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Enhanced surface morphologies of screen-printed carbon nanotube films by heat treatment and their field-emission properties |
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| Authors: | Hyeon Jae Lee Woo Sung Cho Jai Kyeong Kim Byeong Kwon Ju |
| Affiliation: | a Display and Nanosystem Lab., College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea b Department of Materials Science and Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea c Department of Physics, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea d Korea Institute of Science and Technology, Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea e School of Electrical Engineering, College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea |
| Abstract: | A heating process for obtaining free-standing carbon nanotube emitters is presented with the aim of improving field-emission properties from the screen-printed multiwalled carbon nanotube (MWCNT) films. Using an atmosphere with an optimum combination of nitrogen and air for heat treatment of CNT films, the CNT emitters can be made to protrude from the surface. This allows for a high emission current and the formation of very uniform emission sites without special surface treatment. The morphological change of the CNT film by this technique has eliminated additional processing steps, such as surface treatment which may result in secondary contamination and damage to the film. Despite its simplicity the process provides a high reproducibility in emission current density which makes the films suitable for practical applications. |
| Keywords: | Carbon nanotubes Surface treatment Heat treatment Field-emission |
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