DocumentCode :
3271334
Title :
Amorphous carbon assisted highly percentage synthesis of ultralong, well-aligned, and visible carbon nanotubes
Author :
Chang, N.K. ; Chuang, C.C. ; Su, C.C. ; Chang, S.-H.
Author_Institution :
Dept. of Mech. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fYear :
2005
fDate :
25-28 Oct. 2005
Firstpage :
196
Lastpage :
197
Abstract :
In this study, we present a method to observe the location and the length of carbon nanotubes under an optical system instead of SEM. Firstly, the carbon nanotubes were synthesized by using mixed methane and ethylene carbon source in the chemical vapor deposition (CVD) as reported in W. Kim et al. (2002). Then, the carbon nanotubes were coated with amorphous carbon by blowing ethanol vapor into the furnace at 900 °C. The observations of SEM and TEM show that each carbon fiber consists of one carbon nanotube and a great deal of amorphous carbon. The diameters of the carbon fibers, around 500 nm, are so large that they can be easily observed and estimated from the optical images. For example, the longest length of carbon fiber observed in this experiment can exceed 2 cm. In addition, the most of the carbon fibers are well-aligned due to floating catalyst as presented in S. Huang et al. (2003). This method is useful as locating of suspended carbon nanotubes or manipulating nanotubes under the optical system.
Keywords :
CVD coatings; carbon nanotubes; scanning electron microscopy; transmission electron microscopy; 900 C; amorphous carbon; carbon fiber; carbon nanotubes; chemical vapor deposition; floating catalyst; optical system; Amorphous materials; Carbon nanotubes; Chemical vapor deposition; Chemistry; Ethanol; Fluid flow; Mechanical engineering; Semiconductivity; Substrates;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microprocesses and Nanotechnology Conference, 2005 International
Print_ISBN :
4-9902472-2-1
Type :
conf
DOI :
10.1109/IMNC.2005.203805
Filename :
1595281
Link To Document :
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