|Stabilization of graphene nanopore|
|J. Lee; Z. Q. Yang; W. Zhou; S. J. Pennycook; S. T. Pantelides; M. F. Chisholm
|Source Publication||Proceedings of the National Academy of Sciences of the United States of America
|Abstract||Graphene is an ultrathin, impervious membrane. The controlled introduction of nanoscale pores in graphene would lead to applications that involve water purification, chemical separation, and DNA sequencing. However, graphene nanopores are unstable against filling by carbon adatoms. Here, using aberration-corrected scanning transmission electron microscopy and density-functional calculations, we report that Si atoms stabilize graphene nanopores by bridging the dangling bonds around the perimeter of the hole. Si-passivated pores remain intact even under intense electron beam irradiation, and they were observed several months after the sample fabrication, demonstrating that these structures are intrinsically robust and stable against carbon filling. Theoretical calculations reveal the underlying mechanism for this stabilization effect: Si atoms bond strongly to the graphene edge, and their preference for tetrahedral coordination forces C adatoms to form dendrites sticking out of the graphene plane, instead of filling the nanopore. Our results provide a novel way to develop stable nanopores, which is a major step toward reliable graphene-based molecular translocation devices.|
; zhou, wu
; pantelides, sokrates t.
; chisholm, matthew f.] oak ridge natl lab, div mat sci & technol, oak ridge, tn 37831 usa. [lee, jaekwang
; pennycook, stephen j.
; pantelides, sokrates t.] vanderbilt univ, dept phys & astron, nashville, tn 37235 usa. [yang, zhiqing] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [pennycook, stephen j.
; chisholm, matthew f.] univ tennessee, dept mat sci & engn, knoxville, tn 37996 usa.
; lee, j (reprint author), oak ridge natl lab, div mat sci & technol, oak ridge, tn 37831 usa.
J. Lee,Z. Q. Yang,W. Zhou,et al. Stabilization of graphene nanopore[J]. Proceedings of the National Academy of Sciences of the United States of America,2014,111(21):7522-7526.
J. Lee,Z. Q. Yang,W. Zhou,S. J. Pennycook,S. T. Pantelides,&M. F. Chisholm.(2014).Stabilization of graphene nanopore.Proceedings of the National Academy of Sciences of the United States of America,111(21),7522-7526.
J. Lee,et al."Stabilization of graphene nanopore".Proceedings of the National Academy of Sciences of the United States of America 111.21(2014):7522-7526.
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