Analytical Sciences

Direct Electrodeposition of Gold Nanoparticles onto Indium Tin Oxide Film Coated Glass: Application to the Detection of Arsenic(III)

Xuan DAI and Richard G. COMPTON

Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, United Kingdom

Gold nanoparticle modified indium tin oxide (ITO) film coated glass electrodes were prepared for the first time through direct electrochemical deposition from 0.5 M H₂SO₄ containing 0.1 mM HAuCl₄. The resulting electrode surfaces were characterized with AFM. Cyclic voltammetry and linear sweep voltammetry (LSV) of arsenic(III) on the modified electrodes were performed. After optimization, a LOD of 5 ± 0.2 ppb was obtained with 60 s deposition at -0.6 V (vs. SCE) in 1 M HNO₃ using LSV.

J-STAGE: View this article in J-STAGE