title: Subnanometer Two-Dimensional Graphene Oxide Channels for Ultrafast Gas Sieving.
abstract: 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 H2 permeability and 3-fold enhancement in H2/CO2 selectivity compared with commercial membranes. Formation mechanism of 2D channels is proposed on the basis of the driving forces, nanostructures, and transport behaviors.
authors: State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (former Nanjing University of Technology), 5 Xinmofan Road, Nanjing 210009, P.R. China.
authors: Jie
authors: J
authors: Shen
authors: State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (former Nanjing University of Technology), 5 Xinmofan Road, Nanjing 210009, P.R. China.
authors: Gongping
authors: G
authors: Liu
authors: State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (former Nanjing University of Technology), 5 Xinmofan Road, Nanjing 210009, P.R. China.
authors: Kang
authors: K
authors: Huang
authors: State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (former Nanjing University of Technology), 5 Xinmofan Road, Nanjing 210009, P.R. China.
authors: Zhenyu
authors: Z
authors: Chu
authors: State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (former Nanjing University of Technology), 5 Xinmofan Road, Nanjing 210009, P.R. China.
authors: Wanqin
authors: W
authors: Jin
authors: State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (former Nanjing University of Technology), 5 Xinmofan Road, Nanjing 210009, P.R. China.
authors: Nanping
authors: N
authors: Xu
keywords: external forces; gas separation; graphene oxide; membranes; molecular sieving; subnanometer channels; two-dimensional