Formulation Of SnO2/graphene Nanocomposite Modified Electrode For Synergitic Electrochemcial Detection Of Dopamine

Department of Nanoscience& Technology, Bharathiar University, Coimbatore 641 046, India

Adv. Mater. Lett., 2015, 6 (11), pp 973-977

DOI: 10.5185/amlett.2015.5924

Publication Date (Web): Oct 26, 2015

Copyright © IAAM-VBRI Press

E-mail: viswanathan@buc.edu.in

Abstract

Pristine SnO₂ and SnO₂/Graphene (SnO₂/GN) nanocomposites were prepared via facile hydrothermal method with amended electro catalytic activity towards Dopamine (DA) sensing. X-Ray Diffraction (XRD) pattern revealed the formation of tetragonal crystal system of SnO₂ that was retained in both pure metal oxide and composite. Fourier Transform – Infrared (FT-IR) transmission spectra evidenced the stretching and bending vibration modes of pure SnO₂ and SnO₂/GN nanocomposites. The in-plane bending modes of SnO₂ and graphatic peaks in graphene oxide (GO) and composite were identified in Raman spectral analysis. Morphology of synthesized materials and uniform distribution of SnO₂ on graphene sheet in SnO₂/GN composite were observed in Field Emission-Scanning Electron Microscope (FE-SEM). Electrochemical performance of SnO₂ and SnO₂/GN nanocomposite on modified Glassy Carbon (GC) electrode was evaluated for direct DA sensing using Cyclic Voltammetry (CV), Differential Pulse Voltammetry (DPV) and Chrono Amperometric techniques. The SnO₂/GN nanocomposite showed enhanced charge carrier mobility towards DA in presence of interferences like Ascorbic acid (AA) and Uric acid (UA) compared to pristine SnO₂. The limit of detection was calculated as (0.7μM) for (SnO₂/GN) which is better than bare SnO₂ (6.675 μM). These synergetic behaviors depicting SnO₂/GN composite can serve as a promising electrode in sensor transducers in near future.

Keywords

DA, nanocomposite, electrochemical sensor, direct electron transfer, amperometry.