Pulsed laser deposition-assisted patterning of aligned carbon nanotubes modified by focused laser beam for efficient field emission |
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| Authors: | N Saurakhiya FC Cheong ATS Wee JY Lin CH Sow |
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| Affiliation: | a Department of Physics, BLK S12, Faculty of Science, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
b National University of Singapore Nanoscience and Nanotechnology Initiative, BLK S13, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore |
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| Abstract: | Patterned carbon nanotube (CNT) arrays have been synthesized on patterned substrates created via pulsed laser deposition (PLD) of the precursor catalyst films with a mask. Arrays of CNTs in square and hexagonal patterns with tube lengths of 8 μm and 16 μm were created on silicon or quartz substrates, respectively. Using the method of laser cutting, as-grown CNT patterns were pruned by focused He-Ne laser beam. It is found that after pruning, CNTs tend to cluster together and form welded junctions. The comparison of field emission properties of CNTs before and after pruning shows that laser modification of CNT morphologies effectively enhanced the emission currents. |
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| Keywords: | Carbon nanotubes Laser irradiation Scanning electron microscopy Transmission electron microscopy Field emission |
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