Results indicated that mono-dispersed AgNPs were obtained with particles size around 30 nm. Based on the etching of silver nanoparticles by hydrogen peroxide (H2O2), we have constructed a colorimetric sensor for H2O2 and glucose sensors basing on the use of AgNPs/GQDs hybrid as capture probe and signal probe. The fabricated sensors performed excellent sensitivity and selectivity, high reproducibility for H2O2 and glucose detection with a low detection limit of 100 nM and mM for hydrogen peroxide and glucose, respectively. | Vietnam Journal of Science and Technology 56 (1A) (2018) 146-151 GRAPHENE QUANTUM DOTS AS A REDUCING REAGENT AND STABILIZER FOR GREEN SYNTHESIS OF SILVER NANOPARTICLES: TOWARDS A HYDROGEN PEROXIDE AND GLUCOSE SENSOR Tran Vinh Hoang*, Nguyen Duc Nghia, Chu Duc Anh, Nguyen Van Tuan, Huynh Dang Chinh Department of Inorganic Chemistry, School of Chemical Engineering, Hanoi University of Science and Technology (HUST), 1st Dai Co Viet Road, Ha Noi * Email: Received: 15 August 2017; Accepted for publication: 21 March 2018 ABSTRACT In this work, we have developed a simple method for preparation of silver nanoparticles/graphene quantum dots hybrid (AgNPs/GQDs) using graphene quantum dots (GQDs) as reducing reagent and stabilizer. The synthesized GQDs and AgNPs/GQDs hybrid have been characterized by ultraviolet–visible spectroscopy (UV-Vis), photoluminescence (PL), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results indicated that mono-dispersed AgNPs were obtained with particles size around 30 nm. Based on the etching of silver nanoparticles by hydrogen peroxide (H2O2), we have constructed a colorimetric sensor for H2O2 and glucose sensors basing on the use of AgNPs/GQDs hybrid as capture probe and signal probe. The fabricated sensors performed excellent sensitivity and selectivity, high reproducibility for H2O2 and glucose detection with a low detection limit of 100 nM and mM for hydrogen peroxide and glucose, respectively. Keywords: graphene quantum dots, silver nanoparticles, green synthesis, glucose sensor, hydrogen peroxide detection. 1. INTRODUCTION Diabetes mellitus is one of the most common non-communicable diseases globally, and its related complications result in increasing disability, reduced life expectancy, and enormous health costs for virtually every society. Therefore, the efforts to develop various sensors for fast and reliable glucose monitoring for the diagnosis of diabetes have received continuous
