Abstract
Single-walled carbon nanotubes (SWCNTs) were incorporated with poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) in dimethyl sulfoxide (DMSO) solvent for preparing flexible transparent conducting films on polyethylene terephthalate substrate by using the spray coating method. The best SWCNT-PEDOT/PSS-DMSO film showed high performance with a low sheet resistance of 118Ω/sq and a high transmittance of 90.5%. The conducting mechanism of SWCNT-PEDOT/PSS-DMSO films was investigated by using both atomic force microscopy and Raman spectroscopy, and the improved performance was attributed to the following: (1) the uniform transparency of SWCNTs across the whole visible light spectrum overcame the undesirable transmittance of PEDOT/PSS films, (2) the conducting SWCNTs instead of insulating excess PSS provided the bridges between the conductive PEDOT/PSS grains, (3) the conductive PEDOT/PSS materials between SWCNT networks reduced the contact resistance between SWCNTs, and (4) the electronic interaction between SWCNTs and PEDOT increased the electronic mobility of the whole films.
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