کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1669485 | 1008884 | 2011 | 5 صفحه PDF | دانلود رایگان |
We report the rapid synthesis of millimeter-long vertically-aligned carbon-nanotubes (VACNTs) by hot-filament chemical-vapor-deposition without the use of water vapor. The growth rate increased initially up to ~ 190 μm/min but decreased thereafter resulting in the growth of up to 2.2 ± 0.2 mm in 23 ± 2 min. A thermodynamic model driven by a carbon-concentration gradient can account for very rapid initial growth with Arrhenius-type exponential temperature dependence. Another model devised for the quantitative elucidation of the monotonic decrease in growth-rate and quasi saturation of VACNT growth confirmed that the growth kinetics of VACNTs are controlled by the concomitant contribution of a diffusion-limited precursor supply and reaction-driven catalyst deactivation.
Journal: Thin Solid Films - Volume 519, Issue 14, 2 May 2011, Pages 4432–4436