Modification of gold nanoparticles through allyl mercaptan bridge at boron-doped diamond electrode for an arsen (V) sensor

A simple, cheap and fast analytical procedure for arsen (V) detection was developed by applying the BDD (boron-doped diamond) modified by gold nanoparticles (AuNPs-BDD). The gold nanoparticles (AuNPs) with an average particle size of 10 nm was synthesized through reduction reaction of gold ions by NaBH4 in the presence of allyl mercaptan. These nanoparticles could be successfully deposited on the surface of boron-doped diamond (BDD) by an immersion process under the exposure of UV light (λ = 254 nm) for 6 h. An Au/C ratio of around 1:56 was observed at the prepared AuNPs-BDD. Preliminary study for arsen (V) detection by using anodic stripping voltammetry (ASV) technique using this electrode in a solution of 0.1 M HCl containing of NaBH₄ showed a good linearity (R² = 0.99) of the current flow in the concentration range of 0–100 µM with a limit detection of 0.105 µM.