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  Encapsulation of copper and zinc oxide nanoparticles inside small diameter carbon nanotubes

Großmann, D., Dreier, A., Lehmann, C. W., & Grünert, W. (2015). Encapsulation of copper and zinc oxide nanoparticles inside small diameter carbon nanotubes. Microporous and Mesoporous Materials, 202, 189-197. doi:10.1016/j.micromeso.2014.09.057.

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 Creators:
Großmann, Dennis1, Author
Dreier, Axel2, Author              
Lehmann, Christian W.2, Author              
Grünert, Wolfgang1, Author
Affiliations:
1Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, P.O. Box 102148, D-44780 Bochum, Germany, ou_persistent22              
2Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              

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Free keywords: Carbon nanotubes; Filling; Nanoparticles; Cu; ZnO
 Abstract: Copper and zinc oxide nanoparticles have been reproducibly deposited into carbon nanotubes (CNT) of 6–7 nm internal diameter via simple impregnation techniques with different metal salts followed by thermal decomposition of the precursors and reduction in H2 in case of Cu. Oxygen functionalization via a gas-phase method involving thermal shocks was a critical step while traditional functionalization with nitric acid resulted in failures. Intra-CNT location of CuO particles could be proven by STEM images, and was examined by TEM for materials prepared by various routes. It was found that Cu and Zn oxide nanoparticles could be deposited throughout the whole interior CNT space. The filling capacity depended on the preparation conditions, on conditions of subsequent precursor decomposition, and on the inner diameter of the CNTs. After the reduction of the CuO nanoparticles, XRD, XAFS, and N2O reactive frontal chromatography indicated a bimodal particle size distribution due to the presence of agglomerates outside the CNTs. To enhance selectivity for endohedral location, a washing step with HNO3 with the inner CNT space blocked by xylene was applied to selectively remove aggregates in the outer space. Based on the best procedures for introduction of CuO and ZnO, a bimetallic CuZnO@CNT sample was prepared via a consecutive preparation route.

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Language(s): eng - English
 Dates: 2014-06-062014-10-022015-01-15
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.micromeso.2014.09.057
 Degree: -

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Title: Microporous and Mesoporous Materials
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 202 Sequence Number: - Start / End Page: 189 - 197 Identifier: ISSN: 1387-1811
CoNE: https://pure.mpg.de/cone/journals/resource/954926228401