The electron transport properties of photo- and electron-beam-irradiated C60 films

First-principles calculations of the vibrational spectra of one-dimensionalC60polymers

“…Onoe and others have extensively investigated EB polymerized C 60 films by in situ Fourier-transform infrared spectroscopy, in situ x-ray photoelectron spectroscopy, and in situ scanning tunneling microscopy. [1][2][3][4][5] In EB polymerized films, C 60 molecules coalesce to form tubular linkages and the metallictype resistivity, found by ex situ four-probe measurements to be as low as 7 ⍀ cm, is considerably smaller than that of the insulating solid C 60 ͑10 8 -10 14 ⍀ cm͒. 3 The measured IR spectra show that as polymerization proceeds, supplementary peaks develop around 1340, 1360, and 1390 cm −1 as compared to the pristine C 60 film.…”

Uniformly dimerized C60 film prepared by deposition under in situ photoirradiation

“…The reflection observed at around 14°in the XRD pattern might be attributed to local fcc lattice distortions induced by variant formation. Since it is reported that the two-dimensional hexagonal C60 photopolymer exhibits a semiconducting property, 29 the electrical conductivity of the present C60 films is of great interest. Further investigations of the electrical property as well as the texture and the formation process are in progress.…”

DV‐Xα study on the electronic structure of C120 isomers derived from the general Stone–Wales rearrangement

“…We have investigated the electron‐beam‐induced polymerization of C 60 and found that a peanut‐shaped C 60 polymer is formed and exhibits metallic electron‐transport properties in air at room temperature 1–5. In a recent work 6, we measured the lifetime of photo‐excited carriers of the peanut‐shaped polymer as a function of temperature, using femtosecond time‐resolved spectroscopy 7, and observed the energy gap formation by Peierls instability at below 50 K in a similar manner to quasi‐one‐dimensional (1D) metallic materials such as K 0.3 MO 3 .…”

“…Although there have been hitherto some theoretical reports on the electronic state of 1D peanut‐shaped C 120 isomers 5, 14–16, no attempts to examine the electronic properties of all the C 120 stable isomers, which are derived from GSW rearrangement, have been made until now.…”