Abstract
A new laser material-transfer scheme for transfer printing both the
silver-paste and the carbon-nanotube (CNT) thin film in pattern simultaneously
is reported. The transfer mechanism is discussed and demonstrated to be unlike
to those conventional laser-transfer approaches which only the material on
the laser-irradiated region is transferable, the present scheme is capable
of transferring the materials on the unexposed locations as well. The transferred
CNTs are directly on the top of the silver paste which is a suitable configuration
for application to the CNT field-emission cathodes. Measurements demonstrate
that the fabricated CNT field-emission cathodes exhibit a low turn-on field
of 2.5 V/
$\mu$
m
at current density of 10
$\mu$
A/cm
$^{2}$
. A lifetime test also demonstrates that the device is stable. By
a single laser shot, this study successfully demonstrates that the transferred
CNTs are preserved on the silver paste's surface that requires no subsequent
post-treatment processes. Moreover, all the fabrication steps are executable
at room temperature and in the ambient environment.
© 2014 IEEE
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