Quantification of Asymmetric Ion Transport in Glass Nanopipettes near Charged Substrates

被引:4
|
作者
Ma, Yingfei [1 ]
Liu, Rujia [1 ]
Shen, Xiaoyue [1 ]
Wang, Dengchao [1 ]
机构
[1] Univ Chinese Acad Sci, Sch Chem Sci, Beijing 10049, Peoples R China
基金
中国国家自然科学基金;
关键词
surface charge; scanning ion conductance microscopy; ion transport; nanopipettes; numerical simulation; SINGLE CONICAL NANOPORES; CURRENT RECTIFICATION; SURFACE-CHARGE; MICROSCOPY;
D O I
10.1002/celc.202101180
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Taking advantage of asymmetric ion transport in nanopipettes, the surface charges of various substrates have been successfully imaged by scanning ion conductance microscopy (SICM). The predominant electrostatic interaction between charged nanopipettes and substrates thus needs to be better elucidated and quantified, as traditional SICM theory is not adequate to describe the resulting ion current. Herein, we use both experimental and simulation methods to study the asymmetric ion-transport processes in nanopipettes near charged substrates, and correlate surface charge and geometry parameters to the resulting ionic current. It is found that for negatively charged substrates and nanopipettes, positive feedback responses are displayed at the high conductivity states, and they are sensitive to the applied voltages and surface charges. While at the low conductivity states, comparable negative feedback responses are largely independent of experimental conditions. The elucidated and quantified asymmetric ion transport features would allow more accurate measurements and analysis for approaching and surface charge mapping in SICM applications.
引用
收藏
页码:3917 / 3922
页数:6
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