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- ItemE/Z reversible photoisomerization of methyl orange doped polyacrylic acid-based polyelectrolyte brush films(Hoboken, NJ [u.a.] : Wiley InterScience, 2022) Al‐Bataineh, Qais M.; Telfah, Ahmad D.; Ahmad, Ahmad A.; Bani‐Salameh, Areen A.; Abu‐Zurayk, Rund; Hergenröder, RolandThe photoswitching behavior of the polyacrylic acid (PAA) doped by methyl orange (MO) brush film was investigated using spectral analysis of UV-Vis absorbance, Fourier Transformation Infrared spectroscopy, 2D electrical conductivity mapping and Atomic Force Microscopy. The kinetics and time evolution of the photoisomerization of the PAA-MO PEBs film from E-state to Z-state by UV-light irradiation, and reverse thermal relaxation to E-state was explored. The results confirm that the photoisomerization kinetics of the overall peak is the superposition of the photoisomerization kinetics of (Formula presented.) transition, low- and high-frequency of the (Formula presented.) transition bands. The E–Z transformation led to transforming the azobenzene from flat with no dipole moment to 3.0 D dipole moment. Hence, the electrical conductivity escalated accordingly. The transformation of E-state to Z-state led to the collapse of the formed brushes because of the angular rotational momentum consequent to E–Z isomerization.