tian-Yi Luo: University of Pittsburgh
Xavier Roy: Columbia University
Nathaniel L. Rosi: University of Pittsburgh
Yan Zhu: Nanjing University
Rongchao Jin: Carnegie Mellon University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract The ability to modulate nanoparticle (NP) assemblies with atomic precision is still lacking, which hinders us from creating hierarchical NP organizations with desired properties. In this work, a hierarchical fibrous (1D to 3D) assembly of Au NPs (21-gold atom, Au21) is realized and further modulated with atomic precision via site-specific tailoring of the surface hook (composed of four phenyl-containing ligands with a counteranion). Interestingly, tailoring of the associated counterion significantly changes the electrical transport properties of the NP-assembled solids by two orders of magnitude due to the altered configuration of the interacting π–π pairs of the surface hooks. Overall, our success in atomic-level modulation of the hierarchical NP assembly directly evidences how the NP ligands and associated counterions can function to guide the 1D, 2D, and 3D hierarchical self-assembly of NPs in a delicate manner. This work expands nanochemists’ skills in rationally programming the hierarchical NP assemblies with controllable structures and properties.

Date: 2018
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DOI: 10.1038/s41467-018-06395-8

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