Facile synthesized SnO2 decorated functionalized graphene modified electrode for sensitive determination of daidzein

Publication date: 1 June 2017
Source:Talanta, Volume 168
Author(s): Yamin Fu, Lu Wang, Yinghao Duan, Lina Zou, Baoxian Ye
A one-step and facile method using SnCl2·H2O as reducing agent to reduce graphene oxide (GO) was performed in the aid of poly(diallyldimethylammonium chloride) solution (PDDA). SnCl2·H2O is not only a reducing agent for graphene oxide (GO), but also a precursor of SnO2. SnO2-PDDA-GR composite was characterized by various surface, structural and electrochemical analysis techniques, such as transmission electron microscopy (TEM), UV spectrum (UV–vis), Infrared Spectrum (IR), X-ray diffraction (XRD), Cyclic voltammograms (CV) and electrochemical impedance (EIS). The SnO2-PDDA-GR composite was used to constructed electrochemical sensor (SnO2-PDDA-GR/GCE) for the determination of daidzein. Under the optimized experimental condition, it was found that the response of peak current is linear to the concentration of daidzein in the ranges of 2.0×10⁻⁸ −1.0×10⁻⁶molL⁻¹, and the detection limit was estimated to be 6.7×10⁻⁹mol L⁻¹ (S/N=3). Furthermore, this sensor was successfully applied for the determination of daidzein in traditional Chinese medicine (pueraria lobata) and Daidzein tablets.

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