Abstract Taking full advantage of the manganese (Mn) species which were produced in the fabrication of graphene oxide (GO) using modified Hummers method, loosely popcorn-shaped MnO2 microspheres were synthesized accordingly. A network composite of oxidized multi-walled carbon nanotubes (Ox-MWCNTs) and MnO2 (MnO2-Ox-MWCNTs) was assembled by a facile ultrasound-assisted approach. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) confirmed the successful preparation of MnO2 and the assembly of MnO2-Ox-MWCNTs. Based on drop-casting route, MnO2-Ox-MWCNTs composite modified glassy carbon electrode (GCE) (MnO2-Ox-MWCNTs/GCE) was constructed. The electrochemical performances of the proposed electrode were investigated by cyclic voltammetry (CV) and amperometric method. Due to the synergistic effect between loosely popcorn-shaped MnO2 microspheres and Ox-MWCNTs, the proposed electrode showed high peroxidase-like electrocatalysis activity for H2O2 detection. The peak currents linearly increased with H2O2 concentrations in the range 0.80-1000 μM, and limit of detection (LOD) was 0.38 μM. The proposed electrode could be employed for qualitative detection and quantitative determination of H2O2 in milk samples.

中文翻译：

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回收的爆米花状 MnO2 微球和 Ox-MWCNT 的混合复合材料作为灵敏的非酶促安培 H2O2 传感器

摘要 利用改良 Hummers 法制备氧化石墨烯 (GO) 过程中产生的锰 (Mn) 物种，相应地合成了松散的爆米花形 MnO2 微球。氧化多壁碳纳米管 (Ox-MWCNTs) 和 MnO2 (MnO2-Ox-MWCNTs) 的网络复合材料通过简便的超声辅助方法组装而成。X射线光电子能谱（XPS）、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）证实了MnO2的成功制备和MnO2-Ox的组装-MWCNTs。基于滴铸工艺，构建了MnO2-Ox-MWCNTs复合改性玻碳电极（GCE）（MnO2-Ox-MWCNTs/GCE）。通过循环伏安法（CV）和安培法研究了所提出电极的电化学性能。由于松散的爆米花状 MnO2 微球和 Ox-MWCNTs 之间的协同作用，所提出的电极对 H2O2 检测显示出高过氧化物酶样电催化活性。峰值电流随 H2O2 浓度在 0.80-1000 μM 范围内线性增加，检测限 (LOD) 为 0.38 μM。所提出的电极可用于牛奶样品中 H2O2 的定性检测和定量测定。峰值电流随 H2O2 浓度在 0.80-1000 μM 范围内线性增加，检测限 (LOD) 为 0.38 μM。所提出的电极可用于牛奶样品中 H2O2 的定性检测和定量测定。峰值电流随 H2O2 浓度在 0.80-1000 μM 范围内线性增加，检测限 (LOD) 为 0.38 μM。所提出的电极可用于牛奶样品中 H2O2 的定性检测和定量测定。