Dynamic Raman Scattering Studies of Coated Gold Nanoparticles: 4-Mercaptopyridine, 4-Mercaptophenol, and Benzenethiol,The Journal of Physical Chemistry C

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Dynamic Raman Scattering Studies of Coated Gold Nanoparticles: 4-Mercaptopyridine, 4-Mercaptophenol, and Benzenethiol
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2016-05-18 00:00:00 , DOI: 10.1021/acs.jpcc.6b02617
Brandon L. Scott _{1,

2} , Keith T. Carron _{1,

3}

Affiliation

We have demonstrated several benefits of dynamic Raman scattering (DRS) measurements on coated gold nanoparticles. DRS examines particles moving in and out of a focused laser beam and uses statistical methods to determine unusual particles signals from the average particle response. In order to illustrate chemical enhancements within inaccessible particle gaps, we examined the pH dependence of 4-mercaptophenol, 4-mercaptopyridine, and benzenethiol. This study develops the methods of correlograms to visually display large data sets in a meaningful way to show trends in distributions and correlation between Raman features within a set of particles. Our correlograms demonstrate the correlations between Raman peaks within large data sets and illustrate which peaks may be involved in local chemical environments within a hotspot. The correlograms also provide clear proof of rare but stronger enhancing outlier particles. Principal component analysis (PCA) was used to extract the unusual particle signals from the average such that pH depended chemical effects could be determined. Both 4-mercaptopyrdine and 4-mercaptophenol exhibited pH dependence when examined by DRS. The variance between signals of the unusual events to the average was used to determine a rough estimate of the unusual particle enhancement as 150.

中文翻译：

涂层金纳米粒子的动态拉曼散射研究：4-巯基吡啶，4-巯基苯酚和苯硫酚

我们已经证明了在涂覆的金纳米颗粒上进行动态拉曼散射（DRS）测量的一些好处。DRS检查进入和离开聚焦激光束的粒子，并使用统计方法从平均粒子响应中确定异常粒子信号。为了说明在不可接近的颗粒间隙内的化学增强作用，我们检查了4-巯基苯酚，4-巯基吡啶和苯硫酚的pH依赖性。这项研究开发了相关图的方法，以有意义的方式直观地显示大型数据集，以显示一组粒子内拉曼特征之间的分布趋势和相关性。我们的相关图证明了大型数据集中的拉曼峰之间的相关性，并说明了哪些峰可能与热点内的局部化学环境有关。相关图还提供了稀有但更强的异常值颗粒的清晰证据。主成分分析（PCA）用于从平均值中提取异常颗粒信号，从而可以确定pH依赖的化学作用。当通过DRS检查时，4-巯基吡啶和4-巯基酚均显示出pH依赖性。异常事件信号与平均值之间的方差用于确定异常粒子增强的粗略估计为150。

更新日期：2016-05-18

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