X射线光电子能谱
检出限
生物传感器
化学
电子转移
密度泛函理论
限制
分析化学(期刊)
材料科学
光化学
化学工程
色谱法
计算化学
生物化学
工程类
机械工程
作者
Shengyun Huang,Mingxia He,Jiang Shao-juan,Gehong Su,Zhiwei Lü,Tao Liu,Chun Wu,Xianxiang Wang,Yanying Wang,Xiaoqing Zhao,Chang Song,Hanbing Rao,Mengmeng Sun
标识
DOI:10.1016/j.snb.2023.134009
摘要
Herein, based on the excellent redox ability of the transition metal oxide Mn3O4, the key strategy of introducing WO3 was used to effectively modulate the electronic structure of the Mn active species and improve the catalyst nanozyme activity. The characterizations of transition electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) presented that the dropping of WO3 accelerated the electron transfer and redistribution capacity of WO3/Mn3O4, thus exhibiting excellent oxidase and peroxidase activities. Density functional theory (DFT) revealed that WO3/Mn3O4 effectively increased the adsorption capacity of O2 molecules and drastically reduced the kinetic energy potential of the reaction-limiting step in the oxidase-like activity. An “on-off-on” colorimetric and intelligent biosensing platform for epinephrine and Ag+ was successfully constructed. It was used to visualize and monitor epinephrine levels in human serum with a linear range of 0.075–65 µM and a detection limit of 0.055 µM. The mechanism of detection was revealed using infrared spectroscopy. Moreover, WO3/Mn3O4 took more readily to obtain the electrons of epinephrine than 3,3′,5,5′-tetramethylbenzidine. Therefore, the colorimetric sensor of epinephrine on the basis of the oxidase of WO3/Mn3O4 had a promising future in the biomedical field.
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