Gold nanoparticles show electroactivity: Counting and sorting nanoparticles upon impact with electrodes
Dept. of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom; Mintek, 200 Malibongwe Drive, Randburg 2125, South Africa
Gold nanoparticles (AuNPs) in aqueous 0.10 M HCl are shown to be electroactive at oxidising potentials greater than 1.0 V (vs. Ag/AgCl) by means of voltammetric monitoring of AuNP-electrode collisions. The method promises the use of anodic particle coulometry for the detection and characterisation of the AuNPs.
chloride; gold nanoparticle; aqueous solution; article; coulometry; electrode; potentiometry