Reversible Intercalation of Charged Iodine Chains into Carbon Nanotube Ropes

Abstract

We report intercalation of charged polyiodide chains into the interstitial channels in a singlewall carbon nanotube (SWNT) rope lattice, suggesting a new carbon chemistry for nanotubes, distinctly different from that of graphite and C 60 . This structural model is supported by results from Raman spectroscopy, x-ray diffraction, Z-contrast electron microscopy, and electrical transport data. Iodine-doped SWNTs are found to be air stable, permitting the use of a variety of techniques to explore the effect of charge transfer on the physical properties of these novel quantum wires.[S0031-9007(98)

Raman spectroscopy of iodine-doped double-walled carbon nanotubes

“…Iodine ions doping of DWCNT samples was done following the procedure previously described for doping single-walled nanotube bundles to saturation [14].…”

Guest induced transformations of assembled pyridyl bis-urea macrocycles

“…No other iodine peaks were observed in this region suggesting that only one type of iodine was present. 15 The I MNN Auger line and I3d XPS spectrum for NaI reference were measured and the Auger parameter obtained. 16 The 1ÁI 2 sample showed a similar Auger parameter, which suggested that iodine acquired a partial negative charge upon complex formation.…”

Phonon contribution to electrical resistance of acceptor-doped single-wall carbon nanotubes assembled into transparent films

“…The best value of R sq = 89 ohm/sq has been obtained for 90%-transparent SWCNT films fabricated using aerosol technology, which leads to an almost complete elimination of SWCNT bundling (known for such technique as arc discharge [17]) and a substantial increase in SWCNT lengths via the suppression of bundling-induced growth termination [16] The sheet resistance of SWCNT films can be significantly decreased by acid(HNO 3 ) treatment that results in a high level of p-type doping [9,14,18,19]. The other examples of strong acceptors for p-type doping are iodine and cuprous chloride (CuCl) [20][21][22][23][24]. The iodine-doped SWCNT films may have the value of R sq as low as 70 ohm/sq [22].…”