Open-Nanogap-Induced Strong Electromagnetic Enhancement in Au/AgAu Monolayer as a Stable and Uniform SERS Substrate for Ultrasensitive Detection

Zhao, Yi-Xin1; Liang, Xi1; Chen, Yan-Li1; Chen, Yu-Ting1; Ma, Liang1; Ding, Si-Jing2; Chen, Xiang-Bai1; Wang, Qu-Quan3

2024-05-17

10.1021/acs.analchem.3c05797

ANALYTICAL CHEMISTRY   影响因子和分区

0003-2700

1520-6882

Nanogap-based plasmonic metal nanocrystals have been applied in surface-enhanced Raman scattering detection, while the closed and insufficient electromagnetic fields as well as the nonreproducible Raman signal of the substrate greatly restrict the actual application. Herein, a highly uniform Au/AgAu monolayer with abundant nanogaps and huge electromagnetic enhancement is prepared, which shows ultrasensitive and reproducible SERS detection. Au/AgAu with an inner nanogap is first prepared based on Au nanotriangles, and the nanogap is opened from the three tips via a subsequent etching process. The open-gap Au/AgAu displays much higher SERS efficiency than Au and Au/AgAu with an inner nanogap on detecting crystal violet due to the open-gap induced electromagnetic enhancement and improved molecular absorption. Furthermore, the open-gap Au/AgAu monolayer is prepared via interfacial self-assembly, which shows further improved SERS due to the dense and strong hotspots in the nanocavities induced by the electromagnetic coupling between adjacent open gaps. The monolayer possesses excellent signal stability, uniformity, and reproducibility. The analytic enhancement factor and relative standard deviation reach to 2.12 x 10(8) and 4.65% on detecting crystal violet, respectively. Moreover, the monolayer achieves efficient detection of thiram in apple juice, biphenyl-4-thiol, 4-mercaptobenzoic, melamine, and a mixed solution of four different molecules, showing great promise in practical detection.

SCI ; EI

英语

其他

National Natural Science Foundation of China["11904270","12274379"] ; National Natural Science Foundation of China[2022CFB246] ; Natural Science Foundation of Hubei Province["2023020201020329","2023010201020439"]

Chemistry

Chemistry, Analytical

WOS:001227295200001

AMER CHEMICAL SOC

CHEMISTRY

Web of Science

1.Wuhan Inst Technol, Hubei Key Lab Opt Informat & Pattern Recognit, Wuhan 430205, Peoples R China
2.China Univ Geosci Wuhan, Sch Math & Phys, Wuhan 430074, Peoples R China
3.Southern Univ Sci & Technol, Coll Sci, Dept Phys, Shenzhen 518055, Peoples R China

Zhao, Yi-Xin,Liang, Xi,Chen, Yan-Li,et al. Open-Nanogap-Induced Strong Electromagnetic Enhancement in Au/AgAu Monolayer as a Stable and Uniform SERS Substrate for Ultrasensitive Detection[J]. ANALYTICAL CHEMISTRY,2024,96(21).

Zhao, Yi-Xin.,Liang, Xi.,Chen, Yan-Li.,Chen, Yu-Ting.,Ma, Liang.,...&Wang, Qu-Quan.(2024).Open-Nanogap-Induced Strong Electromagnetic Enhancement in Au/AgAu Monolayer as a Stable and Uniform SERS Substrate for Ultrasensitive Detection.ANALYTICAL CHEMISTRY,96(21).

Zhao, Yi-Xin,et al."Open-Nanogap-Induced Strong Electromagnetic Enhancement in Au/AgAu Monolayer as a Stable and Uniform SERS Substrate for Ultrasensitive Detection".ANALYTICAL CHEMISTRY 96.21(2024).