Aligned carbon nanotubes catalytically grown on iron-based nanoparticles obtained by laser-induced CVD

作者：Le Normand F^*; Cojocaru C S; Ersen O; Legagneux P; Gangloff L; Fleaca C; Alexandrescu R; Dumitrache F; Morjan I

来源：Applied Surface Science, 2007, 254(4): 1058-1066.

DOI：10.1016/j.apsusc.2007.08.054

• CVD
• plasma-enhanced CVD
• laser-induced pyrolysis
• iron particles
• carbon nanotubes
• electron field emission

Iron-based nanoparticles are prepared by a laser-induced chemical vapor deposition (CVD) process. They are characterized as body-centered Fe and Fe2O3 (maghemite/magnetite) particles with sizes <= 5 and 10 nm, respectively. The Fe particles are embedded in a protective carbon matrix. Both kind of particles are dispersed by spin-coating on SiO2/Si(1 0 0) flat substrates. They are used as catalyst to grow carbon nanotubes by a plasma- and filaments-assisted catalytic CVD process (PE-HF-CCVD). Vertically oriented and thin carbon nanotubes (CNTs) were grown with few differences between the two samples, except the diameter in relation to the initial size of the iron particles, and the density. The electron field emission of these samples exhibit quite interesting behavior with a low turn-on voltage at around 1 V/mu m.

• 出版日期2007-12-15