TY - JOUR
T1 - Effect of methanol addition on the resistivity and morphology of PEDOT:PSS layers on top of carbon nanotubes for use as flexible electrodes
AU - Wang, Weijia
AU - Ruderer, Matthias A.
AU - Metwalli, Ezzeldin
AU - Guo, Shuai
AU - Herzig, Eva M.
AU - Perlich, Jan
AU - Müller-Buschbaum, Peter
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/4/29
Y1 - 2015/4/29
N2 - Overcoating carbon nanotube (CNT) films on flexible poly(ethylene terephthalate) (PET) foils with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layers reduces the surface roughness, which is interesting for use in organic electronics. Adding methanol to the PEDOT:PSS aqueous solution used for spin coating of the PEDOT:PSS layer improves the wetting behavior of the CNT/PET surface. Samples with different volume fractions of methanol (0, 33, 50, 67, and 75 vol %) are compared with respect to the transmission, horizontal, and vertical resistivity. With grazing-incidence small-angle X-ray scattering, the film morphologies are probed, which is challenging because of the substrate flexibility. At 50 vol %, methanol optimum conditions are achieved with the resistivity close to that of the bare CNT/PET substrates because of the best contact between the PEDOT:PSS film and CNT surface. At lower methanol ratios, the PEDOT:PSS films cannot adapt the CNT morphology, and at higher methanol ratios, they rupture into domains and no continuous PEDOT:PSS layers are formed.
AB - Overcoating carbon nanotube (CNT) films on flexible poly(ethylene terephthalate) (PET) foils with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layers reduces the surface roughness, which is interesting for use in organic electronics. Adding methanol to the PEDOT:PSS aqueous solution used for spin coating of the PEDOT:PSS layer improves the wetting behavior of the CNT/PET surface. Samples with different volume fractions of methanol (0, 33, 50, 67, and 75 vol %) are compared with respect to the transmission, horizontal, and vertical resistivity. With grazing-incidence small-angle X-ray scattering, the film morphologies are probed, which is challenging because of the substrate flexibility. At 50 vol %, methanol optimum conditions are achieved with the resistivity close to that of the bare CNT/PET substrates because of the best contact between the PEDOT:PSS film and CNT surface. At lower methanol ratios, the PEDOT:PSS films cannot adapt the CNT morphology, and at higher methanol ratios, they rupture into domains and no continuous PEDOT:PSS layers are formed.
KW - GISAXS
KW - PEDOT:PSS
KW - flexible electrodes
KW - morphology
KW - resistivity
UR - http://www.scopus.com/inward/record.url?scp=84928775389&partnerID=8YFLogxK
U2 - 10.1021/acsami.5b01327
DO - 10.1021/acsami.5b01327
M3 - Article
AN - SCOPUS:84928775389
SN - 1944-8244
VL - 7
SP - 8789
EP - 8797
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 16
ER -