• 文献标题:   Fabrication of sub-nanometer pores on graphene membrane for ion selective transport
  • 文献类型:   Article
  • 作  者:   QI H, LI ZW, TAO Y, ZHAO WW, LIN KB, NI ZH, JIN CH, ZHANG Y, BI KD, CHEN YF
  • 作者关键词:  
  • 出版物名称:   NANOSCALE
  • ISSN:   2040-3364 EI 2040-3372
  • 通讯作者地址:   Southeast Univ
  • 被引频次:   10
  • DOI:   10.1039/c8nr00050f
  • 出版年:   2018

▎ 摘  要

The ability to sieve ions through nanopores with high throughput has significant importance in seawater desalination and other separation applications. In this study, a plasma etching process has been demonstrated to be an efficient way to produce high-density nanopores on graphene membranes with tunable size in the sub-nanometer range. Besides the pore size, the nanopore density is also controllable through adjusting the exposure time of the sample to argon or oxygen plasma. The plasma-treated graphene membranes can selectively transport protons, Na+ and Cl- ions. Density function theory calculations uncover that the spa and vacancy-type defects construct different energy barriers for different ions, which allow the defected graphene membrane to selectively transport ions. Our study indicates that oxygen plasma etching can be used as a very convenient and efficient method for fabricating a monolayer filtration graphene membrane with tunable sub-nanometer pores.