OICC Press Journal of Nanostructure in Chemistry 2193-8865 6 2 (June 2016) 2016 02 19 Synthesis, characterization and electrochemical-sensor applications of zinc oxide/graphene oxide nanocomposite 10.1007/s40097-016-0188-z EN Ehab Salih Center for Materials Science, Zewail City of Science and Technology, 6th October City, Giza, 12588, EG Moataz Mekawy Center for Materials Science, Zewail City of Science and Technology, 6th October City, Giza, 12588, EG Rabeay Y. A. Hassan Microanalysis Lab, Applied Organic Chemistry Department, National Research Centre (NRC), Cairo, 12622, EG Ibrahim M. El-Sherbiny Center for Materials Science, Zewail City of Science and Technology, 6th October City, Giza, 12588, EG Journal Article 2016 02 19 Abstract Nanostructured metal oxides received considerable research attention due to their unique properties that can be used for designing advanced nanodevices. Thus, in the present study, zinc oxide/graphene oxide (ZnO/GO) nanocomposite was synthesized, characterized and implemented in an electrochemical system. The formation of a compacted ZnO/GO nanocomposite was confirmed by field emission scanning electron microscopy, high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and attenuated total reflectance spectroscopy. HRTEM showed that ZnO nanocrystals (NCs) are well formed on the GO surface and are interconnected via GO functional groups. From the XRD patterns, the average size of ZnO NCs was found to be about 21.7 ± 2.3 nm which is in agreement with the HRTEM results. The newly developed nanocomposite-based electrochemical system showed a significant improvement in both electrical conductivity and the electrocatalytic activity as noted from the cyclic voltammetry measurements. Consequently, direct electron transfer efficiency was confirmed and used for the amperometric detection of hydrogen peroxide (H 2 O 2 ). Fast and sensitive electrochemical responses for the detection of H 2 O 2 at 1.1 V in the linear response range from 1 to 15 mM with the detection limit (S/N = 3) of 0.8 mM were obtained. These results demonstrated that the prepared ZnO/GO/CPE displayed a good performance along with high sensitivity and long-term stability.