Fabrication of sub-nanometer pores on graphene membrane for ion selective transport†,Nanoscale

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Fabrication of sub-nanometer pores on graphene membrane for ion selective transport†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-20 00:00:00 , DOI: 10.1039/c8nr00050f
Han Qi _{1,

2,

3,

4,

5} , Zhongwu Li _{1,

2,

3,

4,

5} , Yi Tao _{1,

2,

3,

4,

5} , Weiwei Zhao _{1,

2,

3,

4,

5} , Kabin Lin _{1,

2,

3,

4,

5} , Zhenhua Ni _{3,

4,

5,

6} , Chuanhong Jin _{5,

7,

8,

9,

10} , Yan Zhang _{1,

2,

3,

4,

5} , Kedong Bi _{1,

2,

3,

4,

5} , Yunfei Chen _{1,

2,

3,

4,

5}

Affiliation

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 sp³ 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.

中文翻译：

在石墨烯膜上制备亚纳米孔以进行离子选择性迁移†

通过纳米孔以高通量筛分离子的能力在海水淡化和其他分离应用中非常重要。在这项研究中，等离子体刻蚀工艺已被证明是在石墨烯膜上产生亚纳米范围内可调尺寸的高密度纳米孔的有效方法。除了孔径之外，还可以通过调节样品对氩气或氧气等离子体的暴露时间来控制纳米孔的密度。等离子体处理过的石墨烯膜可以选择性地输送质子，钠⁺和Cl ^-离子。密度函数理论计算发现sp ³空位型缺陷为不同的离子构建了不同的能垒，使有缺陷的石墨烯膜能够选择性地传输离子。我们的研究表明，氧等离子体刻蚀可以作为一种非常方便，有效的方法来制造具有可调亚纳米孔的单层过滤石墨烯膜。

更新日期：2018-02-20

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