Document Detail


Selective molecular sieving through porous graphene.
MedLine Citation:
PMID:  23042491     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 because of its atomic thickness, high mechanical strength, relative inertness and impermeability to all standard gases. 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 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), CO(2), Ar, N(2), CH(4) and SF(6)) 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 ångstrom-sized pores.
Authors:
Steven P Koenig; Luda Wang; John Pellegrino; J Scott Bunch
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-07
Journal Detail:
Title:  Nature nanotechnology     Volume:  -     ISSN:  1748-3395     ISO Abbreviation:  Nat Nanotechnol     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101283273     Medline TA:  Nat Nanotechnol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA.
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