Department of Nanoscience& Technology, Bharathiar University, Coimbatore 641 046, India
Adv. Mater. Lett., 2015, 6 (11), pp 973-977
Publication Date (Web): Oct 26, 2015
Copyright © IAAM-VBRI Press
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.
DA, nanocomposite, electrochemical sensor, direct electron transfer, amperometry.