Gold Nanoparticles/Carbon Nanotubes and Gold Nanoporous as Novel Electrochemical Platforms for L-Ascorbic Acid Detection: Comparative Performance and Application

Herein, the effects of nanostructured modifications a gold electrode surface in development electrochemical sensors for L-ascorbic acid detection have been investigated. In particular, bare has modified by electrodeposition single-walled carbon nanotubes (Au/SWCNTs) and formation highly nanoporous (h-nPG) film. The procedure realized sweeping potential between +0.8 V 0 vs. Ag/AgCl 25 scans suspension containing 5 mg/mL SWCNTs 10 mM HAuCl4 2.5 M NH4Cl solution Au/SWCNTs electrode. A similar was applied h-nPG NH4Cl, followed applying fixed −4 60 s. Cyclic voltammetry impedance spectroscopy were used to characterize properties electrodes. developed showed strong electrocatalytic activity towards ascorbic oxidation with enhanced sensitivities 1.7 × 10−2 μA μM−1cm−2 electrode, respectively, compared (1.0 μM−1cm−2). limits estimated be 3.1 1.8 μM, respectively. successfully determine human urine no significant interference satisfactory recovery levels.