Nguyen Van-Quynh, Ai Yong, Martin Pascal, Lacroix Jean-Christophe
Department of Advanced Materials Science and Nanotechnology, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
Université Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.
ACS Omega. 2017 May 10;2(5):1947-1955. doi: 10.1021/acsomega.7b00394. eCollection 2017 May 31.
Surface grafting from diazonium solutions triggered by localized surface plasmon has been investigated. An organic layer that is 20-30 nm thick is easily grafted onto gold nanoparticles (AuNPs) by visible-light illumination in a few minutes without any reducing agent or molecular photocatalyst. Grafting depends on the wavelength and polarization of the incident light. As a consequence, the orientation of the growth of the layer deposited on the AuNPs can be controlled by polarized light. Grafting is also highly enhanced between adjacent AuNPs or at the corners of triangular AuNPs, that is, in plasmonic hot spots. These results clearly demonstrate plasmon enhancement and strongly suggest that the transfer of hot electrons from the excited plasmonic NPs to the diazonium is the main mechanism. They also confirm that localized surface plasmon resonance can induce nanolocalized electrochemical reactions, thus contributing to the field of "plasmonic electrochemistry".
研究了由局域表面等离子体激元引发的重氮溶液表面接枝。在几分钟内，通过可见光照射，无需任何还原剂或分子光催化剂，就能轻松地将一层20 - 30纳米厚的有机层接枝到金纳米颗粒（AuNPs）上。接枝取决于入射光的波长和偏振。因此，沉积在AuNPs上的层的生长方向可以通过偏振光来控制。在相邻的AuNPs之间或三角形AuNPs的角上，即等离子体热点处，接枝也会显著增强。这些结果清楚地证明了等离子体增强作用，并强烈表明热电子从激发的等离子体纳米颗粒转移到重氮是主要机制。它们还证实了局域表面等离子体共振可以诱导纳米级局部电化学反应，从而为“等离子体电化学”领域做出贡献。
