Effect of acetylene concentration and thermal ramping rate on the growth of spin-capable carbon nanotube forests

Abstract

Articles you may be interested inEffect of different carrier gases and their flow rates on the growth of carbon nanotubes Phys. Plasmas 22, 043501 (2015); 10.1063/1.4916057 Growth of high-density carbon nanotube forests on conductive TiSiN supports Appl. Phys. Lett. 106, 083108 (2015); 10.1063/1.4913762Effect of hydrogen pretreatment on the spin-capability of a multiwalled carbon nanotube forest Spin-capable multiwalled carbon nanotube (MWCNT) forests that can form webs, sheets, and yarns provide a promising means for advancing various technologies. It is necessary to understand the critical factors to grow spin-capable carbon nanotubes (CNTs) in a repeatable fashion. Here we show how both the spinning capability and morphology of MWCNT forests are significantly changed by controlling the C 2 H 2 concentration and ramp rate of temperature. The acetylene gas flow was varied in the range of 0.25-6.94% by volume. The MWCNTs grown at C 2 H 2 concentrations between 1.47-3.37% are well-aligned and become spin-capable. The well-aligned forests have higher areal density and shorter distance between CNTs. The thermal ramp rate was also changed from 30 C/min to 70 C/min. A specific range of thermal ramp rate is also required to have the suitably sized nanoparticles with sufficient density resulting in higher CNT areal density for spinnable MWCNTs. A ramp rate of 50 C/min forms suitable sized nanoparticles with sufficient density to produce CNT forests with a higher areal density and a shorter tube spacing.

A low-temperature operated in situ synthesis of TiC-modified carbon nanotubes with enhanced thermal stability and electrochemical properties

“…First, the CO gas released by the reaction of TiO 2 /Ti n O 2 n −1 and carbon sources increases the roughness of the CNT walls, and results in porous structures of the TiC/TiO@CNT nanomaterials. 27 The other reason is attributed to the high heating rate, 32,33 which results in a lower melting temperature of TiO 2 /TiC when compared with the reaction temperature, causing the formation of nanoparticles. In addition, the SEM images shown in Fig.…”

Flexible transparent conductive heater using multiwalled carbon nanotube sheet

“…[27][28][29] Our group produced transparent, conducting MWCNT sheets by simply spinning MWCNTs. [27][28][29] Our group produced transparent, conducting MWCNT sheets by simply spinning MWCNTs.…”

Effect of hydrogen pretreatment on the spin-capability of a multiwalled carbon nanotube forest

“…[25][26][27] These fabricated sheets and yarns are currently a very advanced technology in CNT science. [25][26][27] These fabricated sheets and yarns are currently a very advanced technology in CNT science.…”