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Morphological changes in carbon nanohorns under stress: a combined Raman spectroscopy and TEM study
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SYSNO ASEP 0472533 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Morphological changes in carbon nanohorns under stress: a combined Raman spectroscopy and TEM study Author(s) Peňa-Alvarez, M. (ES)
del Corro, Elena (UFCH-W)
Langa, F. (ES)
Baonza, V. G. (ES)
Taravillo, M. (ES)Source Title RSC Advances. - : Royal Society of Chemistry - ISSN 2046-2069
Roč. 6, č. 55 (2016), s. 49543-49550Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords high-pressure ; failure behavior ; graphitic carbon Subject RIV CF - Physical ; Theoretical Chemistry Institutional support UFCH-W - RVO:61388955 UT WOS 000377577800030 DOI https://doi.org/10.1039/c5ra27162b Annotation In this work, we present the first study of highly compressed carbon nanohorns (CNHs). The experiments were performed in a sapphire anvil cell and the morphological changes induced in the CNHs samples were monitored simultaneously by Raman spectroscopy and subsequently by transmission electron microscopy. CNHs samples subjected to a maximum stress of 8 GPa in a single direct compression cycle showed broadened Raman spectra, corresponding to carbonaceous regions with graphite-like structures, surrounded by debundled dahlia-like structures. However, samples subjected to a moderate stress single cycle (2 GPa) exhibited morphological changes from dahlia-like to bud-like structures. Finally, consecutive moderate stress cycles led to the aggregation of such bud spheres towards the formation of a laminar material with horn-like structures at the edges; a very promising configuration for targeted functionalization. This study demonstrates the advantages of using stress for pretreating CNHs samples for subsequent reactivity and functionalization studies. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2017
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