Self-organized carbon nanotips

Jang, Jin; Chung, Suk Jae; Kim, Hong Sik; Lim, Sung Hoon; Lee, Choong Hun
September 2001
Applied Physics Letters;9/10/2001, Vol. 79 Issue 11
Academic Journal
We have developed a carbon nanostructure, which is comprised of high-density carbon nanotips on a graphite layer. These carbon nanotips, with tip diameters of ∼10 nm, are grown by high-density plasma chemical vapor deposition onto Ni-coated Si using an inductively coupled plasma. The Ni on Si changes into NiSi[sub 2] by substrate heating. First, a carbon buffer layer and then a graphene sheet are formed on the NiSi[sub 2]. Then, the carbon nanotips are grown by a C[sub 2]H[sub 2]/H[sub 2] plasma on the graphene sheet. The carbon nanotips show good adhesion to the substrate and are almost aligned, with an average length of 110 nm. They exhibit a turn-on field of 0.1 V/μm, a field amplification factor of ∼13 000, a current density of 2 mA/cm[sup 2] at a field of 2 V/μm, and uniform electron emission. © 2001 American Institute of Physics.


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