Abstract
A three-dimensional surface enhanced Raman scattering (SERS) substrate based on graphene nanofoam (GNF)/AgNPs hybrid nanostructure has been prepared using a typical liquid phase reduction synthetic method. The synthesized materials which utilized the three-dimensional framework structure of NF with micropore diameter 50–500 μm were illustrated by scanning electron microscope (SEM) images. Meanwhile, the NF was coated with graphene oxide (GO) evidenced by energy dispersive spectra (EDS) images. In addition, the composite was modified with Ag nanoparticles (AgNPs) whose average size was about 500 nm. The preparation process is very economic and environmental-friendly. The SERS experiment of hybrid nanostructure substrate using Rhodamine 6 G (R6G) as probe molecules showed that the concentration of GO aqueous solution and the Ag NPs growth time were two key factors to determine the intensity of SERS signal and the limit of detection of the hybrid nanostructure is as low as 1 × 10−8 M. 30 different test areas were selected to evaluated the homogeneous SERS platforms, and the RSD is only 8.2%, indicating highly uniformed and reproducibility. In summary, the three-dimensional (3D) substrates by a simple method showed a good sensitivity, stability and reproducibility, and it is promising for application in the field of rapid trace molecule detection in the realistic environment.
Published Version
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