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首页> 外文期刊>RSC Advances >Spiked gold nanotriangles: formation, characterization and applications in surface-enhanced Raman spectroscopy and plasmon-enhanced catalysis
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Spiked gold nanotriangles: formation, characterization and applications in surface-enhanced Raman spectroscopy and plasmon-enhanced catalysis

机译：Spiked Gold Nanizriangles：表面增强拉曼光谱和等离子体增强催化的形成，表征和应用

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We show the formation of metallic spikes on the surface of gold nanotriangles (AuNTs) by using the same reduction process which has been used for the synthesis of gold nanostars. We confirm that silver nitrate operates as a shape-directing agent in combination with ascorbic acid as the reducing agent and investigate the mechanism by dissecting the contribution of each component, i.e. , anionic surfactant dioctyl sodium sulfosuccinate (AOT), ascorbic acid (AA), and AgNO _(3) . Molecular dynamics (MD) simulations show that AA attaches to the AOT bilayer of nanotriangles, and covers the surface of gold clusters, which is of special relevance for the spike formation process at the AuNT surface. The surface modification goes hand in hand with a change of the optical properties. The increased thickness of the triangles and a sizeable fraction of silver atoms covering the spikes lead to a blue-shift of the intense near infrared absorption of the AuNTs. The sponge-like spiky surface increases both the surface enhanced Raman scattering (SERS) cross section of the particles and the photo-catalytic activity in comparison with the unmodified triangles, which is exemplified by the plasmon-driven dimerization of 4-nitrothiophenol (4-NTP) to 4,4′-dimercaptoazobenzene (DMAB).
机译：通过使用相同的还原过程，我们展示了金纳米锐利（阿姨）表面上的金属尖峰的形成，该方法已用于合成金纳米键。我们确认硝酸银作为形状引导剂与抗坏血酸作为还原剂组合使用，并通过对每个组分的贡献进行描述，研究机制，即阴离子表面活性剂二辛酸钠（AA），抗坏血酸（AA），和Agno _（3）。分子动力学（MD）模拟表明，AA附着在纳米前缘的AOT双层上，覆盖金簇的表面，这对于在阿姨表面上的尖峰形成过程具有特殊相关性。表面改性随着光学性质的变化而携手共进。覆盖尖峰的三角形厚度和大部分的银原子覆盖的厚度导致近红外吸收的强烈的蓝色偏移。与未改变的三角形相比，海绵状尖峰表面增加了颗粒的表面增强拉曼散射（SERS）横截面和光催化活性，这通过4-硝基苯酚的等离子体驱动的二聚化（4- NTP）至4,4'-二巯基氮苯并苯并（DMAB）。

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