Modification of conductive polymer PEDOT:PSS layer by SWCNT

Abstract

Abstract. In this study, the effect of addition of single-walled carbon nanotubes (SWCNTs) on the morphological properties of poly(3,4-ethylenedioxythiophene/poly(4-styrenesulfonate) (PEDOT:PSS) has been investigated using scanning electron microscope (SEM) as well as the surface roughness evaluation by atomic force microscopy (AFM). The spin-coated films of PEDOT:PSS and PEDOT:PSS with addition of SWNTs (0.5 % by wt.) on glass were compared in our study. Experimental results show that surface roughness of PEDOT:PSS layers increases after addition SWNTs to the solution -from 3.50 nm for the samples without SWNTs to 4.65 nm for the samples with SWNTs. The analysis of SEM images showed that there are some agglomerations of SWNTs on the surface of PEDOT:PSS/SWCNT composite film.

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“…The obvious separation provided a larger region for continuous carrier mobility without the carriers having to hop very frequently over the insulating PSS chains, leading to the superior conductivity of PEDOT:PSS-ET ( v / v , 1:0.5) film [ 48 ]. The clearer surface morphology was exhibited in the 3D AFM images [ 49 ].…”

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“…This was not observed for similar CVs ran with uncoated GC (data not shown). This could be explained by the roughness (in the order of 1–10 nm) of the PEDOT surface. Fractal roughness, in contrast with a regular, patterned roughness, was found experimentally and theoretically to induce peak separation below the limit generally attributed to reversible redox reaction .…”