The invention relates to a millisecond gasification method to fabricate graphene membranes, yielding a molecular sieving resolution of 0.2 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 CO.sub.2 permeances combined with attractive CO.sub.2/N.sub.2 and CO.sub.2/CH.sub.4 selectivity.

The invention provides a gas-tight membrane for use as a burst membrane, especially for emergency venting in connection with batteries, e.g. for cars, e-bikes, handheld devices, electronic cigarettes, energy storing devices or heavy-duty tools. The membrane comprises a basic membrane having indentations obtained by an incomplete track-etch treatment applied to the basic membrane. Further, the invention provides a method for preparing the gas-tight membrane by an incomplete track-etch treatment applied to both sides of a basic membrane.

The present disclosure relates to a membrane having uniform pore size and pore arrangement. The present disclosure provides a membrane including a plurality of pores, wherein the diameter of the plurality of pores is 100 m or less, the porosity is 20 to 80%, the thickness is 3 to 500 m, and the membrane is a single layer membrane.