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首页> 外文期刊>Physical chemistry chemical physics: PCCP >In situ identification of crystal facet-mediated chemical reactions on tetrahexahedral gold nanocrystals using surface-enhanced Raman spectroscopy
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In situ identification of crystal facet-mediated chemical reactions on tetrahexahedral gold nanocrystals using surface-enhanced Raman spectroscopy

机译：使用表面增强拉曼光谱法以晶壳介导的晶型介导的化学反应的原位鉴定

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摘要

Direct monitoring of a metal-catalyzed reaction by surface-enhanced Raman scattering (SERS) is always a challenging issue as it needs bifunctional metal structures that have plasmonic properties and also act as catalysts. Here we demonstrate that the tetrahexahedral (THH) gold nanocrystals (Au NCs) with exposed {520} facets give highly enhanced Raman signals from molecules at the interface, permitting in situ observation of chemical transformation from para-aminothiophenol (PATP) to 4,4'-dimercaptoazobenzene (DMAB). The origin of the intense SERS signals of DMAB is carefully investigated based on the comparison of the SERS spectra of PATP obtained with both the THH Au NCs and the Au nanospheres with the exposed {111} facets. It is elucidated that the high-index {520} facet rather than the localized surface plasmons of the THH Au NCs plays a key role in producing a high yield of the product DMAB which is accompanied by the selective enhancement of the characteristic Raman signals.
机译：通过表面增强的拉曼散射（SERS）直接监测金属催化的反应始终是一个具有挑战性的问题，因为它需要具有等离子体性能的双官能金属结构，并且也充当催化剂。 在这里，我们证明了具有暴露{520}小平面的四偏向量（THH）金纳米纳米纳米（Au NCS）从界面处的分子提供高度增强的拉曼信号，允许原位观察来自对氨基噻吩醇（Patp）至4,4的化学转化 '-二维氧唑氮苯（DMAB）。 基于用THH AU NCS和AU纳米球与暴露的{111}小平面进行的PATP的SERS光谱的比较仔细研究DMAB的强烈SER信号的来源。 阐明了ThH Au NCS的高索引{520}面而不是局部表面等离子体在产生高产伴有特征拉曼信号的选择性增强的产品DMAB中发挥着关键作用。

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    Xiufeng Lang; Tingting You; Penggang Yin;

  • 作者单位

    Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing China.;

    Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing China.;

    Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing China.;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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