Three coating methods (slot, dip and blade coatings) were used separately to coat a well-dispersed single-wall carbonnanotube (SWCNT) solution on polyethylene terephthalate (PET) film, and the resulting optical and electronic properties were measured and compared. It was found that the sheet resistance and the transparency of the SWCNT coated film decreased as the coating speed increased for dip and blade coatings, but were independent of the coating speed for slot coating. All three coating methods were able to produce transparent conductive film with transparency above 85% and sheet resistance close to 1000 ohm/sq. For industrial production, the slot die coating methodappears to be more suitable in terms of high coating speed and uniformity of optical and electronic properties.
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K. Chen, H. Yeh, H. Chen, T. Liu, S. Huang, P. Wu and C. Tiu, "Optical-Electronic Properties of Carbon-Nanotubes Based Transparent Conducting Films," Advances in Chemical Engineering and Science, Vol. 3 No. 1, 2013, pp. 105-111. doi: 10.4236/aces.2013.31013.
 T. Minami, “New n-type Transparent Conducting Oxides,” Mrs Bulletin, Vol. 25, No. 8, 2000, pp. 38-44.
 U. Ozgur, Y. I. Alivov, C. Liu, A. Teke, M. A. Reshchikov, S. Dogan, V. Avrutin, S. J. Cho and H. Morkoc, “A Comprehensive Review of ZnO Materials and Devices,” Journal of Applied Physics, Vol. 98, No. 4, 2005, Article ID: 041301. doi:10.1063/1.1992666
 D. H. Zhang and H. L. Ma, “Scattering Mechanisms of Charge Carriers in Transparent Conducting Oxide Films,” Applied Physics A—Materials Science & Processing, Vol. 62, No. 5, 1996, pp. 487-492. doi:10.1007/BF01567122
 C. C. Wang, “Deposition of Transparent Conductive Film by Wet Process,” Industrial Material Magazine, Vol. 236, 2006, pp. 173-178.
 S. Ray, R. Banerjee, N. Basu, A. K. Batabyal and A. K. Barua, “Properties of Tin Doped Indium Oxide Thin-Films Prepared by Magnetron Sputtering,” Journal of Applied Physics, Vol. 54, No. 6, 1983, pp. 3497-3501.
 A. Kumar and C. W. Zhou, “The Race to Replace Tin-Doped Indium Oxide: Which Material Will Win?” ACS Nano, Vol. 4, No. 1, 2010, pp. 11-14.
 L. B. Hu, H. S. Kim, J. Y. Lee, P. Peumans and Y. Cui, “Scalable Coating and Properties of Transparent, Flexible, Silver Nanowire Electrodes,” ACS Nano, Vol. 4, No. 5, 2010, pp. 2955-2963. doi:10.1021/nn1005232
 M. Kaempgen, G. S. Duesberg and S. Roth, “Transparent Carbon Nanotube Coatings,” Applied Surface Science, Vol. 252, No. 2, 2005, pp. 425-429.
 O. Hjortstam, P. Isberg, S. Soderholm and H. Dai, “Can We Achieve Ultra-Low Resistivity in Carbon Nanotube-Based Metal Composites?” Applied Physics A: Materials Science & Processing, Vol. 78, No. 8, 2004, pp. 1175-1179. doi:10.1007/s00339-003-2424-x
 L. Hu, D. S. Hecht and G. Gruner, “Percolation in Transparent and Conducting Carbon Nanotube Networks,” Nano Letters, Vol. 4, No. 12, 2004, pp. 2513-2517.
 M. H. A. Ng, L.T. Hartadi, H. Tan and C. H. P. Poa, “Efficient Coating of Transparent and Conductive Carbon Nanotube Thin Films on Plastic Substrates,” Nanotechnology, Vol. 19, No. 20, 2008, pp. 205703-205707.
 S. De, T. M. Higgins, P. E. Lyons, E. M. Doherty, P. N. Nirmalraj, W. J. Blau, J. J. Boland and J. N. Coleman, “Silver Nanowire Networks as Flexible, Transparent, Conducting Films: Extremely High DC to Optical Conductivity Ratios,” ACS Nano, Vol. 3, No. 1, 2009, pp. 1767-1774. doi:10.1021/nn900348c
 M. C. Hersam, “Progress towards Monodisperse Single-Walled Carbon Nanotubes,” Nature Nanotechnology, Vol. 3, No. 7, 2008, pp. 387-394. doi:10.1038/nnano.2008.135
 M. S. P. Shaffer and K. Koziol, “Polystyrene Grafted Multi-Walled Carbon Nanotubes,” Chemical Communications, Vol. 18, 2002, pp. 2074-2075.
 C. Richard, F. Balavoine, P. Schultz, T. W. Ebbesen and C. Mioskowski, “Supramolecular Self-Assembly of Lipid Derivatives on Carbon Nanotubes,” Science, Vol. 300, No. 5620, 2003, pp. 775-778. doi:10.1126/science.1080848
 T. W. Ebbesen, H. J. Lezec, H. Hiura, J. W. Bennett, H. F. Ghaemi and T. Thio, “Electrical Conductivity of Individual Carbon Nanotubes,” Nature, Vol. 382, 1996, pp. 54-56. doi:10.1038/382054a0
 S. Kim, J. Yim, X. Wang, D. D. C. Bradley, S. Lee and J. C. Demello, “Spin- and Spray-Deposited Single-Walled Carbon-Nanotube Electrodes for Organic Solar Cells,” Advanced Functional Materials, Vol. 20, No. 14, 2010, pp. 2310-2316. doi:10.1002/adfm.200902369
 M. J. de Andrade, M. D. Lima, V. Skakalova, C. P. Bergmann and S. Roth, “Electrical Properties of Transparent Carbon Nanotube Networks Prepared through Different Techniques,” Physica Status Solidi-Rapid Research Letters, Vol. 1, No. 5, 2007, pp. 178-180.
 L. J. Ci, Y. H. Li, B. Q. Wei, J. Liang, C. L. Xu and D. H. Wu, “Preparation of Carbon Nanofibers by the Floating Catalyst Method,” Carbon, Vol. 38, No. 14, 2000, pp. 1933-1937. doi:10.1016/S0008-6223(00)00030-0
 J. M. Moon, K. H. An, Y. H. Lee, Y. S. Park, D. J. Bae and G. S. Park, “High-Yield Purification Process of Singlewalled Carbon Nanotubes,” The Journal of Physical Chemistry B, Vol. 105, No. 24, 2001, pp. 5677-5681.
 S. L. Kuo, S. J. Huang and C. M. Hu, “Transparent Conductive Film and Method for Manufacturing the Same,” Patent No. US20100040869-A1, 2010.
 T. M. Sullivan and S. Middleman, “Film Thickness in Blade Coating of Viscous and Viscoelastic Liquids,” Journal of Non-Newtonian Fluid Mechanics, Vol. 21, No. 1, 1986, pp. 13-38.
 H. T. Yang and P. Jiang, “Large-Scale Colloidal Self-Assembly by Doctor Blade Coating,” Langmuir, Vol. 26, No. 16, 2010, pp. 13173-13182. doi:10.1021/la101721v
 L. Landau and B. Levich, “Dragging of a Liquid by a Moving Plate,” Acta Physicochimica URSS, Vol. 17, No. 42, 1942, pp. 42-54.