An Electrochemical Sensor Based on Au/rGO/GaN Porous Layer for Dopamine Determination

Abstract

Dopamine (DA) is a biomarker that plays an important regulatory role in human body. In this paper, a Au/rGO/PGaN electrochemical sensor was fabricated by electrodeposition of reduced graphene oxide (rGO)and gold nanoparticles on GaN porous layer（PGaN）, which was grown by metal organic chemical vapor deposition (MOCVD). The composition and structure of the Au/rGO/PGaN electrode was characterized by scanning electron microscopy (SEM)．The sensing performance of the Au/rGO/PGaN electrode on DA was investigated using cyclic voltammetry and chronoamperometry. The sensor can detect dopamine in the range of 0.5-400μmol/L, and the detection limit of DA is 0.15μmol/L. In addition, the Au/rGO/PGaN electrode has good stability and repeatability, high sensitivity and wide detection range.