Abstract
The long-term stability of multiwall carbon nanotubes (MWCNTs) mixed with the
hole-transport polymer Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has
been examined. These surfactant stabilized solutions, used as transport layers in organic
light-emitting diodes (OLEDs), are shown to be stable for periods of up to 15 months and show no
signs of degrading soon after this time. In comparison, nonstabilized aqueous MWCNT solutions have
been shown to aggregate within 30 min of production, and, although these aggregates can be
redispersed, the solution displays an increase in smaller aggregates over time which cannot
subsequently be redispersed by manual agitation. The stable MWCNT/PEDOT:PSS solutions have been
used in ink-jet printing and as composite MWCNT/PEDOT:PSS films suitable as charge transport
layers in spin-coated OLEDs.
© 2013 IEEE
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