One-step synthesis of Pt-NiO nanoplate array/reduced graphene oxide nanocomposites for nonenzymatic glucose sensing

This work reports a one-step synthesis of reduced graphene oxide (rGO) supported platinum-nickel oxide nanoplate arrays (denoted as Pt-NiO/rGO) for nonenzymatic glucose sensing. The prepared Pt-NiO/rGO nanocomposite was characterized by scanning electron microscopy, X-ray energy dispersive spectrometry, and X-ray powder diffraction. The existence of a small quantity of Pt could significantly enhance the catalytic activity of NiO and played an important role in controlling the morphology of Pt-NiO nanoplate arrays. The vertical array structure of the Pt-NiO/rGO nanocomposite increased the effective loading of the Pt-NiO catalyst on the electrode surface to some extent. Therefore, the Pt-NiO/rGO modified glassy carbon electrode (GCE) was successfully used for highly sensitive and selective nonenzymatic glucose detection. The linear range was from 0.008 to 14.5 mM (R-2 = 0.9976, n = 41). The sensitivity was 832.95 mu A cm(-2) mM(-1) and the detection limit was 2.67 mu M (S/N = 3). The good catalytic activity and high sensitivity and stability make the Pt-NiO/rGO/GCE sensor a new kind of hybrid material for the electrochemical detection of glucose.