Abstract
AbstractThe 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 transition, low‐ and high‐frequency of the 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.
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