For each measurement two images were taken, one with the emission polarizer oriented parallel to the excitation polarizer (I | | ) and one with the emission polarizer oriented perpendicular to the excitation polarizer (I ⊥ ).
To eliminate polarization artifacts in the intensity decay, data were collected under magic angle conditions with the excitation light polarized normal to the laboratory plane, 0°, and the emission polarizer oriented at 54.7° [ 20].
The defective (bamboo-structure) structures of CNTs have been suggested for the enhanced emission performance of randomly oriented nanotube samples.
Using the same method, purified MWNT were also spin coated over the graphitized carbon paper, to obtain field emission arrays of randomly oriented purified MWNT (Sample C).
For the fabrication of field emission arrays of randomly oriented as-grown MWNT over carbon paper, as-grown MWNT were first dispersed in 1, 2 dichloroethane (DCE).
Therefore, for a CCHP system, an emission strategy (ES) would be an operational strategy oriented to minimize emission of pollutants.
It is suggested that not only nanotube tips but open edges on the body also act as active emission sites in the randomly oriented geometry of these structures giving enhanced emission characteristics.
Intensity was recorded at the four possible combinations for the orientations of excitation and emission polarizers: both along the vertical direction (IVV), both oriented horizontally (IHH), the excitation polarizer oriented vertically and the emission horizontally (IVH), or vice versa (IHV).
It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures.
Comparative field emission measurements showed that patterned CNT films and that with randomly oriented morphology had superior emission characteristics with threshold field as low as ~2.0 V/μm.
Field emission properties are compared with randomly oriented multi-walled and single walled carbon nanotube field emitters obtained by spin coating on to carbon fabric.
