title: Non-enzymatic oxalic acid sensor using platinum nanoparticles modified on graphene nanosheets.
abstract: An enzyme-free oxalic acid (OA) electrochemical sensor was assembled using a platinum nanoparticle-loaded graphene nanosheets (PtNPGNs)-modified electrode. The PtNPGNs, with a high yield of PtNPs dispersed on the graphene nanosheets, were successfully achieved by a green, rapid, one-step and template-free method. The resulting PtNPGNs were characterized by transmission electron microscopy (TEM), high-resolution TEM, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and an X-ray diffraction technique. Electrochemical oxidation of OA on the PtNPGNs-modified electrode was investigated by cyclic voltammetry and differential pulse voltammetry methods. Based on the results, the modified electrode exhibited high electrochemical activity with well-defined peaks of OA oxidation and a notably decreased overpotential compared to the bare or even the GNs-modified electrode. Under optimized conditions, a good linear response was observed for the concentration of OA and its current response was in the range of 0.1-15 mM and 15-50 mM with a detection limit (S/N = 3) of 10 μM. Furthermore, the electrochemical sensor presented good characteristics in terms of stability and reproducibility, promising the applicability of the sensor in practical analysis.
authors: College of Biological Engineering, Jimei University, Xiamen 361021, China. xmchen@jmu.edu.cn
authors: Xiaomei
authors: X
authors: Chen
authors: Zhixiong
authors: Z
authors: Cai
authors: Zhiyong
authors: Z
authors: Huang
authors: Munetaka
authors: M
authors: Oyama
authors: Yaqi
authors: Y
authors: Jiang
authors: Xi
authors: X
authors: Chen
mesh_terms: D006108:Graphite / Q000737:chemistry*; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D019815:Oxalic Acid / Q000032:analysis* / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D010984:Platinum; D006108:Graphite; D019815:Oxalic Acid