Preparation of Graphene Oxide and Its Application as Substrates for SERS

Xiaodong Li

doi:10.1155/2018/8050524

Abstract

Graphene oxide (GO) was synthesized by a modified Hummer’s method and was then reduced by the hydrothermal process. Both GO and reduced GO (rGO) were employed as surface-enhanced Raman scattering (SERS) substrates to detect rhodamine 6G (R6G). After adsorbed on the surface of GO, the fluorescence background of R6G was highly quenched, and its Raman scatterings were enhanced. When adsorbed on the surface of rGO, the fluorescence background was further quenched at the price of lower SERS intensity. The results displayed that oxygen groups on the surface of GO had positive effect on the SERS effect of GO. The amount of oxygen groups on the surface of GO should be one key parameter to adjust the SERS activity of GO.

Highlights

Surface-enhanced Raman spectroscopy (SERS) has attracted much attention since its discovery in the 1970s [1]
Using rhodamine 6G (R6G) as a probe molecule, we studied the SERS activities of Graphene oxide (GO) before and after the reduction process to study the effect of number of oxygen-containing groups on the SERS activities of GO
In the X-ray diffraction (XRD) spectrum of graphite, a strong characteristic diffraction peak appears near 26.5° to 2θ, which is attributed to high-purity graphite, corresponding to the (002) plane with the spacing d 0.34 nm. is characteristic peak indicates that the untreated graphite powder has a regular spatial arrangement

Summary

Introduction

Surface-enhanced Raman spectroscopy (SERS) has attracted much attention since its discovery in the 1970s [1]. Erefore, under the conventional SERS detection conditions, graphene does not support the EM and can only enhance the Raman signal of the probe molecule through CM. In this way, graphene can be an ideal SERS substrate to investigate the CM for SERS [11]. Using rhodamine 6G (R6G) as a probe molecule, we studied the SERS activities of GO before and after the reduction process to study the effect of number of oxygen-containing groups on the SERS activities of GO

Experimental

Experimental Process

Results and Discussion

Conclusions