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Using reduced graphene (RG) as a two-dimensional support, we have succeeded in synthesizing SnO2@Ag/RG nanocomposites.Without any reducing agent, stabilizer and linker, the photogenerated electrons from UV-irradiated SnO2 not only reduced silver ions into silver nanoparticles but also reduced graphene oxide into graphene.The negative charged silver ions and positive charged SnO2 formed SnO2@Ag core-shell composites supported by RG by Coulomb interaction.The graphene and silver nanometals were identified by UV-vis absorption spectra, IR absorption spectra and EDS analysis.XPS analysis and TEM indicated that SnO2@Ag core-shell composites anchored onto the graphene were prepared.Based on the new nanocomposites, a novel nonenzymatic electrochemical sensor was prepared to detect ractopamine.And the as-prepared nonenzyme glucose sensor exhibited excellent stability, repeatability, and selectivity.