DNA Brush-Directed Vertical Alignment of Extensive Gold Nanorod Arrays with Controlled Density

作者：Satoshi Nakamura, Hideyuki Mitomo, Miho Aizawa, Takeharu Tani, Yasutaka Matsuo, Kenichi Niikura, Andrew R. Pike, Masayuki Naya, Atsushi Shishido, Kuniharu Ijiro · 发表于：ACS Omega · 年份：2017 · DOI：10.1021/acsomega.7b00303 · 被引用次数：28 · 研究领域：Advanced biosensing and bioanalysis techniques、Gold and Silver Nanoparticles Synthesis and Applications、Biosensors and Analytical Detection

Control over the orientation of metal nanorods is important for both fundamental and applied research. We show that gold nanorods (GNRs) can be aligned in a single direction by adsorbing positively charged GNRs onto a double-strand DNA-grafted substrate through electrostatic interaction. The ordered structure can be optimized by controlling the density of the positive charges on the surface of the GNRs. We found, in agreement with the results of theoretical simulation, that the resultant structure exhibits plasmonic properties that are dependent on the GNR orientation relative to the direction of an oscillating electric field. Our approach provides new insights into the polymer-assisted self-assembly of rod-shaped nanoparticles utilizing electrostatic interactions.