0472533 - ÚFCH JH 2017 RIV GB eng J - Journal Article
Peňa-Alvarez, M. - del Corro, Elena - Langa, F. - Baonza, V. G. - Taravillo, M.
Morphological changes in carbon nanohorns under stress: a combined Raman spectroscopy and TEM study.
RSC Advances. Roč. 6, č. 55 (2016), s. 49543-49550. ISSN 2046-2069. E-ISSN 2046-2069
Institutional support: RVO:61388955
Keywords : high-pressure * failure behavior * graphitic carbon
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.108, year: 2016 ; AIS: 0.59, rok: 2016
DOI: https://doi.org/10.1039/c5ra27162b

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.
Permanent Link: http://hdl.handle.net/11104/0269825