Surface-floating gold nanorod super-aggregates with macroscopic uniformity

扫码查看

原文链接

NETL
NSTL
万方数据
维普

外文摘要：We present a simple method for obtaining high-density two- and three-dimensional assemblies of gold nanorods (AuNRs) on polymer brush, referred to as "surface-floating super-aggregates", with uniform distribution spanning macroscopic distances. This was achieved via the single-step immersion of a poly(oligo ethylene glycol methacrylate) brush-containing substrate in a AuNR solution without any form of functionalization. Owing to extensive macroscale plasmonic coupling, we observed for the first time the gradual evolution of a unique sharp peak in addition to the transverse and longitudinal peaks, in this case, in the near-infrared (NIR) region. We also highlight the dynamic nature of these surface-floating super-aggregates, in which the AuNRs spread out when immersed in solution and collapse when dried to facilitate the access of probe molecules for biosensing applications. As a proof of concept, the surface-floating super-aggregates were used for surface-enhanced Raman spectroscopy, with which we detected rhodamine 6G at as low as sub-femtomolar concentrations. Owing to the excellent large-area uniform coverage and extreme simplicity of the fabrication method, such AuNR assemblies can easily be mass-produced and incorporated into cheap biosensors suitable for consumer use in the near future.

外文关键词：

nanoparticlepolymer brushnanocompositessurface-enhanced Raman spectroscopy (SERS)

作者：

Abdul R. Ferhan、Youju Huang、Anirban Dandapat、Dong-Hwan Kim

展开 >

作者单位：

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive 637457, Singapore

School of Chemical Engineering, Sungkyunkwan University, Gyeonggi-do 16419, Republic of Korea

基金：

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science an

项目编号：

NRF-2016R1A2B4007209

出版年：

2018

纳米研究(英文版)

CSTPCDCSCDEI

ISSN：

年,卷(期)：2018.11(5)

参考文献量54