Core-shell structure DA-CDs/AuNPs for the recognition of fenamidone by surface-enhanced Raman scattering

Kexiang Li; Hong Li; Qian Zhang; Dezhi Yang; Yaling Yang

doi:10.1016/j.saa.2024.123865

Core-shell structure DA-CDs/AuNPs for the recognition of fenamidone by surface-enhanced Raman scattering

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Apr 5:310:123865. doi: 10.1016/j.saa.2024.123865. Epub 2024 Jan 6.

Authors

Kexiang Li¹, Hong Li², Qian Zhang³, Dezhi Yang¹, Yaling Yang⁴

Affiliations

¹ Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China.
² Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China; Yunnan Agricultural University, Yunnan Province 650100, China.
³ Yunnan Lunyang Technology Co., Ltd, Yunnan Province 650032, China.
⁴ Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China. Electronic address: yilyil8@163.com.

PMID: 38219613
DOI: 10.1016/j.saa.2024.123865

Abstract

In this work, a facile synthesis method for dopamine carbon dots-based Au nanoparticles (DA-CDs/AuNPs) by seed gold method was reported as the surface enhanced Raman scattering (SERS) booster. DA-CDs with rich in surface functional groups was synthesized using dopamine, citric acid and ethylenediamine as precursors by a facile hydrothermal method, and can be used as the capping agents and reducing agents for the synthesis of DA-CDs/AuNPs. Due to the electromagnetic "hot spots" effect, DA-CDs/AuNPs with core-shell structure exhibited strong SERS activity. Based on the specific interaction of DA-CDs/AuNPs and fenamidone, a detection method of fenamidone was established with a low detection limit of 0.05 μg/mL. Finally, the SERS sensor was successfully applied to the detection of fenamidone in fruit with recoveries between 90.6 % and 98.7 %. The method here proposed can be reliably applied for fenamidone detection on fruits.

Keywords: Dopamine carbon dots; Fenamidone; Fruits; Gold nanoparticles; Surface-enhanced Raman scattering.