Direct SERS tracking of a chemical reaction at a single 13 nm gold nanoparticle
Direct SERS tracking of a chemical reaction at a single 13 nm gold nanoparticle
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直接 SERS 追踪单个 13 nm 金纳米粒子的化学反应
DOI：
10.1039/c8sc04496a
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发表时间：
2019-02-14
期刊：
影响因子：
8.4
通讯作者：
Liu, Baohong
中科院分区：
文献类型：
--
作者：
Zhang, Kun;Liu, Yujie;Liu, Baohong
缩小尺寸的金属纳米颗粒在能源和医学领域具有广阔的应用前景。然而，测量局部反应并同时获得单个小NPs的分子信息仍然是一个实验挑战。在这里，我们报道了表面增强拉曼光谱（SERS）原位跟踪单个13nm金NPs （GNPs）的催化反应。我们设计了空间隔离（bbb1.5 μ m的二聚体间空间）的GNP二聚体，每个GNP二聚体由两个尺寸分别为200 nm和13 nm的GNP组成。该设计将SERS和催化活性整合为一个整体，同时消除了相邻颗粒之间的串扰，这使我们能够首次在单个13 nm GNPs下追踪氧化还原衍生的光谱演变。我们还量化了每个个体GNP的反应动力学，并分析了多个GNPs的平均行为。不同粒子之间存在很大的可变性，这强调了单粒子分析的重要性。
Metal nanoparticles (NPs) with decreased sizes are promising catalysts in energy and medicine. Measuring the local reactions and simultaneously acquiring molecular insights at single small NPs, however, remain an experimental challenge. Here we report on surface-enhanced Raman spectroscopic (SERS) tracking of catalytic reactions of single 13 nm gold NPs (GNPs) in situ. We designed spatially isolated (> 1.5 mu m of inter-dimer space) GNP dimers, each of which consisted of two GNPs with sizes of similar to 200 and similar to 13 nm, respectively. This design integrates the SERS and catalytic activities into a single entity, while eliminating the crosstalk between adjacent particles, which allows us to trace the redox-derived spectral evolution at single 13 nm GNPs for the first time. We also quantified the reaction kinetics of each individual GNP and analyzed the average behavior of multiple GNPs. There is a large variability among different particles, which underscores the significance of single particle analysis.