Issue 110, 2015

High performance SERS active substrates fabricated by directly growing graphene on Ag nanoparticles

Abstract

An efficient surface enhanced Raman scattering (SERS) substrate of graphene-isolated Ag nanoparticle (G/AgNP) has been developed by using excimer laser to ablate the ordered pyrolytic graphite in high vacuum onto Ag nanoparticles. By combining the electromagnetic activity of AgNPs and unique physical/chemical properties of graphene, the G/AgNP substrates shows high performance in terms of sensitivity, signal-to-noise ratio and reproducibility. The average enhancement factor obtained from the G/AgNP substrates for rhodamine 6G probe molecules is over 108. The maximum deviations of SERS intensities from 20 positions of a same SERS substrate are in the range of 4.20% to 6.75% and from 20 different substrates in various batches are in the range of 4.43% to 7.71%, depending on different vibration modes. As a practical application of this SERS system, we detect the adenosine concentration in human serum. The detection results show a good linear correlation between SERS intensity and adenosine concentration within the range of 2 to 200 nM. This work may open up new opportunities in developing the applications of SERS in biomedical diagnostics, biological sensing and other biotechnology.

Graphical abstract: High performance SERS active substrates fabricated by directly growing graphene on Ag nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
08 set 2015
Accepted
16 out 2015
First published
16 out 2015

RSC Adv., 2015,5, 90457-90465

High performance SERS active substrates fabricated by directly growing graphene on Ag nanoparticles

S. Xu, J. Wang, Y. Zou, H. Liu, G. Wang, X. Zhang, S. Jiang, Z. Li, D. Cao and R. Tang, RSC Adv., 2015, 5, 90457 DOI: 10.1039/C5RA18333B

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