TiO 2 nanoparticle-decorated graphene was produced by mechanical milling of TiO 2 powder with graphite followed by sonication of the nanocomposite in the presence of sodium lauryl sulfate surfactant. Sonication led to the exfoliation of graphite to produce TiO 2 nanoparticle–graphene composite. The as-prepared TiO 2 –graphite nanocomposite was characterized using X-ray diffraction and scanning electron microscopy and the exfoliated TiO 2 –graphene nanocomposite was analyzed using Raman spectroscopy, atomic force microscopy, and transmission electron microscopy. The results indicated the formation of faceted titanium dioxide particles with an average size of ~ 200 nm. Thickness of the few layered graphene sheets was found to be 2 + 0.8 nm. The glassy carbon electrode coated with the TiO 2 nanoparticle–graphene composite was used to detect potassium ferricyanide (K 3 FeCN 6 ) by cyclic voltammetric method. TiO 2 nanoparticle–graphene-coated surface demonstrated improved response with enhanced current for K 3 FeCN 6 detection.