Arc synthesis of double-walled carbon nanotubes in low pressure air and their superior field emission properties |
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| Affiliation: | 1. School of Advanced Device Engineering, University of Science & Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 305-350, Republic of Korea;2. Nano Electron-Source Creative Research Center, Electronics and Telecommunications Research Institute, 218 Gajeong-ro, Yuseong-gu, Daejeon 305-700, Republic of Korea;3. Department of Information Display, Sun Moon University, Kalsan-ri, Tangjeong-myoon, Asan-si, Chungnam 336-708, Republic of Korea;1. Department of Mechanical & Aerospace Engineering, The George Washington University, Washington DC 20052, USA;2. School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907, USA;1. Institute of Carbon Science and Technology & Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan;2. Alan G. MacDiarmid Energy Research Institute, School of Polymer Science and Engineering & Department of Polymer Engineering, Graduate School, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-7257, Republic of Korea;3. Biohousing Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-7257, Republic of Korea;4. Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeonbuk 565-905, Republic of Korea;5. Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA;6. Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA;7. Department of Materials Science & Engineering, The Pennsylvania State University, University Park, PA 16802, USA;8. Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA;9. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA;10. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA |
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| Abstract: | Double-walled carbon nanotubes (DWCNTs) have been effectively synthesized by direct current (DC) arc discharge in low pressure air using a mixture of Fe catalyst and FeS promoter. Compared with conventional arc methods, this method is easier to implement without using expensive high purity gas sources. A tip structural DWCNT film has been successfully fabricated by a mixing process of electrophoresis, electroplating and electrocorrosion. The field emission properties of tip structural nanotube film are significantly increased compared with DWCNT film fabricated by electrophoresis. The turn-on electric field Eto decreases from 1.25 to 0.92 V/μm, the low threshold electric field Eth decreases from 1.45 to 1.13 V/μm, and the field enhancement factor β increases from about 2210 to 4450. Meanwhile, this tip structural CNT film shows remarkably stable within 2% fluctuations for several hours. The high-performance emitter material and preparation technologies are both easy to scale up to large areas. |
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