期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201809146
关键词
hot electron transfer photoreaction; plasmonic nanoparticle arrays; surface-enhanced Raman scattering; uniform nanogaps; visible-light bacterial annihilation
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2017R1E1A1A01075141, NRF-2016R1D1A1B03932668]
- National Research Foundation of Korea [2017R1E1A1A01075141] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Monomeric gold (Au) and silver (Ag) nanoparticle (NP) arrays are self-assembled uniformly into anodized aluminium oxide (AAO) nanopores with a high homogeneity of greater than 95%, using ultrasonication. The monomeric metal NP array exhibits asymmetric plasmonic absorption due to Fano-like resonance as interpreted by finite-difference time-domain (FDTD) simulation for the numbers up to 127 AuNPs. To examine gap distance-dependent collective-plasmonic resonance, the different dimensions of S, M, and L arrays of the AuNP diameters/the gap distances of approximate to 36 nm/approximate to 66 nm, approximate to 45 nm/approximate to 56 nm, and approximate to 77 nm/approximate to 12 nm, respectively, are prepared. Metal NP arrays with an invariable nanogap of approximate to 50 nm can provide consistent surface-enhanced Raman scattering (SERS) intensities for Rhodamine 6G (Rh6G) with a relative standard deviation (RSD) of 3.8-5.4%. Monomeric arrays can provide an effective platform for 2D hot-electron excitation, as evidenced by the SERS peak-changes of 4-nitrobenzenethiol (4-NBT) adsorbed on AgNP arrays with a power density of approximate to 0.25 mW mu m(-2) at 514 and 633 nm. For practical purposes, the bacteria captured by 4-mercaptophenylboronic acid are found to be easily destroyed under visible laser excitation at 514 nm with a power density of approximate to 14 mW mu m(-2) for 60 min using Ag due to efficient plasmonic-electron transfer.
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