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

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons58527

Dreier,  Axel
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons58744

Lehmann,  Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0025-040D-A
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.