High Stability Electron Field Emitters Synthesized via the Combination of Carbon Nanotubes and N2-Plasma Grown Ultrananocrystalline Diamond Films

Ting Hsun Chang, Ping Yen Hsieh, Srinivasu Kunuku, Shiu Cheng Lou, Manoharan Divinah, Keh Chyang Leou, I. Nan Lin, Nyan Hwa Tai

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

An electron field emitter with superior electron field emission (EFE) properties and improved lifetime stability is being demonstrated via the combination of carbon nanotubes and the CH4/N2 plasma grown ultrananocrystalline diamond (N-UNCD) films. The resistance of the carbon nanotubes to plasma ion bombardment is improved by the formation of carbon nanocones on the side walls of the carbon nanotubes, thus forming strengthened carbon nanotubes (s-CNTs). The N-UNCD films can thus be grown on s-CNTs, forming N-UNCD/s-CNTs carbon nanocomposite materials. The N-UNCD/s-CNTs films possess good conductivity of σ = 237 S/cm and marvelous EFE properties, such as low turn-on field of (E0) = 3.58 V/μm with large EFE current density of (Je) = 1.86 mA/cm2 at an applied field of 6.0 V/μm. Moreover, the EFE emitters can be operated under 0.19 mA/cm2 for more than 350 min without showing any sign of degradation. Such a superior EFE property along with high robustness characteristic of these combination of materials are not attainable with neither N-UNCD films nor s-CNTs films alone. Transmission electron microscopic investigations indicated that the N-UNCD films contain needle-like diamond grains encased in a few layers of nanographitic phase, which enhanced markedly the transport of electrons in the N-UNCD films. Moreover, the needle-like diamond grains were nucleated from the s-CNTs without the necessity of forming the interlayer that facilitate the transport of electrons crossing the diamond-to-Si interface. Both these factors contributed to the enhanced EFE behavior of the N-UNCD/s-CNTs films.

原文English
頁(從 - 到)27526-27538
頁數13
期刊ACS Applied Materials and Interfaces
7
發行號49
DOIs
出版狀態Published - 2015 12月 16

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)

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