New process for graphene membranes lattice engineering and uses thereof
AssigneeGaznat SA
InventorsKUMAR VAROON AGRAWAL, SHIQI HUANG, KUANG-JUNG HSU
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Abstract
The invention relates to a millisecond gasification method to fabricate graphene membranes, yielding a molecular sieving resolution of 0.2 Å for selective gas separation, and further relates to a method of preparation and uses thereof. In particular, the invention relates to the graphene membranes that have large CO2 permeances combined with attractive CO2/N2 and CO2/CH4 selectivity.
Claims18
1-17. (canceled)
A method for the preparation of a gas selective separation filter comprising the steps of:
- a) providing a graphene on a sacrificial support layer;
- b) subjecting said graphene membrane to one or more transient ozone gas pulses at a reactor temperature comprised between about 120 to 300° C.;
- c) purging ozone from the reactor chamber during or right after the transient pressurized ozone gas pulse;
- and
- d) cooling down the ozone treated graphene membrane to room temperature, wherein each transient ozone gas pulse lasts for about 0.01 to about 0.3 second.
A gas selective filter comprising a graphene membrane having a thickness of about 0.34 nm and a molecular sieving resolution of about 0.2 Å, where molecular sieving resolution refers to the ability of sieving molecules with size difference of 0.2 Å.
Dependencies are inferred from the claim text.