期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 13, 页码 4292-4295出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b00324
关键词
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资金
- National Basic Research Program of China (973 program) [2013CB932803, 2012CB825800, 2013CB933800]
- NSFC [21222508, 3108JC1422600, 21329501, 61378062, 21390414, 91313302]
- Shanghai Municipal Commission for Science and Technology [13QH1402300]
- Youth Innovation Promotion Association, CAS
Plasmonic imaging under a dark-field microscope (DFM) holds great promise for single-particle analysis in bioimaging, nanophotonics, and nanocatalysis. Here, we designed a DNA-directed programmable assembly strategy to fabricate a halo-like Au nanostructure (nanohalo) that couples plasmonic large gold nanoparticles (L-AuNPs) with catalytically active small AuNPs (S-AuNPs) in a single nanoarchitecture. Catalytic reaction occurring on S-AuNPs changes its permittivity, which results in a significant variation of the plasmonic resonance of the nanohalo. Hence, we can indirectly monitor catalytic reactions on a single nanohalo under DFM, on the basis of which we have obtained quantitative information on both nanocatalysis and catalyst poisoning. Our study thus provides a cost-effective means to quantitatively study metal NP-based catalysis at single-particle level.
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