Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 5, Pages 1728-1734Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201503297
Keywords
aggregation; capping layer; coordination modes; cross-linkers; nanoparticles; surfaces
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Funding
- Helen and Martin Kimmel Center for Molecular Design
- Israel Science Foundation (ISF)
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The immobilization of metal nanoparticles (NPs) with molecular control over their organization is challenging. Herein, we report the formation of molecularly cross-linked AuNP assemblies using a layer-by-layer approach. We observed four types of assemblies: 1) small aggregates of individual AuNPs, 2) large aggregates of individual AuNPs, 3) networks of fused AuNPs, and 4) gold islands. Interestingly, these assemblies with the different cross-linkers and capping layers represent different stages in the complete fusion of AuNPs to afford islands of continuous gold. We demonstrate that the stability toward fusion of the nanoparticles of the on-surface structures can be controlled by the reactivity of the cross-linkers and the hydrophilicity/ hydrophobicity of the nanoparticles.
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