Ultra-fast, Selective CO 2 Permeation by Free-standing Siloxane Nanomembranes

Fabrication and gas permselective behavior of free-standing polydimethylsiloxane (PDMS) nanomembranes are discussed. The largest CO2 permeance is close to 40,000 GPU (the highest one ever reported) at 34-nm membrane thickness without losing the CO2/N2 selectivity of 10–12, indicating the formation of pin-hole free nanomembranes. Fabrication and gas permeselective behavior of free-standing polydimethylsiloxane (PDMS) nanomembranes are discussed. The largest CO2 permeance is close to 40,000 GPU (the highest one ever reported) at 34-nm membrane thickness without losing the CO2/N2 selectivity of 10–12, indicating the formation of pin-hole free nanomembranes.