Preparation of MOF/Au composite nanoparticles and their SERS properties

Huihui Liu ,Baichuan Zhao ,Congyun Zhang

doi:10.24294/can.v5i1.1412

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Preparation of MOF/Au composite nanoparticles and their SERS properties

Huihui Liu

Baichuan Zhao

Congyun Zhang

Characterization and Application of Nanomaterials 2022, 5(1), 30-38; https://doi.org/10.24294/can.v5i1.1412

Submitted：13 Nov 2021

Accepted：13 Nov 2021

Published：08 Jan 2022

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Abstract

Surface-enhanced Raman scattering (SERS) spectrum has the characteristics of fast-detection, high-sensitivity and low-requirements for sample pretreatment. It plays a more and more important role in the detection of organic pollutants. In this study, MIL-101 and Au nanoparticles were prepared by hydrothermal method and aqueous solution reduction method respectively, and MIL-101/Au composite nanoparticles were prepared by electrostatic interaction. The SERS properties of the composite substrate were optimized by adjusting the size of Au nanoparticles and the surface distribution density of MIL-101 nanoparticles. The detection limit of Rhodamine 6G (R6G) for the composite substrate with the optimal ratio was investigated, which was as low as 10^–11 M. It is proved that MIL-101/Au composite nanoparticles have high sensitivity to probe molecules. When they are applied to the detection of persistent organic pollutants, the detection limit for fluoranthene can reach 10^–9 M and for 3,3’,4,4’-tetrachlorobiphenyl (PCB-77) can reach 10^–5 M.

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