Morphological changes in carbon nanohorns under stress: a combined Raman spectroscopy and TEM study

Miriam Pena Alvarez, Elena del Corro, Fernando Langa, Valentin G Baonza, Mercedes Taravillo

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 dahlias-like structures. However, samples subjected to a moderate stress single cycle (2 GPa) exhibit morphological changes from dahlia-like to bud-like structures. Finally, consecutive moderate stress cycles leads to the aggregation of such bud spheres towards the formation of a laminar material with horns-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.
Original languageEnglish
JournalRSC Advances
Publication statusPublished - 12 May 2016


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