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Generation of Active Sites on Gold Nanostructured Surface through Ultrasound‐Assisted Direct Electrodeposition and Its Effect on Enzyme‐less Glucose Electro‐oxidation
Author(s) -
Boopathi Sidhureddy,
Senthil Kumar Shanmugam,
Narasimha Phani Kanala Lakshmi
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402021
Subject(s) - amperometry , underpotential deposition , colloidal gold , cyclic voltammetry , materials science , monolayer , glassy carbon , electrochemistry , chemical engineering , inorganic chemistry , electrocatalyst , catalysis , electrode , nanoparticle , analytical chemistry (journal) , nanotechnology , chemistry , organic chemistry , engineering
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 m M with a sensitivity of 0.849×10 −3 mA cm −2 m M −1 .