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Direct Observation Of Iodine Atomic Chains In I-Doped Carbon Nanotubes

Published online by Cambridge University Press:  02 July 2020

X. Fan ,
E.C. Dickey ,
S.J. Pennycook ,
L. Grigorian ,
P.C. Eklund ,
R. BuczkoM  and
S. T. Pantelides
X. Fan
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN37831 Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY40506
E.C. Dickey
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY40506
S.J. Pennycook
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN37831 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN37235
L. Grigorian
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY40506
P.C. Eklund
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY40506
R. BuczkoM*
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN37831 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN37235
S. T. Pantelides
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN37831 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN37235
*
*On leave from: Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland. This research was sponsored by the Division of Materials Sciences, U.S. Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp., by NSF under grant no. DMR-98-03768, in part by the MRSEC Program of the NSF under award no. DMR-9809686, and by an appointment to the ORNL postdoctoral research program administered jointly by ORNL and ORISE.
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Single wall carbon nanotubes (SWNT) were doped with iodine, resulting in charge transfer between the iodine and carbon [1]. It was found that the iodine intercalation is air stable and also reversible by simple heat treatment. This behavior is in contrast to graphite and fullerenes which do not form charge transfer compounds with iodine. Although the iodine-induced charge transfer was not found in any other carbon polymorph solid, it has been found in some low dimensional organic polymers such as polyaniline,[2] forming charged linear-chain polyiodides (I3)- and (I5)-. This suggests that the geometric configuration of the carbon may play a very important role in iodine intercalation. In this study, we use Z-contrast imaging[3] in a VG Microscopes HB603U STEM to directly observe the configuration of iodine within the nanotube bundles. First-principles density-functional calculations are then used to explain the preference for the observed iodine configuration within the nanotubes.

Type
Atomic Structure And Microchemistry Of Interfaces
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 144 - 145
Copyright
Copyright © Microscopy Society of America

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References

1.Grigorian, L. et al., Phys. Rev. Lett., 80, No.25, 5560 (1998)CrossRefGoogle Scholar
2.Zeng, Xing-Rong and Ko, Tse-Man, J. Polym. Sci. B 35, 1993,(1997)3.0.CO;2-O>CrossRefGoogle Scholar
3.Pennycook, S. J., “STEM: Z-contrast”, in Handbook of Microscopy, ed. By Amelinckx, S. et al.,VCH Publishers, Weinheim, Germany, 595 (1997)Google Scholar