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 extre...
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| Veröffentlicht in: | Nano letters 2007-07, Vol.7 (7), p.2073-2079 |
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| container_end_page | 2079 |
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| container_issue | 7 |
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| container_title | Nano letters |
| container_volume | 7 |
| creator | Jin, Zhong Chu, Haibin Wang, Jinyong Hong, Jinxing Tan, Wenchang Li, Yan |
| description | 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. |
| doi_str_mv | 10.1021/nl070980m |
| format | Article |
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| ispartof | Nano letters, 2007-07, Vol.7 (7), p.2073-2079 |
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| language | eng |
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| source | ACS Publications; MEDLINE |
| subjects | Cross-disciplinary physics: materials science rheology Exact sciences and technology Materials science Methods of nanofabrication Nanoscale materials and structures: fabrication and characterization Nanotechnology Nanotubes Nanotubes, Carbon Physics |
| title | Ultralow Feeding Gas Flow Guiding Growth of Large-Scale Horizontally Aligned Single-Walled Carbon Nanotube Arrays |
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