Nitrogen-doped graphene-silver nanodendrites for the non-enzymatic detection of hydrogen peroxide

• Published in: Electrochimica acta Vol. 151; pp. 126 - 133
• Main Authors: Tajabadi, M.T., Basirun, W.J., Lorestani, F., Zakaria, R., Baradaran, S., Amin, Y.M., Mahmoudian, M.R., Rezayi, M., Sookhakian, M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2015
• Subjects: electrodeposition; Electrodes; Electron microscopy; electrophoretic deposition; Field emission; Graphene; Hydrogen peroxide; Indium tin oxide; N-graphene; Nanostructure; Reduction; Silver; Silver nanodendrite; Silver nanodendrite; electrophoretic deposition; Hydrogen peroxide; electrodeposition; N-graphene
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2014.11.031

•N-graphene/Ag nanodendrities by electrophoretic and electrochemical deposition.•Support of N-graphene shows efficient electrocatalytic activity toward H2O2 reduction.•The fabricated non-enzymatic H2O2 electrochemical sensor improved in the presence of Ag.
An organic-metal hybrid film based on nitrogen-doped graphene-silver nanodendrites (Ag-NG) was fabricated on an indium tin oxide (ITO) electrode using a simple electrophoretic and electrochemical sequential deposition approach. The microwave-assisted method was utilized for the synthesis of nitrogen-doped graphene. This method involves a three-step process consisting of graphite oxidation, exfoliation, and finally chemical reduction with the use of hydrazine as the reducing agent, which leads to the simultaneous reduction of graphene oxide and production of nitrogen-doped graphene. The morphology and structure of the as-fabricated electrode were determined by X-ray diffraction, field emission electron microscopy and transmission electron microscopy. The as-prepared Ag-NG-modified ITO electrode exhibited superior electrocatalytic activity toward hydrogen peroxide (H2O2) reduction, with a wide linear detection range of 100μM to 80mM (r=0.9989) and a detection limit of 0.26μM with a signal-to-noise ratio of 3. Furthermore, the fabricated non-enzymatic H2O2 electrochemical sensor exhibited excellent stability and reproducibility.