Nb2C MXene self-assembled Au nanoparticles simultaneously based on electromagnetic enhancement and charge transfer for surface enhanced Raman scattering

Ziheng Yang; Li Jiang; Weidan Zhao; Boya Shi; Xiangwen Qu; Yekai Zheng; Pengwei Zhou

doi:10.1016/j.saa.2023.122843

Nb₂C MXene self-assembled Au nanoparticles simultaneously based on electromagnetic enhancement and charge transfer for surface enhanced Raman scattering

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Oct 15:299:122843. doi: 10.1016/j.saa.2023.122843. Epub 2023 May 11.

Authors

Ziheng Yang¹, Li Jiang², Weidan Zhao¹, Boya Shi¹, Xiangwen Qu¹, Yekai Zheng¹, Pengwei Zhou¹

Affiliations

¹ School of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China.
² School of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China. Electronic address: lijiang@cjlu.edu.cn.

PMID: 37207571
DOI: 10.1016/j.saa.2023.122843

Abstract

Recent years, two-dimensional transition metal carbonitrides (MXene) have attracted much attention in the field of surface-enhanced Raman scattering (SERS). However, the relatively low enhancement of MXene is a major challenge. Herein, Nb₂C-Au NPs nanocomposites were prepared by electrostatic self-assembly method, which have a synergistically conjugated SERS effect. The EM hot spots of Nb₂C-Au NPs are significantly enlarged and expanded, while the surface Fermi level is decreased. This synergistic effect could improve the SERS performance of the system. Consequently, for the dye molecules CV and MeB, the detection limits reach 10^-10 M and 10^-9 M, respectively, while for biomolecule adenine, the detection limit is as low as 5 × 10^-8 M. The results also show the good concentration-dependent linearity, uniformity, reproducibility and stability of SERS substrate. Nb₂C-Au NPs could be a fast, sensitive and stable SERS platform for label-free and non-destructive detection. This work may expand the application of MXene based materials in the field of SERS.

Keywords: MXene; Nanocomposite; Nb(2)C-Au NPs; Quantitative detection; SERS.