In this work, we present the first demonstration of tuning the work function of polyaniline by controlling
the concentration level of camphorsulfonic acid as a protonic acid dopant and m-cresol as a solvent.
Optical, thermal, structural, and electronic properties, along with surface topography and elemental
analysis of protonated polyaniline, were studied in detail to investigate the effect of camphorsulfonic
acid on the work function of polyaniline. The results showed that an increase in camphorsulfonic acid
content induces a gradual transformation in the polyaniline structure from an emeraldine base to an
emeraldine salt phase, which is associated with an increase in electrical conductivity and an
improvement in crystallinity. X-ray photoelectron spectroscopy was used to evaluate the work
function and to determine the elemental composition of the surface and several atomic layers
beneath the surface. The results showed that increasing the camphorsulfonic acid content from
quarter protonated to fully protonated leads to an increase in the work function of polyaniline from
4.42 0.14 eV to 4.78 0.13 eV.
عمر عبدالستار عبدالرزاق | Omar A. Abdulrazzaq | 2999