DNA-Directed Assembly of Gold Nanohalo for Quantitative Plasmonic Imaging of Single-Particle Catalysis
DNA-Directed Assembly of Gold Nanohalo for Quantitative Plasmonic Imaging of Single-Particle Catalysis
复制标题
DNA 定向组装金纳米晕用于单颗粒催化定量等离激元成像
DOI：
10.1021/jacs.5b00324
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发表时间：
2015-04-08
影响因子：
15
通讯作者：
Fan, Chunhai
中科院分区：
文献类型：
--
作者：
Li, Kun;Wang, Kun;Fan, Chunhai
暗场显微镜 (DFM) 下的等离子成像对于生物成像、纳米光子学和纳米催化中的单粒子分析具有广阔的前景。在这里，我们设计了一种DNA引导的可编程组装策略来制造光环状金纳米结构（nanohalo），该结构将等离子体大金纳米粒子（L-AuNPs）与催化活性小金纳米粒子（S-AuNPs）耦合在单个纳米结构中。 S-AuNPs 上发生的催化反应改变了其介电常数，从而导致纳米晕的等离子体共振发生显着变化。因此，我们可以在DFM下间接监测单个纳米晕的催化反应，在此基础上我们获得了纳米催化和催化剂中毒的定量信息。因此，我们的研究为在单颗粒水平上定量研究金属纳米粒子催化提供了一种经济有效的方法。
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.