Dynamic Raman Scattering Studies of Coated Gold Nanoparticles: 4-Mercaptopyridine, 4-Mercaptophenol, and Benzenethiol
Dynamic Raman Scattering Studies of Coated Gold Nanoparticles: 4-Mercaptopyridine, 4-Mercaptophenol, and Benzenethiol
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DOI：
10.1021/acs.jpcc.6b02617
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发表时间：
2016-05
影响因子：
3.7
通讯作者：
B. Scott;K. Carron
中科院分区：
文献类型：
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作者：
B. Scott;K. Carron
我们已经证明了几个好处的动态拉曼散射（DRS）测量涂层金纳米粒子。DRS检查在聚焦激光束中进出的粒子，并使用统计方法从平均粒子响应中确定不寻常的粒子信号。为了说明化学增强不可接近的颗粒间隙内，我们研究了pH值的依赖性的4-巯基苯酚，4-巯基吡啶，和苯乙胺。本研究发展了相关图的方法，以一种有意义的方式直观地显示大数据集，以显示一组粒子内拉曼特征之间的分布和相关性的趋势。我们的相关图展示了大数据集内拉曼峰之间的相关性，并说明了哪些峰可能涉及热点内的局部化学环境。相关图还提供了罕见但更强的增强离群粒子的明确证据。采用主成分分析（PCA）方法提取颗粒物中的异常颗粒物信号。
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...