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URN etd-0817110-154438 Statistics This thesis had been viewed 2433 times. Download 477 times. Author Jian-Min Jeng Author's Email Address No Public. Department Electro-Optical Engineering Year 2009 Semester 2 Degree Ph.D. Type of Document Doctoral Dissertation Language English Page Count 177 Title Fabrication and Modification of Carbon Nano Materials for Electron Field Emission Application Keyword Carbon nanotube Electron field emission Carbon nanoflake Carbon nanoflake Electron field emission Carbon nanotube Abstract In the study, the carbon materials form the electron field emitter, and successfully improved by various surface treatments of the defects. Two kinds of electron field emission source of carbon nanoflakes (CNFs) and commercial graphite flake were used in this study.
We used commercial graphite flake powder and tried to improve its field emission properties. Commercial flake graphite powder size is micron scale; the turn-on field is about 7.7 V/μm. By the surface modification of hydrogen heat treatment can reduce the turn-on field to 4.3 V/μm. The turn-on field is further reduced to 1.9 V/μm by heat treatment introduced into acetylene and hydrogen, owing to the growth of CNT on above.
Developed in the laboratory of the two-dimensional structure of the CNFs, the height and thickness of the CNFs are micron and nano-scale, vertical upright on the substrate. We developed the CNFs by RF magnetron sputtering since the equipment costs and production complexity are lower than the chemical vapor deposition method. Experiment observed the formation of CNFs in the manner and process parameters for the field emission characteristics of CNF and surface morphology. We use heat and drape management to improve field emission properties of CNFs. With carbon-coated treatment makes the field emission from the turn-on field of 5.8 V/μm significantly reduced to 2.3 V/μm. The carbon-coated handle and improve their methods can be carried out under 500 ˚C, and this process can be applied to the glass substrate process.
Finally we fabricated the 7-inch field emission backlight unit with Tatung Company and Chunghwa Picture Tubes cooperation and the backlight unit has successfully driven show with 7-inch digital photo frame.
Advisor Committee Wen-Ching Shih - advisor
I-Nan, Lin - co-chair
Jason Lo - co-chair
Jeff Tsai - co-chair
Shinn-Shyong, Tzeng - co-chair
Shyan-Kay, Jou - co-chair
Files Date of Defense 2010-05-07 Date of Submission 2010-08-18