Preparation And Electrochemical Sensing Performance Of Electrospun Mesoporous Silica-based Nanofiber

Electrospun mesoporous silica-based nanofiber has the advantages of high specific surface area,large pore volume,stable structure and easily achieving functional modification.And its self-standing membrane is in favor of material transportation and signal conduction with high efficiency and fabrication of functionalized device with good flexibility.In this paper,we systematically studied the preparation of mesoporous silica/polymer composite nanofiber and amino functionalized mesoporous silica/PVA composite nanofibers,fabrication of amino functionalized mesoporous composite nanofiber-modified electrode,loading the molecules with electrochemical activity on amino functionalized mesoporous composite nanofiber,and the electrochemical properties and electrochemical sensing of fabricated electrode.The main work includes the following:（1）The preparation of mesoporous silica/polymer composite nanofibers: the preparation of m-SiO₂ /PVP,m-SiO₂ / PVB,m-SiO₂ / PVA composite nanofibers are obtained respectively.the removal of template agent from those nanofibers has been studied.The results show that only the m-SiO₂ / PVA composite nanofibers can remove the template agent through extraction,and also maintain the superior mesoporous structure and fiber performance.（2）The preparation of amino functionalized mesoporous silica/PVA composite nanofibers: Amino successfully functionalized to the surface of mesoporous silica/PVA composite nanofibers is realized by using co-condensation way.The effects of CTAB additive amount,PVA additive amount,sol aging time on the morphology and mesoporous structure of the amino functionalized nanofiber are studied thoroughly.The results show that the CTAB and PVA addictive amount and sol aging time will affect the fiber morphology and mesoporous structure.The template agent can be completely removed after 24 h extraction.The amino functionalized mesoporous silica/PVA composite nanofibers based on optimal conditions have the fiber diameter of 200-650 nm,BET specific surface area of 656 m² / g,and the average pore size of 2.89 nm.（3）Loading the molecules with electrochemical activity on amino functionalized mesoporous composite nanofiber,and study of the electrochemical properties and electrochemical sensing of the fabricated electrode: Fabrication of amino functionalized mesoporous silica/PVA composite membrane nanofibers electrode,loading phosphomolybdic acid and cytochrome c respectively using those homemaded electrodes,and then the electrochemical and electrochemical sensing properties of electrodes with PMo are studied.The results show that the nanofiber membrane electrode can immobilize phosphomolybdic acid and maintain its electrochemical activity.PMo-electrode has linear current response for BrO3-with different concentration.The electrode can’t load cytochrome c.This paper systematically studied the preparation of amino functionalized mesoporous silica/PVA composite nanofiber.And this kind of fiber successfully immobilize electroactive molecules,and shows great potential in the fabrication of electrochemical sensing electrode.The work lay a foundation for the controllable preparation of mesoporous fiber and its application of electrochemical sensing field.