| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 92 === CNTs with extremely small radii of curvature, extremely small diameter, hollowness, high chemical stability and high mechanical strength have provided a vast range of applications of CNTs such as electron field emitters, room-temperature transistors, vehicles for hydrogen storage, etc. In particular, the high aspect ratio and high chemical stability of CNTs have enabled them to be used as promising electron emitters.
It is known that CNTs have extremely good property of field emission, the field of low voltage can attract bigger current, which becomes the best materials of cathode emitter in FED.
In this study, we have three different formula to prepare the pastes by three different mixers for increasing the dispersing property. After screen-printing and sintering, the field emitters of CNTs will examine to consider the effect of dispersability on field emission property.
The pretreated CNTs in different ball milling times are also considered in this study. Raman spectroscopy and X-ray diffraction are used to observe the change of CNTs in different milling times. Mixing in the same process, we can compare treated and untreated CNTs which has better dispersion and field emission property.
The results indicate No.3 formula has the best dispersability. And No.1 formula has the best stability for field emission at about 6 V/μm. After ball milling, it can see the better dispensability and lower turn-on field.
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