Confined adamantane molecules assembled to one dimension in carbon nanotubes

Abstract

We have encapsulated adamantane (C 10 H 16 ) in single-and multi walled carbon nanotubes.Adamantane is a high symmetry cage like molecule with point group symmetry, T d and can be considered as a hydrogen-terminated diamond fragment. We confirmed and identified the successful filling by high resolution transmission electron microscopy, 13 C nuclear magnetic resonance, and 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 fill ratio and a release rate of adamantane from the CNTs that depends on the CNT diameters.

Raman study of graphene nanoribbon analogs confined in single‐walled carbon nanotubes and their high‐pressure transformations

“…Raman spectroscopy is a powerful and nondestructive tool to characterize the encapsulation of organic molecules inside carbon nanotubes, which is widely used in the study of carbonaceous materials. Figure S1 shows the Raman spectra of pristine SWCNTs and GNRAs@SWCNTs synthesized at 400 °C.…”

“…S1(a)). Such a shift, as reported in other SWCNTs doped with organic molecules, is an important indication for the filling of dopant inside a tube, which is a result from the appearance of interactions between guest molecules and host tubes. Note that the G‐band is extremely sensitive to the charge transfer between the encapsulated molecules and the tubes, while no visible shift in this band (Fig.…”

“…SWCNTs can be used a one‐dimensional nanoreactor for accommodating guest and allowing the reactions of the confined materials . Moreover, filling carbon nanotubes can form various novel hybrid structures, which is an efficient approach to tune nanotube properties without losing their unique structure. For example, it has been reported that encapsulation provides possibilities to modulate the optical band gap of carbon nanotubes upon C 60 or metallofullerenes insertions.…”

Silica Nanowire Arrays for Diffraction‐Based Bioaffinity Sensing

“…Similar changes in IR spectra have also been observed for the encapsulation of various diamondoid precursors 19. 20, 25 Note that residual outside molecules have been removed and thus make no spectral contribution. After the reaction, the outer surfaces of the DWCNTs were thoroughly washed with an organic solvent (see the Supporting Information).…”

Template Synthesis of Linear‐Chain Nanodiamonds Inside Carbon Nanotubes from Bridgehead‐Halogenated Diamantane Precursors

“…TheIRanalyses strongly suggest that the structure of the resulting product should be related to the skeleton of the diamantane precursor.T he slight shift and sharpening of the bands were attributed to the confinement of the molecular motion in the narrow interior of the DWCNTs.S imilar changes in IR spectra have also been observed for the encapsulation of various diamondoid precursors. [19,20,25] Note that residual outside molecules have been removed and thus make no spectral contribution. After the reaction, the outer surfaces of the DWCNTs were thoroughly washed with an organic solvent (see the Supporting Information).…”