Journal
RSC ADVANCES
Volume 4, Issue 16, Pages 7944-7951Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra45596c
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Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi
- Major Research Project [02(0060)/12/EMR-II]
- Human Resources Development program of the Korea Institute of Technology Evaluation and Planning (KETEP) [20134030200330]
- Korea government Ministry of Trade, Industry and Energy
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A simple, environmental benign, time and cost-efficient green approach has been proposed for the reduction of graphene oxide (GO) and the synthesis of reduced GO (rGO)/mono and bimetallic composites using Azadirachta indica extract. The high crystallinity and face-centred-cubic structure of monometallic silver (Ag) and bimetallic silver-gold (Ag-Au) nanoparticles anchored over rGO were determined from the X-ray diffraction patterns. The functional groups involved in the reduction of GO and metallic precursors were identified by the Fourier transform-infrared spectroscopic technique. The obtained morphological images revealed a homogeneous distribution of spherical shaped Ag/Ag-Au nanoparticles with a narrow size distribution anchored over the rGO sheets. The prepared nanostructures exhibited significant electrocatalytic activities towards the reduction of hydrogen peroxide (H2O2), leading to a non-enzymatic electrochemical sensor with a prompt amperometric response. The non-enzymatic sensor responded linearly (R-2 = 0.9970) to the concentration of H2O2 over a range of 0.1 to 5 mM with a low level detection limit of 1 mu M.
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