Herein, we report a centrifugal force-driven end-to-end assembly of gold nanorods (Au NRs) via the H-bonded interaction of para-aminothiophenol (p-ATP) selectively bound to the longitudinal ends of the Au NRs. The plasmonic hot spots generated due to the Au NR assembly served as a catalytic center for carrying out the photochemical coupling reaction of p-ATP to dimercaptoazobenzene (DMAB). We also demonstrate the degradation of DMAB in the presence of hydrogen peroxide (H₂O₂) at the plasmonic hot spot. The coupling reaction was carried out at the hot spot of the assembled Au NRs upon surface plasmon excitation using a 632.8 nm laser. Surface-enhanced Raman scattering (SERS) kinetic data indicated that the plasmon-mediated coupling reaction was 1.6-fold faster at the plasmonic hot spot of the assembled Au NRs than that on the surface of the longitudinal end of the Au NRs. This, therefore, showed a new way of carrying out photocatalytic reactions at the plasmonic hot spot with a higher reaction rate.

中文翻译：

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端到端组装的金纳米棒热点上的等离子体增强化学反应

在这里，我们报告了金纳米棒（Au NRs）通过选择性结合到Au NRs的纵向末端的对-氨基硫酚（p -ATP）的H键相互作用的离心力驱动的端对端组装。由于Au NR组装而产生的等离子体激元热点充当催化中心，用于进行对-ATP与二巯基偶氮苯（DMAB）的光化学偶联反应。我们还证明了在过氧化氢（H ₂ O ₂）在等离子热点。使用632.8 nm激光在表面等离子体激元激发后，在组装的Au NRs的热点处进行偶联反应。表面增强拉曼散射（SERS）动力学数据表明，在组装好的Au NRs的等离激元热点处，等离激元介导的偶联反应比在Au NRs的纵向末端表面上快1.6倍。因此，这表明在等离子体激元热点上以更高的反应速率进行光催化反应的新方法。