The Hybrid of Gold Nanoparticles and 3D Flower-like MnO2 Nanostructure with Enhanced Activity for Detection of Hydrogen Peroxide

3D Flower-like manganese dioxide (MnO2) nanostructure with the ability of catalysis for hydrogen peroxide (H2O2) and super large area that can support gold nanoparticles (AuNPs) with enhanced activity of electron transfer have been developed. The nanostructure of hybrids was prepared by directly mixing citric-capped AuNPs and 3-aminopropyltriethoxysilane (3-APTES)-capped nano-MnO2 using an electrostatic adsorption strategy. The Au-MnO2 composite was extensively characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), the Brunauer-Emmett-Teller (BET) method and X-ray photoemission spectroscopy (XPS). Electrochemical properties were evaluated through cyclic voltammetry (CV) and amperometric method. The prepared sensor showed excellent electrochemical properties towards H2O2 with a wide linear range from 2.5x10(-3)approximate to 1.39mM and 3.89 approximate to 13.89mM. The detection limit is 0.34M (S/N=3) with the sensitivities of 169.43AmM(-1)cm(-2) and 55.72AmM(-1)cm(-2). The detection of real samples was also studied. The result exhibited that the prepared sensor can be used for H2O2 detection in real samples.