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| Electrochemical Detection of Hydrogen Peroxide Using a Glass Carbon Electrode Modified with Gold Nanoparticles-Graphene Quantum Dots Composite Loaded on Multi walled Carbon Nanotubes |
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| DOI： |
| KeyWord:graphene quantum dots gold nanoparticles multi walled carbon nanotubes hydrogen peroxide electrocatalysis |
| Author | Institution |
| YU Hao*,GAO Xiao-ling,XU Na,CHEN Xiao-xia,FENG Xiao,JIN Jun |
1.延安大学化学与化工学院;2.陕西省化学反应工程重点实验室 |
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| Abstract: |
| A glass carbon electrode was modified with gold nanoparticles(AuNPs),graphene quantum dots(GQDs) and multi walled carbon nanotubes(MWCNTs) composite by dropping method.Firstly,GQDs were prepared using hydrogen peroxide as etching agent,then the gold nanoparticles-graphene quantum dots composite(AuNPs-GQDs) was prepared by in situ chemical reduction method and loaded on MWCNTs with poly dimethyl diallyl ammonium chloride(PDDA) as a crosslinking agent.The characterization of this composite was investigated by fluorescence spectrometry(MFS),UV-Vis absorption spectroscopy(UV-Vis spectra) and transmission electron microscopy(TEM).A glass carbon electrode modified wtih the composite(AuNPs-GQDs-PDDA-MWCNTs/GCE) was obtained with the dropping method.The electrochemical behavior of hydrogen peroxide on this modified electrode was investigated in detail.The results showed that this modified electrode had a high electrocatalytic activity for the oxidation of hydrogen peroxide under the synergic action of AuNPs,GQDs and MWCNTs.Under the optimum conditions,the linear range for the determination of hydrogen peroxide by amperometry was in the range of 2.0×10-8 – 1.5×10-3 mol/L,with a detection limit(3sb) of 8.0×10-9 mol/L and a sensitivity of 61.6 μA/(mmol?L-1). |
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