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LaI2@(18,3)SWNT: The Unprecedented Structure of a LaI2 “Crystal,” Encapsulated within a Single-Walled Carbon Nanotube

Published online by Cambridge University Press:  28 September 2005

Steffi Friedrichs ,
Angus I. Kirkland ,
Rüdiger R. Meyer ,
Jeremy Sloan  and
Malcolm L.H. Green
Steffi Friedrichs
Affiliation:
Nanoscience Centre, University of Cambridge, 11 J.J. Thomson Avenue, Cambridge CB3 0FF, United Kingdom
Angus I. Kirkland
Affiliation:
Department of Materials, Parks Road, Oxford OX1 3PH, United Kingdom
Rüdiger R. Meyer
Affiliation:
Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
Jeremy Sloan
Affiliation:
Department of Materials, Parks Road, Oxford OX1 3PH, United Kingdom Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
Malcolm L.H. Green
Affiliation:
Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
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Abstract

The novel crystallization properties of nano-materials represent a great challenge to researchers across all disciplines of materials science. Simple binary solids can be found to adopt unprecedented structures, when confined into nanometer-sized cavities, such as the inner cylindrical bore of single-walled carbon nanotubes (SWNT). Lanthanum iodide was encapsulated within SWNTs and the resulting encapsulation composite was analyzed using energy-dispersive X-ray microanalysis (EDX) and high-resolution transmission electron microscopy (HRTEM) imaging techniques, to reveal a one-dimensional crystal fragment, with the stoichiometry of LaI2, crystallizing in the structure of LaI3 with one third of the iodine positions unoccupied. A complete characterization of the encapsulation composite was achieved using an enhanced image restoration technique, which restores the object wave from a focal series of HRTEM images, providing information about the precise structural data of both filling material and host SWNT, and thereby enabling the identification of the SWNT chirality.

Keywords

single-walled carbon nanotubeslanthanum iodidefocal series HRTEM image restorationencapsulation compositesquantum wiresSWNT chirality
Type
Special Issue: Frontiers of Electron Microscopy in Materials Science
Information
Microscopy and Microanalysis , Volume 11 , Issue 5 , October 2005 , pp. 421 - 430
Copyright
© 2005 Microscopy Society of America

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