Enhanced and stable electron emission of carbon nanotube emitter arrays by post-growth hydrofluoric acid treatment |
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| Authors: | Ki Seo Kim Je Hwang Ryu Chang Seok Lee Jin Jang and Kyu Chang Park |
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| Affiliation: | (1) Department of Physics and Advanced Display Research Center, Kyung Hee University, Seoul, 130-701, South Korea;(2) Department of Information Display and Advanced Display Research Center, Kyung Hee University, Seoul, 130-701, South Korea; |
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| Abstract: | Carbon nanotubes (CNT) have been highlighted as possible candidates for field-emission emitters and vacuum nanoelectronic
devices. In this article, we studied the effect of acid treatment of CNTs on field emission from carbon nanotube field emitter
arrays (FEAs), grown using the resist-assisted patterning process (RAP). The emission current densities of as grown CNT-FEAs
and those which were later immersed in hydrofluoric acid (HF) for 20 s, were 19 μA/cm2 and 7.0 mA/cm2, respectively, when measured at an anode field of 9.2 V/μm. Hence, the emission current densities after HF treatment are
300 times larger than those of as grown CNT-FEAs. Also, it was observed that a very stable electron emission current was obtained
after stressing the CNTs with an electric field of 9.2 V/μm for 800 min in dc-mode, where the emission current non-uniformity
was 0.13%. The enhancement in electron emission after HF treatment appears to be due to the effect of fluorine bonding. Also,
the electron emission characteristics and structural improvement of CNT-FEAs after HF treatment are discussed. |
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