TY - JOUR
T1 - Ultrathin Carbon Molecular Sieve Films and Room-Temperature Oxygen Functionalization for Gas-Sieving
AU - Huang, Shiqi
AU - Villalobos, Luis francisco
AU - Babu, Deepu j.
AU - He, Guangwei
AU - Li, Mo
AU - Züttel, Andreas
AU - Agrawal, Kumar varoon
PY - 2019/5/8
Y1 - 2019/5/8
N2 - Inorganic membranes based on carbon molecular sieve (CMS) films hosting slit-like pores can yield high molecular selectivity with a sub-angstrom resolution in molecular differentiation and therefore are highly attractive for energy-efficient separations. However, the selective layer thickness of the state-of-the-art CMS membranes for gas separation is more than 1 μm, yielding low gas permeance. Also, there is no room-temperature functionalization route for the modification of the pore-size-distribution of CMS to increase the molecular selectivity. In this context, we report two novel fabrication routes, namely, transfer and masking techniques, leading to CMS films with thicknesses as small as 100 nm, yielding attractive gas-sieving performances with H2 permeance reaching up to 3060 gas permeation unit (GPU). Further, a rapid and highly tunable room-temperature ozone treatment-based postsynthetic modification is reported, shrinking the electron density gap in the nanopores by a fraction of an angstrom and improving gas selectivities by several folds. The optimized membranes yielded H2 permeance of 507 GPU and H2/CH4 selectivity of 50.7.
AB - Inorganic membranes based on carbon molecular sieve (CMS) films hosting slit-like pores can yield high molecular selectivity with a sub-angstrom resolution in molecular differentiation and therefore are highly attractive for energy-efficient separations. However, the selective layer thickness of the state-of-the-art CMS membranes for gas separation is more than 1 μm, yielding low gas permeance. Also, there is no room-temperature functionalization route for the modification of the pore-size-distribution of CMS to increase the molecular selectivity. In this context, we report two novel fabrication routes, namely, transfer and masking techniques, leading to CMS films with thicknesses as small as 100 nm, yielding attractive gas-sieving performances with H2 permeance reaching up to 3060 gas permeation unit (GPU). Further, a rapid and highly tunable room-temperature ozone treatment-based postsynthetic modification is reported, shrinking the electron density gap in the nanopores by a fraction of an angstrom and improving gas selectivities by several folds. The optimized membranes yielded H2 permeance of 507 GPU and H2/CH4 selectivity of 50.7.
U2 - 10.1021/acsami.9b03825
DO - 10.1021/acsami.9b03825
M3 - Article
SN - 1944-8244
VL - 11
SP - 16729
EP - 16736
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 18
ER -