Počet záznamů: 1
Morphological changes in carbon nanohorns under stress: a combined Raman spectroscopy and TEM study
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SYSNO ASEP 0472533 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Morphological changes in carbon nanohorns under stress: a combined Raman spectroscopy and TEM study Tvůrce(i) Peňa-Alvarez, M. (ES)
del Corro, Elena (UFCH-W)
Langa, F. (ES)
Baonza, V. G. (ES)
Taravillo, M. (ES)Zdroj.dok. RSC Advances. - : Royal Society of Chemistry - ISSN 2046-2069
Roč. 6, č. 55 (2016), s. 49543-49550Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova high-pressure ; failure behavior ; graphitic carbon Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000377577800030 DOI https://doi.org/10.1039/c5ra27162b Anotace 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. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2017
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