Poly(amido amine) dendrimer and silver nanoparticle–multi-walled carbon nanotubes composite with poly(neutral red)-modified electrode for the determination of ascorbic acid

[摘要] A new film containing poly(amido amine) dendrimer, silver nanoparticles and multi-walled carbon nanotubes composite with poly(neutral red) was prepared on a paraffin wax impregnated graphite electrode. The PAMAM/AgNPs–MWCNT/PNR film exhibited promising electrocatalytic oxidation of ascorbic acid (AA) in acetate buffer solution of pH 4.0. The PAMAM/AgNPs–MWCNT/PNR film-modified electrode enhanced the sensitivity of detection of AA. The PAMAM/AgNPs–MWCNT/PNR film-modified electrode was characterized by cyclic voltammetry, chronoamperometry, hydrodynamic voltammetry (HDV) and difference pulse voltammetry. These experiments confirmed the electrocatalytic oxidation of AA by PAMAM/AgNPs–MWCNT/PNR film-modified electrode. The PAMAM/AgNPs–WCNT/PNRmodifiedelectrode has been found to possess good electrocatalytic activity towards AA oxidation which has been observed at a lower oxidation potential of around 0.26 V with a higher current response. The electrochemical oxidation of AA by PAMAM/AgNPs–MWCNT/PNR-modified electrode involved a two proton and two electron process. A linear relationshipbetween the catalytic current and AA concentration was obtained in the range from 0.16 to 2500 $\mu$M with a detection limitof 0.053 $\mu$M.

[学科分类] 材料工程

[关键词] Dendrimer;ascorbic acid;nanoparticles;electrocatalytic oxidation.