Role of extrinsic atoms on the morphology and field emission properties of carbon nanotubes

Chan, L. H.; Hong, K. H.; Xiao, D. Q.; Hsieh, W. J.; Lai, S. H.; Shih, H. C.; Lin, T. C.; Shieu, F. S.; Chen, K. J.; Cheng, H. C.
June 2003
Applied Physics Letters;6/16/2003, Vol. 82 Issue 24, p4334
Academic Journal
Extrinsic atoms were doped into multiwalled carbon nanotubes (MWCNTs) using microwave plasma-enhanced chemical vapor deposition. Doped nitrogen atoms alter the original parallel graphenes into highly curved ones including some fullerene-like structures. Doped nitrogen atoms could replace carbon atoms in MWCNTs and therefore increase the electronic density that enhances the electron field emission properties. On the other hand, the incorporation of boron into the carbon network apparently increases the concentration of electron holes that become electron traps and eventually impedes the electron field emission properties. Fowler-Nordheim plots show two different slopes in the curve, indicating that the mechanism of field emission is changed from low to high bias voltages. β values could be increased by an amount of 42% under low bias voltages and 60% under high bias voltages in the N-doped MWCNTs, but decreased by an amount of 8% under low bias region and 68% under high bias voltage in the B-doped MWCNTs.


Related Articles

  • Universal field-emission model for carbon nanotubes on a metal tip. Zhong, D. Y.; Zhang, G. Y.; Liu, S.; Sakurai, T.; Wang, E. G. // Applied Physics Letters;1/21/2002, Vol. 80 Issue 3, p506 

    Electron-field-emission properties have been investigated systematically for carbon nanotubes (CNTs) fabricated on a metal tip. With a vacuum gap of 0.7 mm, the threshold field is as low as 0.7 V/μm and the current density approaches 10 mA/cm[sup 2] at an electronic field of 1.0 V/μm. The...

  • Study of the field-screening effect of highly ordered carbon nanotube arrays. Suh, Jung Sang; Jeong, Kwang Seok; Lee, Jin Seung; Han, Intaek // Applied Physics Letters;4/1/2002, Vol. 80 Issue 13, p2392 

    We have studied the field-screening effect provoked by the proximity of neighboring tubes by changing the tube height of highly ordered carbon nanotubes fabricated on porous anodic aluminum oxide templates. The field emission was critically affected by the tube height that protruded from the...

  • Uniform field emission from aligned carbon nanotubes prepared by CO disproportionation. Lee, Jin Seung; Suh, Jung Sang // Journal of Applied Physics;12/15/2002, Vol. 92 Issue 12, p7519 

    We have fabricated aligned carbon nanotubes (CNTs) by disproportionation of CO on a well-ordered Co nanowire array prepared on a porous anodic aluminum oxide (AAO) template using overdeposition and etching techniques, and studied their field emission properties. CNTs fabricated at 600°C were...

  • Field emission of large-area and graphitized carbon nanotube array on anodic aluminum oxide template. Gao, Han; Mu, Cheng; Wang, Fan; Xu, Dongsheng; Wu, Kai; Xie, Youchang; Liu, Shuang; Wang, Enge; Xu, Jun; Yu, Dapeng // Journal of Applied Physics;5/1/2003, Vol. 93 Issue 9, p5602 

    Large-area, graphitized, and patterned carbon nanotube (CNT) arrays were prepared via cracking of ethylene on an open-ended anodized aluminum oxide (AAO) template that also served as a catalyst. With ion-milling and gold coating techniques, ohmic contact between the CNTs and electrode for field...

  • In-situ atomistic observation of carbon nanotubes during field emission. Kuzumaki, Toru; Horiike, Yasuhiro; Kizuka, Tokushi // AIP Conference Proceedings;2001, Vol. 590 Issue 1, p281 

    The structural variation in the tip of carbon-nanotube during field emission was in-situ observed at an atomic scale by high-resolution transmission electron microscopy equipped with newly designed two specimen holders system. The nanotubes which were sticking out of the rod specimen were fixed...

  • Saturation of emission current from carbon nanotube field emission array. Lim, Seong Chu; Jeong, Hee Jin; Shin, Young Min; Kim, Keun Soo; Kim, Won Seok; Park, Young Soo; Choi, Young Chul; An, Kay Hyeok; Bae, Dong Jae; Lee, Young Hee // AIP Conference Proceedings;2001, Vol. 590 Issue 1, p221 

    Field emission properties of carbon nanotube field emission arrays (CNT-FEA) that are exposed to various gases were studied. The existence of the hysteresis loop during the rise and fall bias sweep stems from gas adsorbates. We observed that gas adsorbates played an important role in the...

  • Triode-type field emission array using carbon nanotubes and a conducting polymer composite prepared by electrochemical polymerization. Jin, Y. W.; Jung, J. E.; Park, Y. J.; Choi, J. H.; Jung, D. S.; Lee, H. W.; Park, S. H.; Lee, N. S.; Kim, J. M.; Ko, T. Y.; Lee, S. J.; Hwang, S. Y.; You, J. H.; Yoo, Ji-Beom; Park, Chong-Yun // Journal of Applied Physics;7/15/2002, Vol. 92 Issue 2, p1065 

    We report a method to fabricate carbon nanotubes (CNT)/conducting polymer composite films for the application of CNTs to field emission displays. The composite was prepared by a combination of electrochemical polymerization of pyrrole and electrophoretic deposition of CNTs. We obtained a uniform...

  • Influences of the surface reactions on the field emission from multiwall carbon nanotubes. Dong, Changkun; Gupta, Mool C. // Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p159 

    Field emission characteristics from multiwall carbon nanotubes were studied under various gas environments. The experiments on field emission revealed several surface reactions under high-vacuum operating conditions. The Fowler-Nordheim (F-N) analysis showed a field emission regime dominated by...

  • Controlling field-emission patterns of isolated single-walled carbon nanotube rope. Yu Tong; Seong Chu Lim; Kyung Ah Park; Hee Jin Jeong; Seung Yoi Jeong; Young Hee Lee; Chang Liu; Hui-Ming Cheng; Yoon Choi // Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p043114 

    We report a method of controlling field-emission patterns from an isolated single-walled carbon nanotube (SWCNT) rope. By positioning two soda-lime glass flakes on both sides of a SWCNT rope, we found an anomalous current jump, enlarging the field emission current above the threshold bias...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics