气候变化领域集成服务门户(CCPortal): Bottom-up synthesis of graphene films hosting atom-thick molecular-sieving apertures

CCPortal

DOI	10.1073/pnas.2022201118
	Bottom-up synthesis of graphene films hosting atom-thick molecular-sieving apertures
	Villalobos L.F.; Goethem C.V.; Hsu K.-H.; Li S.; Moradi M.; Zhao K.; Dakhchoune M.; Huang S.; Shen Y.; Oveisi E.; Boureau V.; Agrawal K.V.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:37
英文摘要	Incorporation of a high density of molecular-sieving nanopores in the graphene lattice by the bottom-up synthesis is highly attractive for high-performance membranes. Herein, we achieve this by a controlled synthesis of nanocrystalline graphene where incomplete growth of a few nanometer-sized, misoriented grains generates molecular-sized pores in the lattice. The density of pores is comparable to that obtained by the state-of-the-art postsynthetic etching (1012cm-2) and is up to two orders of magnitude higher than that of molecular-sieving intrinsic vacancy defects in singlelayer graphene (SLG) prepared by chemical vapor deposition. The porous nanocrystalline graphene (PNG) films are synthesized by precipitation of C dissolved in the Ni matrix where the C concentration is regulated by controlled pyrolysis of precursors (polymers and/or sugar). The PNG film is made of few-layered graphene except near the grain edge where the grains taper down to a single layer and eventually terminate into vacancy defects at a node where three or more grains meet. This unique nanostructure is highly attractive for the membranes because the layered domains improve the mechanical robustness of the film while the atom-thick molecular-sized apertures allow the realization of large gas transport. The combination of gas permeance and gas pair selectivity is comparable to that from the nanoporous SLG membranes prepared by state-of-the-art postsynthetic lattice etching. Overall, the method reported here improves the scale-up potential of graphene membranes by cutting down the processing steps. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Graphene membrane; Intrinsic vacancy defects; Low-temperature growth; Nanocrystalline graphene; Nanopores
语种	英语
scopus关键词	carbon; graphene; nanocrystal; nanomaterial; nanoporous material; nickel; polymer; sugar; Article; chemical vapor deposition; comparative study; concentration (parameter); gas permeability; gas transport; molecular size; pore density; precipitation; pyrolysis; synthesis
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238390
作者单位	Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne, Sion, 1950, Switzerland; Interdisciplinary Centre for Electron Microscopy, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
推荐引用方式 GB/T 7714	Villalobos L.F.,Goethem C.V.,Hsu K.-H.,et al. Bottom-up synthesis of graphene films hosting atom-thick molecular-sieving apertures[J],2021,118(37).
APA	Villalobos L.F..,Goethem C.V..,Hsu K.-H..,Li S..,Moradi M..,...&Agrawal K.V..(2021).Bottom-up synthesis of graphene films hosting atom-thick molecular-sieving apertures.Proceedings of the National Academy of Sciences of the United States of America,118(37).
MLA	Villalobos L.F.,et al."Bottom-up synthesis of graphene films hosting atom-thick molecular-sieving apertures".Proceedings of the National Academy of Sciences of the United States of America 118.37(2021).