Kim, Yoon-jeong Seo, Tae Hoon Kim, Yang Hui Suh, Eun-Kyung Bae, Sukang Hwang, Jun Yeon Kim, Jaewoo Kang, Youngjong Kim, Myung Jong Ahn, Seokhoon 2024-01-19T13:01:27Z 2024-01-19T13:01:27Z 2022-04-05 2022-01 1530-6984 https://pubs.kist.re.kr/handle/201004/115837 Self-assembled alkane layers are introduced between graphene layers to physically block nanometer size defects in graphene and lateral gas pathways between graphene layers. A well-defined hexatriacontane (HTC) monolayer on graphene could cover nanometer-size defects because of the flexible nature and strong intermolecular van der Waals interactions of alkane, despite the roughness of graphene. In addition, HTC multilayers between graphene layers greatly improve their adhesion. This indicates that HTC multilayers between graphene layers can effectively block the lateral pathway between graphene layers by filling open space with close-packed self-assembled alkanes. By these mechanisms, alternately stacked composites of graphene and self-assembled alkane layers greatly increase the gas-barrier property to a water vapor transmission rate (WVTR) as low as 1.2 x 10(-3) g/(m(2) day), whereas stacked graphene layers generally show a WVTR < 0.5 g/(m(2) day). Furthermore, the self-assembled alkane layers have superior crystallinity and wide bandgap, so they have little effect on the transmittance. English American Chemical Society Two-Dimensional Stacked Composites of Self-Assembled Alkane Layers and Graphene for Transparent Gas Barrier Films with Low Permeability Article 10.1021/acs.nanolett.1c03761 1 Nano Letters, v.22, no.1, pp.286 - 293 Nano Letters 22 1 286 293 N scie scopus 000740490200001 2-s2.0-85122674293 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article; Early Access PERMEATION WATER chemical vapor deposition graphene graphene gas barrier two-dimensional crystal engineering self-assembly scanning tunneling microscopy