Ultralow feeding gas flow guiding growth of large-scale horizontally aligned single-walled carbon nanotube arrays.
On the basis of the rational analysis about the fluidic property of the system, an ultralow gas flow chemical vapor deposition (CVD) strategy was designed to prepare large-scale horizontally aligned ultralong single-walled carbon nanotube (SWNT) arrays. SWNT arrays could be well obtained under extremely low feeding flow of 1.5 sccm in a 1 in. quartz tube reactor. It was confirmed that the tubes grew floatingly and could cross microtrenches or climb over micro-obstacles in ultraslow gas flow. SWNTs arrays also could be formed no matter the substrate was placed vertically or upside down. The growth mechanism was discussed. Both the buoyancy effect induced by gas temperature/density difference and gas flow stability played dominant roles. More attractively, simultaneous batch-scale preparation of SWNT arrays was realized by the ultralow gas flow strategy. This new strategy turns to be more abstemious, efficient, promising, and flexible compared with the high gas flow rate fast-heating CVD processes.
Jin
Zhong
Z
Beijing National Laboratory for Molecular Sciences, Key Laboratory for the Physics, College of Chemistry and Molecular Engineering, LTCS Department of Mechanics and Aerospace Engineering, College of Engineering, Peking University, Beijing, China.
Chu
Haibin
H
Wang
Jinyong
J
Hong
Jinxing
J
Tan
Wenchang
W
Li
Yan
Y
D036103:Nanotechnology; D037742:Nanotubes, Carbon
D037742:Nanotubes, Carbon