title: DNA-directed assembly of gold nanohalo for quantitative plasmonic imaging of single-particle catalysis.
abstract: 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.
authors: Kun
authors: K
authors: Li
authors: Kun
authors: K
authors: Wang
authors: Weiwei
authors: W
authors: Qin
authors: Suhui
authors: S
authors: Deng
authors: Di
authors: D
authors: Li
authors: ‡UCB Pharma, Slough, SL1 14EN Berkshire, U.K.
authors: Jiye
authors: J
authors: Shi
authors: Qing
authors: Q
authors: Huang
authors: Chunhai
authors: C
authors: Fan
mesh_terms: D002384:Catalysis; D004247:DNA / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008853:Microscopy / Q000379:methods*
chemical_list: D006046:Gold; D004247:DNA