Multivalent cationic molecular and macromolecular adsorbates with plural pyridinium groups were adsorbed irreversibly on a substrate surface taking a negative charge, giving their single-layered adsorption film showing high desorption resistance toward deionized water. The desorption resistance of the adsorbates toward aqueous electrolyte solutions could be controlled by photochemical means such as photodimerization and photodegradation. The desorption suppression and promotion by the photochemical means was due to increasing and decreasing the number of cationic adsorption sites per molecule, respectively. Positive- and negative-type micropatterning, consisting of the surface adsorption, the imagewise exposure, and the development, could be carried out on the basis of the desorption promotion and suppression. The photopatterned adsorption films were available as templates for selective microsphere adsorption and metallization by electroless deposition. In this review, the recent studies done by the author and coworkers were described.
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