Journal
CHEMISTRY OF MATERIALS
Volume 29, Issue 5, Pages 2355-2363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b00046
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Funding
- National Natural Science Foundation of China [21322105, 91323301, 51372025, 61505007, 51501010]
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Monodisperse nonepitaxially grown Au@MX (MX = Ag2S, ZnS, or CdS) core/shell hetero-nanocrystals (HNCs) with controlled crystallinity, composition, anisotropically shaped Au cores but isotropic overall morphologies were successfully prepared. By using C18 acid/alkali co-capping surface ligands, the as-prepared Au@MX HNCs can self assemble into large-scale two-dimensional monolayer and three-dimensional multilayer superlattices (SLs) on both flexible (graphene) and rigid (Si wafer or glass) substrates. Moreover, unprecedented binary nanocrystal SLs can be achieved through synergistic self-assembly of Au@MX HNCs together with Au NCs (or CdS NCs) into different intricate patterns. Experimental evidence and finite-element method theoretical simulations indicate that the Au@CdS HNC SL film taking up a closest-packing mode has a rate of photocurrent generation much higher than that of its disordered assembled counterpart, probably because of the enhanced plasmon-exciton coupling permitted by the large-scale ordered nanopatterning.
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