2004•Journal of Electron DevicesRequires access

Study of Thick Film Process for Carbon Nanotubes Field Emission Cathode

Yongsheng Shi

Abstract

Thick film process used to prepare carbon nanotube(CNT) cathode is studied. By investigation of CNT paste and sintering process, we can obtain uniform, flat CNT thick films with good field emission performance. The optimum sintering temperature is 480 ℃ in air, under which the thick film adheres tightly to Si substrate and CNT avoids to be oxidated .The optimum proportion of Ag in the CNT paste is about 4.2%, beyond which emission current under high voltages will decrease evidently . The measurements reveal that field emission of the CNTs cathode turns on with a field of (2.4 V/μm) and emission current density can attain to 27.8 μA/cm~2 at 5 V/μm. By using CNT paste containing organic binder the demomtration of emission image can be improved.

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Key concepts: Field electron emission, Carbon nanotube, Materials science, Cathode, Sintering, Substrate (aquarium), Current density, Composite material