期刊
NATURE NANOTECHNOLOGY
卷 7, 期 11, 页码 728-732出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2012.162
关键词
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资金
- National Science Foundation (NSF) [0900832, 1054406]
- DARPA Center on Nanoscale Science and Technology for Integrated Micro/Nano-Electromechanical Transducers (iMINT)
- NSF Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology (MAST)
- National Nanotechnology Infrastructure Network (NNIN)
- NSF [ECS-0335765]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1054406, 0900832] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1034720, 1034710] Funding Source: National Science Foundation
Membranes act as selective barriers and play an important role in processes such as cellular compartmentalization and industrial-scale chemical and gas purification. The ideal membrane should be as thin as possible to maximize flux, mechanically robust to prevent fracture, and have well-defined pore sizes to increase selectivity. Graphene is an excellent starting point for developing size-selective membranes(1-8) because of its atomic thickness(9), high mechanical strength(10), relative inertness and impermeability to all standard gases(11-14). However, pores that can exclude larger molecules but allow smaller molecules to pass through would have to be introduced into the material. Here, we show that ultraviolet-induced oxidative etching(15,16) can create pores in micrometre-sized graphene membranes, and the resulting membranes can be used as molecular sieves. A pressurized blister test and mechanical resonance are used to measure the transport of a range of gases (H-2, CO2, Ar, N-2, CH4 and SF6) through the pores. The experimentally measured leak rate, separation factors and Raman spectrum agree well with models based on effusion through a small number of angstrom-sized pores.
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