Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 903, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115843
Keywords
Electrochemical sensor; Mesoporous silica nanospheres; ZIF-8; Au nanoparticles; Molecularly imprinted polymer; Atropine
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Funding
- National Natural Science Foundation of China [22176162]
- Open Fund of Guangxi Key Laboratory of Automatic Detecting Technology and Instruments [YQ20201]
- Project of Culinary Science Key Laboratory of Sichuan Province [PRKX2020Z01]
- Key Scientific Research Projects in University of Henan Province [22A550015]
- Project of Hubei Key Laboratory of Nutritional Quality and Safety of Agro Products [2020NQSAP-03]
- Nanhu Scholars Program for Young Scholars of XYNU
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The study introduces a novel flower-like core-shell mesoporous silica nanospheres@zeolitic imidazolate framework-8 (MSN@ZIF-8) hybrid electrocatalyst with hierarchical framework, enhanced porosity, tunable functionality, and excellent stability. A molecularly imprinted electrochemical sensor based on MSN@ZIF-8 nanocomposites was developed with wide linear range, subnanomolar detection limit, and specific selectivity for atropine monitoring. Further research on porous electrocatalysts with improved stability and performance for various sensor applications is highly anticipated.
Porous materials are of great interest for sensor design, while poor conductivity and single structure hinder their electrochemical application seriously, and the development of an effective way to improve their specificity for targets is another challenge. Herein, novel flower-like core-shell mesoporous silica nanospheres@zeolitic imidazolate framework-8 (MSN@ZIF-8) hybrid electrocatalyst with hierarchical framework, enhanced porosity, tunable functionality, and excellent stability was firstly attempted. Significantly, the electronic environment and dynamics were greatly enhanced in MSN@ZIF-8, owing to the abundant faradic active sites of MSN inner cores and plentiful pores for electrolyte permeation and analytes adsorption of ZIF-8 outer shell. Thereafter, the molecularly imprinted electrochemical sensor based on MSN@ZIF-8 nanocomposites was prepared with p-aminothiophenol as functional monomer, Au nanoparticles as cross-linker, and atropine as template molecule via electropolymerization technique, which had a wide linear range, subnanomolar detection limit, and specific selectivity for atropine monitoring. Our work will inspire further studies on developing porous electrocatalysts with improved stability and performance, which is highly expected for varieties of sensor applications.
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