Carbon nanofiber bundles grown by plasma enhanced chemical vapor deposition
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A bundle of carbon nanofibers (CNFs) was successfully obtained on a glass substrate through a plasma enhanced chemical vapor deposition (PECVD) process. CNFs having dimensions of 100 nm in diameter and 1 μm in length nucleated on the Ni- Cr catalysis and grew selectively in a circular area 3 μm in diameter with a number density of 50 in 1 μm2. PECVD was used with mixed source gases of CH4/H2/He and a substrate temperature of less than 743 K which was lower than the transition temperature of glass substrate. Each CNF had a nanostructure of a stacked cup-cone shaped graphite shells with a Ni-Cr nanoparticle surmounted at the top. The field emission characteristics of the CNF bundle were also evaluated up to 3 μA at 130 V and the maximum in the current-voltage relation was converted to a Fowler-Nordheim (F-N) plot using a work function value of 5.0 eV for CNF which showed an explicit linear F-N relation. This means a CNF bundle is a candidate element for two dimensional field emitter devices.
Abstract
A bundle of carbon nanofibers (CNFs) was successfully obtained on a glass substrate through a plasma enhanced chemical vapor deposition (PECVD) process. CNFs having dimensions of 100 nm in diameter and 1 μm in length nucleated on the Ni- Cr catalysis and grew selectively in a circular area 3 μm in diameter with a number density of 50 in 1 μm2. PECVD was used with mixed source gases of CH4/H2/He and a substrate temperature of less than 743 K which was lower than the transition temperature of glass substrate. Each CNF had a nanostructure of a stacked cup-cone shaped graphite shells with a Ni-Cr nanoparticle surmounted at the top. The field emission characteristics of the CNF bundle were also evaluated up to 3 μA at 130 V and the maximum in the current-voltage relation was converted to a Fowler-Nordheim (F-N) plot using a work function value of 5.0 eV for CNF which showed an explicit linear F-N relation. This means a CNF bundle is a candidate element for two dimensional field emitter devices.
참고문헌 (12)
- S. Iijima, , Nature, 354, pp.56~58 (1991)
- . C. Joumet, , Nature, 75, pp.756~758 (1997)
- S. Fan, , Science, 283, pp.512~514 (1999)
- S.H. Tsai, , Appl. Phys. Lett, 74, pp.3462~3464 (1999)
- V. Ivanov, , Carbon, 33, pp.1727~1738 (1995)
- K. Hernadi, , Appl. Catal, 199, pp.245~255 (2000)
- P. Chen, , Carbon, 35, pp.1495~1501 (1997)
- C. Park, , J. Catal, 221, pp.386~399 (2004)
- S. Takenaka, , J. Phys. Chem. B, 108, pp.11464~11472 (2004)
- M. Yudasaka, , Carbon, 35, pp.195~201 (1997)
- G.L. Bezemer, , Stud. Surf. Sci. Catal, 147, pp.259~264 (2004)
- C.J. Liu, , Carbon, 42(12-13), pp.2635~2640 (2004)