Journal
NANOSCALE
Volume 11, Issue 29, Pages 13917-13923Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr03590g
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Funding
- National Natural Science Foundation of China [51525302, 51703072]
- Key R&D Program of Ministry of Science and Technology [2018YFA0209200]
- China postdoctoral science foundation [2017M612436]
- Open Research Fund of State Key Lab of Polym Phys Chem
- CIAC, CAS [2017-27]
- Program for HUST Academic Frontier Youth Team [2015-01]
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Taking into account the near-field coupling interaction, non-close-packed two-dimensional nanoparticle (NP) assemblies with centimeter-scale and tunable interparticle gap (d) have attracted considerable attention due to their remarkable physicochemical properties, which show a wide range of potential applications, e.g., surface-enhanced Raman spectroscopy (SERS) active substrates. In the present work, we demonstrate that an Au NP superlattice monolayer (SM) with tunable d, playing a critical role in governing SERS activity, can be created via a rapid liquid-liquid interfacial assembly strategy. We show that the enhancement factor (EF) of SERS has an approximate 1/d(2.4) dependence on the gap of Au NP SM assemblies. This work provides a platform for the rational design of plasmon-enhanced spectroscopy active substrates for theoretical studies and for various applications, including SERS-active substrates, photoelectronic devices, biosensors and others.
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