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The magneto resistive effect in nanocystalline diamond films was investigated at room temperature. The nanocystalline diamond films on silicon were deposited by hot filament chemical vapor deposition. The experimental results showed that a striking magneto resistive effect in p-type doped nanocystalline diamond films was observed. The relative changes in the resistivity of the films were about 0.3 at room temperature under the magnetic field of 5T, and increased with decreasing the geometrical size of the devices. It was found that the magneto resistive effect in the nanocystalline diamond films was less than that of epitaxial diamond films. This was ascribed to a large number of grain boundaries. The results are discussed in detail. [ABSTRACT FROM AUTHOR]

The electron drag effect of carbon nanotubes in electrolyte was studied. The carbon nanotubes in this study were synthesized by hot filament CVD. The experimental results showed there is a striking induced voltage on the surface of carbon nanotubes in flowing electrolytes. It was also found that the induced voltage was closely depended on the electrolyte concentration. The response time of induced voltage was relative to the kind and concentration of electrolytes. The origin of induced voltage was discussed. [ABSTRACT FROM AUTHOR]