期刊
ACS NANO
卷 10, 期 3, 页码 3398-3409出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b07304
关键词
subnanometer channels; external forces; graphene oxide; two-dimensional; membranes; molecular sieving gas separation
类别
资金
- National Natural Science Foundation of China [21490585, 21476107, 21406107]
- Ministry of Education of China [IRT13070]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Innovation Project of Graduate Research by Jiangsu Province [ICYLX_0764]
Two-dimensional (2D) materials with atomic thickness and extraordinary physicochemical properties exhibit unique mass transport behaviors, enabling them as emerging nanobuilding blocks for separation membranes. Engineering 2D materials into membrane with subnanometer apertures for precise molecular sieving remains a great challenge. Here, we report rational-designing external forces to precisely manipulate nanoarchitecture of graphene oxide (GO)-assembled 2D channels with interlayer height of 0.4 nm for fast transporting and selective sieving gases. The external forces are synergistic to direct the GO nanosheets stacking so as to realize delicate size-tailoring of in-plane slit-like pores and plane-to-plane interlayer-galleries. The 2D channels endow GO membrane with excellent molecular-sieving characteristics that offer 2-3 orders of magnitude higher H-2 permeability and 3-fold enhancement in H-2/CO2 selectivity compared with commercial membranes. Formation mechanism of 2D channels is proposed on the basis of the driving forces, nanostructures, and transport behaviors.
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