title: Studies of ionic current rectification using polyethyleneimines coated glass nanopipettes.
abstract: The modification of glass nanopipettes with polyethyleneimines (PEIs) has been successfully achieved by a relatively simple method, and the smallest tip opening is around 3 nm. Thus, in a much wider range of glass pipettes with radii from several nanometers to a few micrometers, the ion current rectification (ICR) phenomenon has been observed. The influences of different KCl concentrations, pH values, and tip radii on the ICR are investigated in detail. The sizes of PEIs have been determined by dynamic light scattering, and the effect of the sizes of PEIs for the modification, especially for a few nanometer-pipettes in radii, is also discussed. These findings systemically confirm and complement the theoretical model and provide a platform for possible selectively molecular detection and mimic biological ion channels.
authors: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors: Shujuan
authors: S
authors: Liu
authors: Yitong
authors: Y
authors: Dong
authors: Wenbo
authors: W
authors: Zhao
authors: Xiang
authors: X
authors: Xie
authors: Tianrong
authors: T
authors: Ji
authors: Xiaohong
authors: X
authors: Yin
authors: Yun
authors: Y
authors: Liu
authors: Zhongwei
authors: Z
authors: Liang
authors: Dmitry
authors: D
authors: Momotenko
authors: Dehai
authors: D
authors: Liang
authors: Hubert H
authors: HH
authors: Girault
authors: Yuanhua
authors: Y
authors: Shao