We have encapsulated adamantane (C10H16) in single- and multi-walled carbon nanotubes. Adamantane is a high symmetry cage like molecule with point group symmetry Td and can be considered as a hydrogen-terminated diamond fragment. We confirmed and identified the successful filling by high resolution transmission electron microscopy, 13C nuclear magnetic resonance, infrared and Raman spectroscopy. 13C nuclear magnetic resonance of the adamantane filled nanotubes reveals that the adamantane molecules stop rotating after encapsulation. A blue-shift of the Raman active radial breathing modes of the carbon nanotubes supports this and suggests a significant interaction between encapsulated adamantane molecules and the single wall nanotubes. The encapsulated adamantane molecules exhibit red shifted infrared C-H vibration modes which we assign to a slight elongation of the C-H bonds. We observe both a nanotube diameter dependence of the adamantane filling ratio and a release rate of adamantane from the CNTs that depends on the CNT diameters.
Bibliographical noteFunding Information:
M.G. Yao and T. Wågberg thanks Wenner-Gren foundation for support. T. Wågberg thanks Carl tryggers foundation, Magnus Bergvalls foundation, Swedish research council (Dnr:621-2010-3973) and the young researcher award for support. C. Goze-Bac thanks the Languedoc-Roussillon and the Conseil Scientifique of the Universite’ Montpellier 2. We thank Professor Dan Johnels for stimulating discussions.
ASJC Scopus subject areas
- General Chemistry
- General Materials Science