Tunable field emission properties of carbon nanotube arrays by engineering Fe catalysts |
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| Authors: | Bin Zhao Zhenlun Song |
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| Affiliation: | a School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
b Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China |
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| Abstract: | High-quality carbon nanotube (CNT) arrays composed of nanotubes with different diameters and wall numbers were synthesized by water-assisted chemical vapor deposition (CVD) from engineered Fe catalysts. Interestingly, the distribution of nanotube diameter and wall number broadened over 2.5 times as the catalytic Fe thickness increased. The mean diameter and wall number of nanotubes increased monotonically with the Fe thickness, while the calculated CNT area density within an array dropped about 32 times. Field emission measurements revealed that the turn-on voltage for CNT arrays decreased from 3.5 to 2.5 V/µm with the increased catalytic Fe thickness. It was believed that the screening effect from the proximity of neighboring nanotubes has a dominant influence than the CNT diameter on the resulting turn-on voltage. |
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| Keywords: | Nanomaterials Chemical vapor deposition Carbon nanotube array Field emission |
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