Morphology and photophysical properties of polymer thin films dispersed with dye nanoparticle

Abstract

We prepared nanoparticles of an organic dye, acridine orange (AO), dispersed in poly(methacrylic acid) (PMA) films by spin-coating the solution of the two components. The surface of the AO/PMA films became bumpier with increasing AO concentration ( c AO). The absorption and fluorescence spectra of AO/PMA films exhibited a marked dependence on c AO at low c AO ( c AO < 2.1 × 10 − 1 mol kg − 1 ), and were independent of c AO at high c AO ( c AO > 2.1 × 10 − 1 mol kg − 1 ). The peak shift of fluorescence spectra with changing c AO was as large as ∼ 100 nm.