Dendrimer-encapsulated Pt nanoparticles on mesoporous silica for glucose detection |
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| Authors: | Xiao Han Yihua Zhu Xiaoling Yang Jianmei Zhang Chunzhong Li |
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| Institution: | 1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China
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| Abstract: | A hybrid system of mesoporous silica (MS) particle incorporated with poly(amidoamine) dendrimer-encapsulated platinum nanoparticles (Pt-DENs) was constructed in a neutral aqueous solution through electrostatic interaction. The MS/Pt-DENs composite particles immobilized with glucose oxidase (GOx) were used to modify a glassy carbon electrode for detecting the electrocatalytic response to the reduction of glucose. Pt-DENs can improve the conductivity of MS and enhance the electron transfer between redox centers in enzymes and electrode surfaces. The structure of composite particles and the performance of MS/Pt-DEN-modified electrodes were characterized by transmission electron microscopy, N2 sorption characterization method, electrochemical impedance spectroscopy, cyclic voltammetry and amperometric measurements. The MS/Pt-DENs/GOx-modified electrodes, which had a fast response of GOx less than 3?s, could be used for the determination of glucose ranging from 0.02 to 10?mM. The detection limits were 4???M at signal-to-noise ratio of 3. |
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