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6CCVD Research

Self-assembly of gold nanoparticles onto boron-doped diamond electrode and its electrochemical properties

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2015-01-01
JournalJournal of Functional Biomaterials
AuthorsCui Ka
InstitutionsTsinghua University

Abstract

Section titled “Abstract”

Citrate-coated gold nanoparticles(diameter about 18nm)were absorbed onto boron-doped diamond(BDD)film electrode through a self-assembly process after the surface of the anodized BDD film was animated.By changing the pH of gold nanoparticles solution,we synthesized gold nanoparticles modified BDD electrode with uniform distribution and high coverage(about 30%)of gold nanoparticles.In the system of [Fe(CN)6]3-/4-,through AC impedance analysis and cyclic voltammetry analysis,we find that heterogeneous electron transfer rate constant(Kapp)of gold nanoparticles modified BDD electrode increased from 2.8×10-4 to8.9×10-4.After the BDD electrode was modified with gold nanoparticles,the oxidation potential of dopamine(DA)reduced from 0.54 to 0.3V,and the oxidation peak was improved,confirming that gold nanoparticles have catalytic effect on DA.

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