Flexible nano-cloth-like Ag cluster@rGO with ultrahigh SERS sensitivity for capture-optimization-detection due to effective molecule-substrate interactions.

Cui, Yanying; Xu, Linan; Li, Haitao; Wang, Xuan; Sun, Fuwei; Wang, Huan; Guo, Xinguang; Zhang, Yihe; Gao, Hongbo; An, Qi

Cui, Yanying; Xu, Linan; Li, Haitao; Wang, Xuan; Sun, Fuwei; Wang, Huan; Guo, Xinguang; Zhang, Yihe; Gao, Hongbo; An, Qi.

Afiliación

Cui Y; State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China. an@cugb.edu.cn.
Xu L; College of Materials Engineering, North China Institute of Aerospace Engineering, Langfang 065000, China.
Li H; School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China. htli@yzu.edu.cn.
Wang X; State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China. an@cugb.edu.cn.
Sun F; Chemistry department, Tsinghua University, 100084, P. R. China.
Wang H; School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China. htli@yzu.edu.cn.
Guo X; China National Institute of Food and Fermentation Industries Co, Ltd, Beijing 100015, China. 15011559852@139.com.
Zhang Y; State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China. an@cugb.edu.cn.
Gao H; China National Institute of Food and Fermentation Industries Co, Ltd, Beijing 100015, China. 15011559852@139.com.
An Q; State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China. an@cugb.edu.cn.

Nanoscale ; 14(34): 12313-12321, 2022 Sep 02.

Article en En | MEDLINE | ID: mdl-35968803

RESUMEN

Surface-enhanced Raman scattering (SERS) is a rapid and promising detection technique for trace molecules. A central goal of research in this area is to achieve the highly sensitive detection of molecules built on a systematic understanding of enhancement mechanisms. Herein, we develop a Ag cluster@rGO composite nanostructure, which utilizes strong molecular adsorption to achieve ultrahigh SERS sensitivity. Ag clusters are prepared without additional reducing agents, leaving a low carbon footprint in the fabrication process. Finite-difference time-domain (FDTD) simulations show strong electromagnetic field enhancements generated at the edges and interstices of Ag clusters due to the specificity of their structure. Density Functional Theory (DFT) calculations show that the HOMO-LUMO energy gap value is significantly reduced when Ag cluster@rGO forms a composite system with the target molecule, which enables efficient charge transfer between the substrate and molecules, resulting in charge transfer enhancement. A detection limit of 10-14 M using our substrate can be achieved for the environmental pollutant dye rhodamine 6G (Rh6G). The detection limits of bisphenol A (BPA) and its derivatives reach nanomolar levels with good signal stability. More importantly, we demonstrate the ability to rapidly screen BPA migration in Chinese Baijiu. Our SERS platform can be further developed for environmental pollution control and food safety.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Diagnostic_studies Idioma: En Revista: Nanoscale Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido

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