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

Abstract

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 3 10 À31.39 mM and 3.89~13.89 mM. The detection limit is 0.34 mM (S/N = 3) with the sensitivities of 169.43 mA mM À1 cm À2 and 55.72 mA mM À1 cm À2 . 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.

A biodegradable drug‐controlled delivery system based on mesoporous manganese dioxide and poly(dopamine)

“…The diffraction peaks located at 12.7°, 18.1°, 28.7°, 37.6°, and 49.9° on the XRD pattern of mMnO 2 are indexed to the (110), (200), (310), (211), and (411) crystal planes of α‐MnO 2 (JCPDS No. 44‐0141) 31 . In the case of mMnO 2 ‐MTX, the diffraction peaks of α‐MnO 2 can still be observed, implying that the loading of MTX does not alter the crystal structure of mMnO 2 ; on the other hand, the diffraction peaks of MTX disappear almost completely, suggesting that the MTX loaded in the mMnO 2 exists in the noncrystalline form 30 .…”

“…44-0141). 31 In the case of mMnO 2 -MTX, the diffraction peaks of α-MnO 2 can still be observed, implying that the loading of MTX does not alter the crystal structure of mMnO 2 ; on the other hand, the diffraction peaks of MTX disappear almost completely, suggesting that the MTX loaded in the mMnO 2 exists in the noncrystalline form. 30 Interestingly, there are no diffraction peaks corresponding to PDA on the XRD pattern of mMnO 2 -MTX-PDA, which might be ascribed to the amorphous structure of PDA obtained by in situ polymerization of DA.…”

Integration of Manganese Dioxide‐Based Nanomaterials for Biomedical Applications

“…The hydrothermal method is a common approach for the preparation of nanomaterials by controlling the reaction time, temperature, and pressure in a specific sealed vessel containing solvents to increase the solubility and reactivity. [ 60 ] For example, Wei et al [ 61 ] adopted an aqueous solution of KMnO 4 and manganese sulfate to achieve a spontaneous redox reaction at 140 °C, and obtained flower‐shaped MnO 2 nanomaterials by optimizing the reaction time. On this basis, Camargo et al [ 62 ] and Wang et al [ 63 ] have successfully prepared nanocomposite of MnO 2 and gold nanoparticles.…”

Carbonization and Preparation of Nitrogen-Doped Porous Carbon Materials from Zn-MOF and Its Applications

“…Additionally, hydrogen peroxide (H 2 O 2 ) is a toxic oxidizing agent, being used in various fields such as biomedical science, environmental science, food, textile and chemical industries [34][35][36]. Therefore, H 2 O 2 determination is of practical importance for both environmental and industrial purposes.…”

“…But, maintaining the pristine MOF morphology of the resulting porous materials from the carbonization process is a difficult task due to the shrinkage of framework/decomposing organic ligand during carbonization, therefore, a systematic study is necessary [33]. Additionally, hydrogen peroxide (H2O2) is a toxic oxidizing agent, being used in various fields such as biomedical science, environmental science, food, textile and chemical industries [34][35][36]. Therefore, H2O2 determination is of practical importance for both environmental and industrial purposes.…”