Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 249, Issue -, Pages 439-450Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.04.118
Keywords
Flexible SERS substrate; Ag-nanoflowers; Molecular detection
Funding
- Natural Science Foundation of China (NSFC) [51572216, 61604122, 11674199]
- NSFC Major Research Program on Nanomanufacturing [91323303]
- industrial science and technology research project in Shanxi province [2015GY005]
- 111 Program [B14040]
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Flexible substrate consisted of PMMA-supported monolayer graphene with sandwiched Ag-nanoflowers (G/AgNFs/PMMA) for ultrasensitive, reproducible, and stable surface-enhanced Raman scattering (SERS) detection is reported. Graphene templated micro-current-assisted chemical reduction method was employed to support AgNFs growth, and uniform-distribution AgNFs with all directions nanotips can generate tremendous enhancement factor and intensive hotspots. The minimum detectable concentration (i.e., detection limit) for rhodamine 6G (R6G) in-situ detection by covering this as-synthesized G/AgNFs/PMMA flexible substrate can be as low as 10-14M. Moreover, graphene can effectively stabilize the SERS signals and protect AgNFs from oxidation, endowing this flexible substrate a long-term stability with maximum intensity deviation lower than 10%, for the quantitative measurements from spot-to-spot or substrate-to-substrate. In order to trial its practical applications with various real-world surfaces, the in-situ SERS detection of phenylalanine@apple, adenosine aqueous solution and methylene-blue@fish was performed by covering this G/AgNFs/PMMA flexible substrate. Clear Raman peaks can be obtained for all the selected samples with concentration of 10-(10) M and, importantly, good linear relationship between Raman intensity and molecular concentration indicates the potential application of the G/AgNFs/PMMA flexible substrate in quantitative determination. Thus, this high-efficiency and low-cost flexible SERS substrate may provide a new way for the molecular trace-detection in food security and environmental protection. (C) 2017 Published by Elsevier B.V.
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