Abstract
In this work we used a new approach for electrical contact improvement
between multi-wall carbon nanotubes and metallic electrodes by localized
laser heating. The nanotubes were suspended, using the dielectrophoresis
technique, over a gap of 1 mu m m width and 5 mu m m depth connecting
the ends of the patterned electrodes. Subsequently, the as deposited
nanotubes were directly heated, in ambient atmosphere, by a laser having
a wavelength of 473nm. The Raman signal of the nanotubes, through its G
band displacement, was used to determine the process temperature and
this parameter was controlled by calibrating the incident power density.
The changes in the nanotubes morphology were evaluated using scanning
electron microscopy, Raman spectroscopy and electrical measurements.
After calibration, this method was employed for improving the electrical
contact between suspended multi-wall carbon nanotubes and different
electrodes (W, Ti and Au). The reduction in the electrical resistance
was between 80 - 99%, 80 - 95% and 10 - 90% for W, Ti and Au
electrodes, respectively, resulting in contact resistivity as low as
similar to 1 k Omega mu m(2.)
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