Abstract
We present a novel surface-enhanced Raman scattering (SERS) substrate based on graphene oxide/silver nanoparticles/copper film covered silicon pyramid arrays (GO/AgNPs/PCu@Si) by a low-cost and simple method. The GO/AgNPs/PCu@Si substrate presents high sensitivity, good homogeneity and well stability with R6G molecules as a probe. The detected concentration of Rhodamine 6 G (R6G) is as low as 10−15 M. These sensitive SERS behaviors are also confirmed in theory via a commercial COMSOL software, the electric field enhancement is not only formed between the AgNPs, but also formed between the AgNPs and Cu film. And the GO/AgNPs/PCu@Si substrates also present good property on practical application for the detection of methylene blue (MB) and crystal violet (CV). This work may offer a novel and practical method to facilitate the SERS applications in areas of medicine, food safety and biotechnology.
Highlights
We present a novel surface-enhanced Raman scattering (SERS) substrate based on graphene oxide/ silver nanoparticles/copper film covered silicon pyramid arrays (GO/Ag nanoparticles (AgNPs)/PCu@Si) by a low-cost and simple method
Very recently we found that the local electric field enhancement on the CuNPs/Cu foil is stronger than that on CuNPs/SiO2 substrate
In order to prove that the superiority of the pyramid Si (PSi) compared to flat Si, we model AgNPs/Si and AgNPs/PSi structure, respectively
Summary
In the latter case, the GO acts as the excellent adsorbent towards organic molecules, and leads to the R6G molecules uniformly distribute. (2) The PCu film can provide an extra electrical field enhancement due to the interaction with AgNPs. the excellent SERS behaviors of the Ag/PCu@Si substrate can contributed to the following points: (1) the pyramidal structure of the PSi substrate can be used as the amplifier for incident light and introduce large electrical field intensity of the plasmonic resonance. By detecting the MB and CV successfully, the result indicates that a great potential application of the GO/AgNPs/PCu@Si substrates to detect other analytes in real biological systems can be well achieved
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