Abstract：
:Nanopore-based sensing has emerged as a promising candidate for affordable and powerful DNA sequencing technologies. Herein, we demonstrate that nanopores can be successfully fabricated in Mg alloys via focused electron beam (e-beam) technology. Employing in situ high-resolution transmission electron microscopy techniques, we obtained unambiguous evidence that layer-by-layer growth of atomic planes at the nanopore periphery occurs when the e-beam is spread out, leading to the shrinkage and eventual disappearance of nanopores. The proposed healing process was attributed to the e-beam-induced anisotropic diffusion of Mg atoms in the vicinity of nanopore edges. A plausible diffusion mechanism that describes the observed phenomena is discussed. Our results constitute the first experimental investigation of nanopores in Mg alloys. Direct evidence of the healing process has advanced our fundamental understanding of surface science, which is of great practical importance for many technological applications, including thin film deposition and surface nanopatterning.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zheng H,Liu Y,Cao F,Wu S,Jia S,Cao A,Zhao D,Wang Jdoi
10.1038/srep01920subject
Has Abstractpub_date
2013-01-01 00:00:00pages
1920issn
2045-2322pii
srep01920journal_volume
3pub_type
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