Improved field emission characteristics of screen-printed CNT-FED cathode by interfusing Fe/Ni nano-grains

Carbon nanotube (CNT) cathode with and without interfusing nano-metal particles was prepared using screen-printing technology. For the good electric conductivity of metal, the turn-on electric field of the Fe/Ni and CNT composite film (Fe/CNT film) decreases to 1.42 V/μm comparing with the usual CNT film of 2.45 V/μm, and the emission current increases from 60 μA to 440 μA at an applied electric field of 2.3 V/μm. Furthermore, the field enhancement factor β increases from 1721 to 3242. By characterizing the prepared samples via X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), it is found that carbide Fe3C phase is formed in Fe/CNT film, and the metal particles are filled in the interspaces of CNTs. It is evaluated that benefiting from good electrical conductivity and chemical inertness of metal carbide, Fe/CNT film achieves high emission characteristics and emission uniformity.

[1]  T. Bodziony,et al.  Nanocrystalline Iron-Carbon Fillers for Polymers , 2004 .

[2]  B. Chalamala,et al.  Current saturation mechanisms in carbon nanotube field emitters , 2000 .

[3]  Zhu Changchun,et al.  Field emission display with carbon nanotubes cathode: prepared by a screen-printing process , 2002 .

[4]  R. Fowler,et al.  The Analysis of Photoelectric Sensitivity Curves for Clean Metals at Various Temperatures , 1931 .

[5]  Mool C. Gupta,et al.  Influences of the surface reactions on the field emission from multiwall carbon nanotubes , 2003 .

[6]  R. Fowler,et al.  Electron Emission in Intense Electric Fields , 1928 .

[7]  R. Schlesser,et al.  Role of adsorbates in field emission from nanotubes , 2002 .

[8]  Robert P. H. Chang,et al.  A nanotube-based field-emission flat panel display , 1998 .

[9]  Yongsheng Shi,et al.  Large area screen-printing cathode of CNT for FED , 2003 .

[10]  Jeunghee Park,et al.  Temperature effect on the growth of carbon nanotubes using thermal chemical vapor deposition , 2001 .

[11]  László Forró,et al.  Field emission properties of multiwalled carbon nanotubes , 1998 .

[12]  R. Nemanich,et al.  Field emission properties of nitrogen-doped diamond films , 1999 .

[13]  Jong-Wan Park,et al.  Growth of carbon nanotubes by chemical vapor deposition , 2001 .

[14]  K. G. Ong,et al.  Effect of purification of the electrical conductivity and complex permittivity of multiwall carbon nanotubes , 2001 .

[15]  Proceedings of the Royal Society (London) , 1906, Science.

[16]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[17]  D. Choe,et al.  Simple approach for the fabrication of carbon nanotube field emitter using conducting paste , 2005 .

[18]  I. Lin,et al.  Characteristics of flat panel display using carbon nanotubes as electron emitters , 2000 .