کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5009300 | 1462042 | 2017 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Research PaperReliable molecular trace-detection based on flexible SERS substrate of graphene/Ag-nanoflowers/PMMA Research PaperReliable molecular trace-detection based on flexible SERS substrate of graphene/Ag-nanoflowers/PMMA](/preview/png/5009300.png)
- First, the G/AgNFs/PMMA flexible substrate was fabricated by using a facilegraphene templated electroreduction method.
- Second, the detection limit for R6G in-situ detectionby covering the G/AgNFs/PMMA flexible substrate can reach 10â14Â M.
- Third, the G/AgNFs/PMMA flexible substrate can be used on real-world objects with any arbitrary morphology.
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 10â14M. 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 10â10M 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.
Journal: Sensors and Actuators B: Chemical - Volume 249, October 2017, Pages 439-450