Rational design of Ag nanocubes-reduced graphene oxide nanocomposites for high-performance non-enzymatic H2O2 sensing

Ag nanocubes-reduced graphene oxide(AgNCs-rGO) nanocomposite was successfully prepared by an in situ synthesis method, in which AgNCs were loaded onto the surface of rGO during the formation of AgNCs in an ethylene glycol solution. Characterization by X-ray diffraction, UV-Vis spectroscopy, and scanning electron microscopy indicated the successful preparation of the AgNCs-rGO nanocomposite. Most importantly, the AgNCs-rGO nanocomposite exhibited excellent electrocatalytic activity for the reduction of H 2 O 2 , leading to a high-performance non-enzymatic H 2 O 2 sensor with a linear detection range and detection limit of approximately 0.1 mmol/L to 70 mmol/L( r =0.999) and 0.58 μmol/L, respectively. Our present work provides a new and highly efficient method for fabricating high-performance electrochemical sensors.