▎ 摘　　要

A facile two-step approach has been developed to fabricate blackberry-like gold nanostructure uniformly depositing on surface of reduced graphene oxide/three-dimensional nickel foam (Au-rGO/3DNF). The hybrid material has been successfully applied as a free-standing biosensor for nonenzymatically detecting H2O2 in 0.1 M PBS medium. The results indicated that the sensor could detect H2O2 a low detection limit of 1.06 mu M, wide linear detection range of 1-296 mu M, and high sensitivity of 51.28 mu A/(mu M cm(2)). In addition, the sensor showed excellent selectivity to H2O2 without poisonous influence from coexisting interferents, including ascorbic acid, dopamine, uric acid, urea, and KCl. Furthermore, the sensor also exhibited excellent repeatability, reproducibility and stability towards H2O2 detection. This may be due to the formation of a unique 3D nanoarchitecture, in which gold catalysts was effectively deposited on superconductive rGO to produce synergistic effect that efficiently improve electroactive sites, charge transfer ability, and mass diffusion. The achieved results may imply a highly potential method to develop a novel sensor with the enhanced performance for H2O2 sensing applications.