Fluorescence determination based on graphene oxide

Graphene oxide (GO) has been prepared and the structure of the prepared GO was characterized by Transmission Electron Microscopy (TEM). And then we demonstrated that GO could quench the fluorescence of Rhodamine 6G (Rh6G) in aqueous solution. According to the UV-vis absorption spectrum of GO and the fluorescence spectrum of Rh6G, we found that GO quenched the fluorescence of Rh6G because of two factors. Firstly, the electrons moved from the Rh6G to the surface GO; secondly, Rh6G adsorbed onto the GO surface. However, trace Th4+ enhanced the fluorescent signal of Rh6G, which was quenched by GO prior to metal ions addition. (C) 2012 Elsevier B.V. All rights reserved.