Synthesis and characterization of LaMnO3 nanocrystals and graphene oxide: fabrication of graphene oxide–LaMnO3 sensor for simultaneous electrochemical determination of hydroquinone and catechol

  • Sedighe Akbari Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman
  • Mohammad Mehdi Foroughi Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman
  • Hadi Hassani Nadiki Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman
  • Shohreh Jahani NanoBioElectrochemistry Research Center, Bam University of Medical Sciences, Bam, Iran
Keywords: Catechol, hydroquinone, graphene oxide, LaMnO3 nanoparticles, voltammetry


For the first time, a new method for preparation of graphene oxide-LaMnO3 (GO-LaMnO3) nanocompositeas a material of electrochemical sensor for simultaneous determination of catechol (CT) and hydroquinone (HQ) is developed. LaMnO3 nanoparticles have been characterized by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX) technique. Due to the excellent catalytic activity, enhanced electrical conductivity and high surface area, the simultaneous determination of HQ and CT with two well-defined peaks has been achieved at the GO-LaMnO3 modified electrode. Comparing with unmodified electrodes, the oxidation currents of HQ and CT increased remarkably. Also, the result exhibited a great decrease in anodic overpotentialresulting in about 150 mV negative shift of potential. The catalytic peak current values are found linearly dependent on the HQ and CT concentrations in the range of 0.5–433.3 and 0.5–460.0 μM with sensitivity of 0.0719 and 0.0712 μA μM-1, respectively. The detection limits for HQ and CT are determined as 0.06 and 0.05 μM, respectively.


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Electrochemical Science