Pressure-polymerization of C60 molecules in a carbon nanotube

Abstract

Structural property of a C$_{60}$-peapod sample under high pressure up to 25 GPa was investigated by in-situ synchrotron X-ray diffraction measurements with a diamond anvil cell. It was observed that C$_{60}$-C$_{60}$ distance in a carbon nanotube decreases with pressure from 0.956 nm at 0.1 MPa down to 0.845 nm at 25 GPa. It was also found that the distance value on complete release of pressure after compression remained to be much smaller than the its initial value. These experimental results indicate the polymerization of C$_{60}$ molecules in a carbon nanotube. * The Manuscript Click here to download The Manuscript: kawasaki.tex also found that the distance value on complete release of pressure after compression remained to be much smaller than the its initial value. These experimental results indicate the polymerization of C 60 molecules in a carbon nanotube.

Properties of K,Rb-intercalated C60 encapsulated inside carbon nanotubes called peapods derived from nuclear magnetic resonance

“…The starting materials, SWNTs and 25% 13 C enriched C 60 , were purchased from Carbon Solution, Inc., and MER Corporation, respectively. The magnetic purification is well described in Ref.…”

“…The 13 C NMR experiments were carried out in Montpellier using a Bruker ASX200 spectrometer at magnetic field of 4.2 T and Larmor frequency of 50.3 MHz. The 13 C NMR spectrum was performed using Han echo synchronized with a rotor spinning at 10 kHz.…”

“…[17][18][19][20][21][22][23][24][25][26][27][28][29][30] For carbon nanotubes studies, 13 C NMR has not been used as frequently, although some studies have been reported recently to study their structural properties, 25 their electronic properties, 26,27,29 their magnetic properties, 22 or the dynamic properties of molecules encapsulated inside carbon nanotubes. 20,21 In this work, we provide additional data in detail on how the intercalation of peapods with alkali metals influences the magnetic and electronic properties.…”

“…11 However, only very few attempts have been made to modify encapsulated species. At present, these are intercalation of C 60 with alkali metals, 12 high pressure polymerization of C 60 , 13,14 insertion of C 60 inside double-walled carbon nanotubes (DWNTs), 15 and catalyst growth of nanotubes inside SWNTs. 16 Tuning the electronic and magnetic properties of peapods is of paramount scientific and technological interest.…”

“…Properties of K,Rb-intercalated C 60 encapsulated inside carbon nanotubes called peapods derived from nuclear magnetic resonance We present a detailed experimental study on how magnetic and electronic properties of Rb,Kintercalated C 60 encapsulated inside carbon nanotubes called peapods can be derived from 13 C nuclear magnetic resonance investigations. Ring currents do play a basic role in those systems; in particular, the inner cavities of nanotubes offer an ideal environment to investigate the magnetism at the nanoscale.…”