A nonenzymatic electrochemical glucose sensor is described that was obtained by in situ photodeposition of high-density and uniformly distributed palladium nanoparticles (PdNPs) on a porous gallium nitride (PGaN) electrode. Cyclic voltammetric and chronoamperometric techniques were used to characterize the performance of the modified electrode toward glucose. In 0.1 M NaOH solution, it has two linear detection ranges, one from 1 μM to 1 mM, and another from 1 to 10 mM, and the detection limit is 1 μM. The electrode is repeatable, highly sensitive, fast and long-term stable. It was applied to the quantitation of serum glucose where it displayed accurate current responses. Graphical abstract A novel nonenzymatic electrochemical glucose sensor was developed by in situ photodeposition of palladium nanoparticles on the porous gallium nitride electrode.
Keywords: Electrochemical sensing; Gallium nitride; Glucose detection; Palladium nanoparticles; Photodeposition; Porous materials.