Nanoscale Vertical Arrays of Gold Nanorods by Self-Assembly: Physical Mechanism and Application

Nanoscale Research Letters

卷:14

Wei Gao¹  Jianxia Qi¹  Jun Dong¹  Yongkai Wang¹  Qingyan Han¹  Xing Zhao¹  Sandong Guo¹  Mengtao Sun² 

[1] School of Electronic Engineering, Xi’an University of Posts and Telecommunications;

[2] School of Mathematics and Physics, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, Center for Green Innovation, University of Science and Technology Beijing;

关键词: Gold nanorods;    Self-assembled method;    Surface-enhanced Raman scattering;    Surface plasmon resonance;   

DOI  :  10.1186/s11671-019-2946-6

来源: DOAJ

【 摘 要 】

Abstract The unique photonic effect of self-assembled metal nanoparticles is widely used in many applications. In this article, we prepared self-assembled gold nanorod (GNR) vertical arrays substrate by an evaporation method and found that the morphology of the substrate can be effectively regulated by changing the immersion time in the target molecules solution to obtain different Raman enhancement effects. We separately calculated the local electromagnetic field of the GNR vertical arrays and disorder substrate by the finite element method (FEM), which was consistent with the experimental results. Based on optimal soaking time, the sensitivity, reproducibility, and stability of substrates were separately studied. The experimental results show that the GNR vertical arrays can detect Rhodamine 6G (Rh6G) at concentrations as low as 10−11 M and exhibit good reproducibility and stability due to local electromagnetic (EM) field enhancement caused by the coupling of adjacent nanorods. Thus, our work can demonstrate that the substrate has excellent surface-enhanced Raman scattering (SERS) activity and the obtained GNR vertical arrays have great potential for biosensor and biodetection.

【 授权许可】

Unknown