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http://dx.doi.org/10.4313/JKEM.2008.21.5.402

Preparation of Bucky Paper using Single-walled Carbon Nanotubes Purified through Surface Functionalization and Investigation of Their Field Emission Characteristics  

Goak, Jeung-Choon (세종대학교 나노공학과)
Lee, Seung-Hwan (세종대학교 나노공학과)
Lee, Han-Sung (세종대학교 나노공학과)
Lee, Nae-Sung (세종대학교 나노공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.21, no.5, 2008 , pp. 402-410 More about this Journal
Abstract
Single-walled carbon nanotubes (SWCNTs) were currently produced together with some contaminants such as a metallic catalyst, amorphous carbon, and graphitic nanoparticles, which should be sometimes purified for their applications. This study aimed to develop efficient, scalable purification processes but less harmful to SWCNTs. We designed three-step purification processes: acidic treatment, surface functionalization and soxhlet extraction, and heat treatment. During the soxhlet extraction using tetrahydrofuran, specifically, carbon impurities could be easily expelled through a glass thimble filter without any significant loss of CNTs. Finally, SWCNTs were left as a bulky paper on the filter through membrane filtration. Vertically aligned SWCNTs on one side of bulky paper were well developed in a speparation from the filter paper, which were formed by being sucked through the filter pores during the pressurized filtration. The bucky paper showed a very high peak current density of field emission up to $200\;mA/cm^2$ and uniform field emission images on phosphor, which seems very promising to be applied to vacuum microelectronics such as microwave power amplifiers and x-ray sources.
Keywords
Single-walled carbon nanotube; Arc discharge; Purification; Bucky paper; Field emission;
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