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

3D Flower-like manganese dioxide (MnO 2 ) nanostructure with the ability of catalysis for hydrogen peroxide (H 2 O 2 ) 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-MnO 2 using an electrostatic adsorption strategy. The Au-MnO 2 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 H 2 O 2 with a wide linear range from 2.5×10 −3 ∼1.39 mM and 3.89∼13.89 mM. The detection limit is 0.34 μM (S/N=3) with the sensitivities of 169.43 μA mM −1 cm −2 and 55.72 μA mM −1 cm −2 . The detection of real samples was also studied. The result exhibited that the prepared sensor can be used for H 2 O 2 detection in real samples.