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

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
DOIs
Publication statusPublished - 12 May 2016

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