Synthesis and enhanced field-emission of thin-walled, open-ended, and well-aligned N-doped carbon nanotubes
| Autor: | Feiyu Kang, Tongxiang Cui, Dehai Wu, Jialin Gu, Kunlin Wang, Ruitao Lv, Qiang Hu |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Carbon nanotubes Nanochemistry Nanotechnology Thin walled Carbon nanotube law.invention Field emission chemistry.chemical_compound Materials Science(all) law lcsh:TA401-492 General Materials Science Thin-walled open-ended and aligned Acetonitrile Quartz Chemistry/Food Science general Free-standing Nano Express Material Science Doped carbon Engineering General Bamboo-shaped carbon nanotubes Materials Science general Condensed Matter Physics Field electron emission Physics General chemistry Chemical engineering Thin-walled index Molecular Medicine lcsh:Materials of engineering and construction. Mechanics of materials Order of magnitude |
| Zdroj: | Nanoscale Research Letters Nanoscale Research Letters, Vol 5, Iss 6, Pp 941-948 (2010) |
| ISSN: | 1556-276X |
| Popis: | Thin-walled, open-ended, and well-aligned N-doped carbon nanotubes (CNTs) on the quartz slides were synthesized by using acetonitrile as carbon sources. As-obtained products possess large thin-walled index (TWI, defined as the ratio of inner diameter and wall thickness of a CNT). The effect of temperature on the growth of CNTs using acetonitrile as the carbon source was also investigated. It is found that the diameter, the TWI of CNTs increase and the Fe encapsulation in CNTs decreases as the growth temperature rises in the range of 780–860°C. When the growth temperature is kept at 860°C, CNTs with TWI = 6.2 can be obtained. It was found that the filed-emission properties became better as CNT growth temperatures increased from 780 to 860°C. The lowest turn-on and threshold field was 0.27 and 0.49 V/μm, respectively. And the best field-enhancement factors reached 1.09 × 105, which is significantly improved about an order of magnitude compared with previous reports. In this study, about 30 × 50 mm2 free-standing film of thin-walled open-ended well-aligned N-doped carbon nanotubes was also prepared. The free-standing film can be transferred easily to other substrates, which would promote their applications in different fields. |
| Databáze: | OpenAIRE |
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