A molecularly impermeable polymer from two-dimensional polyaramids
Journal
Nature
Journal Volume
647
Journal Issue
8089
Start Page
383
End Page
389
ISSN
00280836
Date Issued
2025-11-13
Author(s)
Ritt, Cody L.
Quien, Michelle
Wei, Zitang
Gress, Hagen
Dronadula, Mohan T.
Altmisdort, Kaan
Nguyen, Huong Giang T.
Zangmeister, Christopher D.
Garimella, Sanjay S.
Amirabadi, Shahab
Gadaloff, Michael
Hu, Weiguo
Aluru, Narayana R.
Ekinci, Kamil L.
Bunch, J. Scott
Strano, Michael S.
Abstract
All polymers exhibit gas permeability through the free volume of entangled polymer chains1, 2–3. By contrast, two-dimensional (2D) materials including graphene stack densely and can exhibit molecular impermeability4, 5–6. Solution-synthesized 2D polymers that exhibit the latter by poly-condensation have been a longstanding goal. Herein, we demonstrate self-supporting, spin-coated 2D polyaramid nanofilms that exhibit nitrogen permeability below 3.1 × 10−9 Barrer, nearly four orders of magnitude lower than every class of existing polymer, and similar for other gases tested (helium, argon, oxygen, methane and sulfur hexafluoride). Optical interference during the pressurization of nanofilm-coated microwells allows measurement of mechanosensitive rim opening and sealing, creating gas-filled bulges that are stable exceeding three years. This discovery enables 2D polymer resonators with high resonance frequencies (about 8 MHz) and quality factors up to 537, similar to graphene. A 60-nm coating of air-sensitive perovskites reduces the lattice degradation rate 14-fold with an oxygen permeability of 3.3 × 10−8 Barrer. Molecularly impermeable polymers promise the next generation of barriers that are synthetically processable, chemically amenable and maximize molecular rejection with minimal material, ultimately advancing sustainability goals.
Publisher
Nature Research
Type
journal article