Gold nanoparticle superlattice monolayer with tunable interparticle gap for surface-enhanced Raman spectroscopy

Huayang Wang; Ling Yao; Xi Mao; Ke Wang; Lihua Zhu; Jintao Zhu

doi:10.1039/c9nr03590g

Gold nanoparticle superlattice monolayer with tunable interparticle gap for surface-enhanced Raman spectroscopy

Nanoscale. 2019 Aug 7;11(29):13917-13923. doi: 10.1039/c9nr03590g. Epub 2019 Jul 15.

Authors

Huayang Wang¹, Ling Yao¹, Xi Mao¹, Ke Wang¹, Lihua Zhu¹, Jintao Zhu¹

Affiliation

¹ Key Laboratory of Materials Chemistry for Energy Conversion and Storage (HUST) of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China. kewang@hust.edu.cn jtzhu@mail.hust.edu.cn.

PMID: 31304939
DOI: 10.1039/c9nr03590g

Abstract

Taking into account the near-field coupling interaction, non-close-packed two-dimensional nanoparticle (NP) assemblies with centimeter-scale and tunable interparticle gap (d) have attracted considerable attention due to their remarkable physicochemical properties, which show a wide range of potential applications, e.g., surface-enhanced Raman spectroscopy (SERS) active substrates. In the present work, we demonstrate that an Au NP superlattice monolayer (SM) with tunable d, playing a critical role in governing SERS activity, can be created via a rapid liquid-liquid interfacial assembly strategy. We show that the enhancement factor (EF) of SERS has an approximate 1/d^2.4 dependence on the gap of Au NP SM assemblies. This work provides a platform for the rational design of plasmon-enhanced spectroscopy active substrates for theoretical studies and for various applications, including SERS-active substrates, photoelectronic devices, biosensors and others.