In this work, a polydopamine functionalized self-supported nanoporous gold film (PDA@NPGF) was prepared over a Au surface via anodization-chemical reduction method using dopamine as a reducing agent for the first time. Field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray analysis (EDX) were used to characterize the surface morphology and for elemental analysis. The electrocatalytic activity and sensing ability of the PDA@NPGF platform were examined towards hydrogen peroxide (H₂O₂) and dopamine (DA) detection using cyclic voltammetry and amperometry techniques. Cyclic voltammetry results confirm the excellent catalytic activity of the PDA@NPGF electrode for H₂O₂ and DA sensing compared to that of bare Au, and nanoporous gold film (NPGF) electrodes. The electrochemical determination of H₂O₂ and DA at PDA@NPGF was evaluated by amperometry by applying a constant potential of -0.13 V and 0.20 V (vs. Ag/AgCl) in the linear range of 1-100 µM, respectively. The detection limit of the developed sensor for H₂O₂ and DA analysis was calculated using the corresponding calibration plots and the values were found to be 0.1 µM and 0.27 µM (S/N = 3), respectively.

在这项工作中，首次使用多巴胺作为还原剂，通过阳极氧化-化学还原法在金表面上制备了聚多巴胺官能化的自支撑纳米多孔金膜（PDA @ NPGF）。场发射扫描电子显微镜（FE-SEM）和能量色散X射线分析（EDX）用于表征表面形态并进行元素分析。使用循环伏安法和安培法检测了PDA @ NPGF平台对过氧化氢（H ₂ O ₂）和多巴胺（DA）的电催化活性和传感能力。循环伏安法结果证实了PDA @ NPGF电极对H ₂ O ₂的优异催化活性。与裸金和纳米孔金膜（NPGF）电极相比，DA感测能力更高。通过电流法通过分别在1-100 µM的线性范围内施加-0.13 V和0.20 V（相对于Ag / AgCl）的恒定电势，通过电流分析法对PDA @ NPGF上H ₂ O ₂和DA的电化学测定进行评估。使用相应的校准图计算出用于H ₂ O ₂和DA分析的已开发传感器的检出限，发现该值分别为0.1 µM和0.27 µM（S / N = 3）。