Atom by Atom: HRTEM Insights into Inorganic Nanotubes and Fullerene-Like Structures: HRTEM insights into inorganic nanotubes and fullerene-like structures

Maya Bar-Sadan, Lothar Houben, Andrey N. Enyashin, Gotthard Seifert, Reshef Tenne

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

The characterization of nanostructures down to the atomic scale is essential to understand some physical properties. Such a characterization is possible today using direct imaging methods such as aberration-corrected high-resolution transmission electron microscopy (HRTEM), when iteratively backed by advanced modeling produced by theoretical structure calculations and image calculations. Aberration-corrected HRTEM is therefore extremely useful for investigating low-dimensional structures, such as inorganic fullerene-like particles and inorganic nanotubes. The atomic arrangement in these nanostructures can lead to new insights into the growth mechanism or physical properties, where imminent commercial applications are unfolding. This article will focus on two structures that are symmetric and reproducible. The first structure that will be dealt with is the smallest stable symmetric closed-cage structure in the inorganic system, a MoS2 nanooctahedron. It is investigated by means of aberration-corrected microscopy which allowed validating the suggested DFTB-MD model. It will be shown that structures diverging from the energetically most stable structures are present in the laser ablated soot and that the alignment of the different shells is parallel, unlike the bulk material where the alignment is antiparallel. These findings correspond well with the high-energy synthetic route and they provide more insight into the growth mechanism. The second structure studied is WS2 nanotubes, which have already been shown to have a unique structure with very desirable mechanical properties. The joint HRTEM study combined with modeling reveals new information regarding the chirality of the different shells and provides a better understanding of their growth mechanism.
Original languageEnglish GB
Pages (from-to)15643-15648
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume105
Issue number41
DOIs
StatePublished - 2008

Keywords

  • Berration-corrected high-resolution transmission electron microscopy
  • Inorganic closed-cage structures

ASJC Scopus subject areas

  • General

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