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pubmed-article:18623293pubmed:dateCreated2008-8-7lld:pubmed
pubmed-article:18623293pubmed:abstractTextNanotubes are fabricated by atomic layer deposition (ALD) into nanopore arrays created by anodic aluminum oxide (AAO). A transmission electron microscopy (TEM) methodology is developed and applied to quantify the ALD conformality in the nanopores (thickness as a function of depth), and the results are compared to existing models for ALD conformality. ALD HfO2 nanotubes formed in AAO templates are released by dissolution of the Al2O3, transferred to a grid, and imaged by TEM. An algorithm is devised to automate the quantification of nanotube wall thickness as a function of position along the central axis of the nanotube, by using a cylindrical model for the nanotube. Diffusion-limited depletion occurs in the lower portion of the nanotubes and is characterized by a linear slope of decreasing thickness. Experimentally recorded slopes match well with two simple models of ALD within nanopores presented in the literature. The TEM analysis technique provides a method for the rapid analysis of such nanostructures in general, and is also a means to efficiently quantify ALD profiles in nanostructures for a variety of nanodevice applications.lld:pubmed
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pubmed-article:18623293pubmed:monthAuglld:pubmed
pubmed-article:18623293pubmed:issn1613-6829lld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:LeeSang BokSBlld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:SonSang JunSJlld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:RubloffGary...lld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:PerezIsraelIlld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:RobertsonErin...lld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:BanerjeeParag...lld:pubmed
pubmed-article:18623293pubmed:authorpubmed-author:Henn-Lecordie...lld:pubmed
pubmed-article:18623293pubmed:issnTypeElectroniclld:pubmed
pubmed-article:18623293pubmed:volume4lld:pubmed
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pubmed-article:18623293pubmed:pagination1223-32lld:pubmed
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pubmed-article:18623293pubmed:year2008lld:pubmed
pubmed-article:18623293pubmed:articleTitleTEM-based metrology for HfO2 layers and nanotubes formed in anodic aluminum oxide nanopore structures.lld:pubmed
pubmed-article:18623293pubmed:affiliationDepartment of Materials Science and Engineering and Institute for Systems Research, University of Maryland, 2145 A. V. Williams Building, College Park, MD 20742-3285, USA.lld:pubmed
pubmed-article:18623293pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18623293pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed