Abstract
This research investigated the Raman spectra on 3-D functional single-walled carbon nanotubes (SWCNTs) which were deposited on polycarbonate (PC) with dip-coating as flexible transparent-conducting film for fast and large area deposition. The pre-acidification was done by using of sulfuric acid to form the 3-D carboxylic acid (COOH) functionalization on the SWCNTs collected by vacuum filtration. The analysis of Raman spectra could explicate the pre-purity saturation of sulfuric by the area ratios of G/D. Simultaneously the G+ peak appeared the blue shift with the acid functionalization inside SWCNTs and G− peak suggested the good dispersion of SWCNTs by its vibration along the circumferential direction, so the area ratio of the G+/G− could explain the dispersion level of the acid-functional SWCNTs. However, the best pre-acid temperature and time were 120 °C and 24 h, respectively, and the sheet resistance of SWCNTs/PC flexible film could be <500 Ω/sq at transmittance above 70%.
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