Fabrication and Modification of New Carbon Based Nanomaterials for Field Emission Devices

• Main Authors: Chia-Lun Tsai, 蔡佳倫
• Other Authors: Chia-Fu Chen
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/292f73

博士 === 國立交通大學 === 材料科學與工程系所 === 92 === Field emission display (FED) is a promising flat panel display in which the images are formed from large array of pixels, each addressed by controllable field emission sources. Recently, carbon based nanomaterials have attracted great interest owing to their potential application of field emission. This dissertation mainly aims at the improvement of carbon based nanomaterials on field emission characteristic. Research can be divided into two following categories. First is modifying materials’ property in order to enhance their field emission characteristic. Second is fabricating new carbon based nanomaterials to increase their field emission currents by using their unique properties. The bias effect; N or P-type dopants and diamond-like carbon cladding are used to improve field emission characteristics of materials. Experimental results indicate that bias effect would not only increase the growth rate but also lead to the well-aligned inclination. Doping additional electrons or holes into carbon material system results in the increase of field emission currents. In the fabrication of new material field, graphite nanotip and itself capped with Cr nano particles have been first reported in the world. Compared to the hollow structure of nanotubes, graphite nanotips display the solid body and well aligned growth direction. The needle-like shape causes the electrons easily induced and larger field enhancement (β). Pre-deposition of Cr thin film will form the nanocrystalline chromium carbides on the top of the individual graphite nanotips, providing higher surface conductivity for electrons transportation. This self-alignment could be used in many applications. Moreover, low threshold voltage and high current density characterization is successfully achieved by using gated structure device.