Kiselev, N. A., Kumskov, A. S., Zhigalina, V. G., Vasiliev, A. L., Sloan, J., Falaleev, N. S., Verbitskiy, N. I. and Eliseev, A. A. (2016). The structure and continuous stoichiometry change of 1DTbBr(x)@SWCNTs. J. Microsc.., 262 (1). S. 92 - 102. HOBOKEN: WILEY-BLACKWELL. ISSN 1365-2818

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Abstract

HRTEM and HAADF STEM of 1DTbBr(x)@SWCNT meta-nanotubes reveal three structural modifications of 1D nanocrystals within single wall carbon nanotube channels attributed to a different stoichiometry of the guest crystal. For SWCNTs with diameters D-m > 1.4 nm a most complete tetragonal unit cell is observed. When crystallization occurs inside SWCNT with D-m < 1.4 nm 1D TbBrx crystal deforms a nanotube to elliptical shape in cross section. In this case the 1D crystal unit cell becomes monoclinic, with possible loss of a part of bromine atoms. Two modifications of a monoclinic unit cell appear. One of them is characterized by single or pair vacancies in the structure of the 1D crystal. Another structure is explained by peripheral and central bromine atoms loss. An appearance of such modifications can be stimulated by electron irradiation. The loss of bromine atoms is in agreement with chemical analysis data. Electronic properties of obtained meta-nanotubes are investigated using optical absorption and Raman spectroscopy. It is shown that intercalation of terbium bromide into SWCNTs leads to acceptor doping of SWCNTs. According to local EDX analysis and elemental mapping this doping can arise from significant stoichiometry change in 1D nanocrystal indicating an average Tb:Br atomic ratio of 1:2.8 0.1.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Kiselev, N. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kumskov, A. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhigalina, V. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vasiliev, A. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sloan, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falaleev, N. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Verbitskiy, N. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eliseev, A. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-280136
DOI: 10.1111/jmi.12348
Journal or Publication Title: J. Microsc..
Volume: 262
Number: 1
Page Range: S. 92 - 102
Date: 2016
Publisher: WILEY-BLACKWELL
Place of Publication: HOBOKEN
ISSN: 1365-2818
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
WALLED CARBON NANOTUBES; 1D; NANOCRYSTALS; CRYSTALSMultiple languages
MicroscopyMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28013

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