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Facile in situ synthesis of core-shell MOF@Ag nanoparticles composites on screen-printed electrodes for ultrasensitive SERS detection of polycyclic aromatic hydrocarbons

Abstract

This paper reports the fabrication of a highly sensitive and reusable substrate for surface-enhanced Raman scattering (SERS) analysis. Core-shell metal-organic framework (MOF; HKUST-1)@Ag nanoparticles (NPs) is prepared on a screen-printing electrode (SPE) via in-situ electrodeposition. The morphology and Ag coverage of core-shell structures can be easily controlled by electrodeposition potential and time without substrate motion. The HKUST-1 (Cu)@Ag composites combine abundant SERS “hot spots” among the high-density Ag NPs and the excellent adsorption performance of MOF, resulting in effective pre-concentration of analytes in close proximity to these “hot spots” and enhancement of SERS sensitivity. The optimized polyhedral HKUST-1@Ag structures exhibits high SERS activity for detecting 4-aminothiophenol at a concentration as low as 5×10-10 M. More importantly, the polyhedral HKUST-1@Ag composites provides high sensitivity for detection of polycyclic aromatic hydrocarbons (PAHs) while preserving the cyclability and selectivity required for reliable quantitative analysis. The method is effective over a wide range of PAHs concentrations (0.5 nM to 0.5 M), with detection limits as low as hundreds of pM. This study offers a new method to tailor the structure of MOF-based SERS substrates for on-site screening or point-of-care application.

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Supplementary files

Publication details

The article was received on 08 Apr 2019, accepted on 17 May 2019 and first published on 17 May 2019


Article type: Paper
DOI: 10.1039/C9TA03690C
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Facile in situ synthesis of core-shell MOF@Ag nanoparticles composites on screen-printed electrodes for ultrasensitive SERS detection of polycyclic aromatic hydrocarbons

    D. Li, X. Cao, Q. Zhang, X. Ren, L. Jiang, D. Li, W. Deng and H. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03690C

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