CO
The present disclosure relates to a novel composite film configured for CO 2 sensing, and the method of making and using the novel composite film. The novel composite film comprises a carbon nanotube film and a CO 2 absorbing layer deposited on the carbon nanotube film, wherein the CO 2 absorbing layer comprises a mixture of a branched polyethylenimine, a polyethylene glycol, and poly[1-(4-vinylbenzyl)-3-methylimidazolium tetrafluoroborate] of formula I: wherein n ranges from 10-300.
1. A composite film configured for CO 2 sensing, wherein the composite film comprises a carbon nanotube film and a CO 2 absorbing layer deposited on the carbon nanotube film, wherein the CO 2 absorbing layer comprises a mixture of a branched polyethylenimine, a polyethylene glycol, and poly[1-(4-vinylbenzyl)-3-methylimidazolium tetrafluoroborate] of formula I:
wherein n ranges from 10-300.
2. The composite film of claim 1 , wherein the thickness of said carbon nanotube film is 10-500 nm, the thickness of said CO 2 absorbing layer is 100-1000 nm.
3. The composite film of claim 1 , wherein said carbon nanotube film comprises chlorosulfonic acid.
4. The composite film of claim 1 , wherein said branched polyethylenimine has a molar molecular weight of 10 kg/mol, wherein said polyethylene glycol has a molar molecular weight of 0.5 kg/mol to 50 kg/mol.
5. The composite film of claim 1 , wherein said branched polyethylenimine has a weight percentage of 40-60% of the total weight of the CO 2 absorbing layer.
6. The composite film of claim 1 , wherein said polyethylene glycol has a weight percentage of 40-60% of the total weight of the CO 2 absorbing layer.
7. The composite film of claim 1 , wherein said poly[1-(4-vinylbenzyl)-3-methylimidazolium tetrafluoroborate] has a weight percentage of 1-5% of the total weight of the CO 2 absorbing layer.