Synthesis and Electrochemical Biosensing Properties of Hierarchically Porous Nitrogen-Doped Graphene Microspheres

Three-dimensional nitrogen-doped graphene microspheres (3D NGSs) were prepared by using integrated precursor-assisted chemical vapor deposition and the hydrothermal method. The 3D NGSs, with an interconnected network structure, show a high crystallization degree, abundant pore channels, and appropriate nitrogen doping. Electrochemical studies confirm that the glucose oxidase/NGSs electrode shows excellent catalytic activity with a high sensitivity of 15.89 mu A mM(-1) cm(-2), over a wide linear range of 0.1-3.7 mm, and fast response time of 3.6 s.