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Title: Continuously Tunable Pore Size for Gas Separation via a Bilayer Nanoporous Graphene Membrane

Journal Article · · ACS Applied Nano Materials
 [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of California, Riverside, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

We report that pore size is a crucial factor impacting gas separation, but difficult to control for a single-layer nanoporous graphene membrane. Here, we propose a bilayer design of a nanoporous graphene membrane with a continuously tunable effective pore size, by shifting the lateral position of one graphene layer against the other. Molecular dynamics simulations of gas permeation reveal that selective separation of gases, such as CO2, N2, and CH4, of 3–4 Å in kinetic diameter can be achieved for a bilayer membrane from single-layer pores as large as 25 Å in size. Hence, this bilayer design allows both great flexibility of pore sizes in a single layer of graphene and continuous variation of the effective pore size through the bilayer at a sub-ångstrom level.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1846555
Journal Information:
ACS Applied Nano Materials, Vol. 2, Issue 1; ISSN 2574-0970
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Dynamics and molecular interactions of single-stranded DNA in nucleic acid biosensors with varied surface properties journal January 2019
Entropic selectivity in air separation via a bilayer nanoporous graphene membrane journal January 2019

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