Collisions between C 2 60 and alkali-metal ion are investigated by an ab initio molecular dynamics simulation at 1000 K. When Li 1 with kinetic energy ϳ5 eV hits the center of a six-membered ring of C 2 60 , Li@C 60 is created. If either the kinetic energy is lower or the collision occurs off center, the Li 1 ion stays outside, and C 60 is deformed by the shock. In some cases, several bonds of C 60 break after the bombardment; this may make the insertion of alkali-metal ion easier. [S0031-9007(96)00138-X] PACS numbers: 61.46. + w
Production and separation of C60 and C70 as an undergraduate experiment Am.An ultrafine-particle plasma consisting of electrons, positive Kf ions, and large negative C;e ions is produced by introducing "Buckminsterfullerene, C 60" particles into a low-temperature (~0.2 eV) potassium plasma column confined by a strong axial magnetic field. With an increase in the C, fraction, the electron shielding decreases, yielding clear effects on plasma collective phenomena, which are demonstrated for low-frequency electrostatic plasma-wave propagations and instabilities. This plasma might be useful for producing new &-based materials.
In order to understand the effects of plasma parameters on the nanotube formation and further controlled growth, we have investigated the optimal growth condition using a rf plasma-enhanced chemical vapor deposition method. The magnetic field introduced for a magnetron discharge enhances the nanotube growth as a result of the plasma-density increment and the self-bias reduction of a rf electrode. It is also found that the optimum ion flux and ion bombardment energy is a key parameter for the uniform, well-aligned, and density-controlled nanotube growth.
Positive and negative bias-voltages are applied to single-walled carbon nanotubes (SWNTs) in magnetized alkali–metal and alkali–fullerene plasmas. When accelerated ions are irradiated to the SWNTs through plasma sheaths, drastic structural deformations such as deflection and tube cutting of the SWNTs are observed to take place. Furthermore, this phenomenon is found to be accompanied by the fullerene encapsulation inside the SWNTs in the case of the positive-bias application in the alkali–fullerene plasma, giving the possibility that various kinds of atoms and molecules can effectively be intercalated by our plasma method.
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