Generation of Active Sites on Gold Nanostructured Surface through Ultrasound‐Assisted Direct Electrodeposition and Its Effect on Enzyme‐less Glucose Electro‐oxidation

By using ultrasound‐assisted direct electrodeposition, gold nanostructured films decorated by catalytic sites can be generated that are capable of effecting enzyme‐less oxidation of glucose at pH 7.4. The morphology, surface roughness and nature of the crystallographic orientation of the deposited gold nanoparticles on a glassy carbon electrode surface are studied by atomic force microscopy and metal underpotential deposition. The cyclic voltammetry signatures of the deposited nanostructured gold films reveal the identity of the catalytically active sites, which undergo pre‐monolayer oxidation/reduction on the nanostructured gold surface. These active species are responsible for the electrocatalytic oxidation of glucose under neutral pH conditions, enabling a steady‐state amperometric response in a linear range of concentration from 0.25 to 1.75 mM with a sensitivity of 0.849×10−3 mA cm−2 mM−1.