Abstract
A fully aromatic polyester (poly-p-phenyleneterephthalates) containing N-(4-nitrophenyl)-(L)-prolinol (Poly6-NPP) as a nonlinear optical (NLO) chromophore was synthesized and characterized in the monolayer domain. Surface pressure-area (II—A) isotherms and Brewster angle microscopy (BAM) indicated that pure Poly6-NPP formed a stable Langmuir film at the air-water interface. Although homogeneity and structural regularity of Langmuir films of Poly6-NPP were considerably improved by addition of PMMA, atomic force micrographs indicated that in the mixed Langmuir-Blodgett (LB) films segregated small islands were appeared with size of a few hundred nanometer. During the electrical poling process, surface-enhanced Raman scattering (SERS) spectra of the polymer LB films were simultaneously recorded to monitor conformational changes of NPP in the polymer matrix. SERS spectra indicated that NPP in the polymer structure underwent conformational changes from a disorganized random structure to an organized tilted orientation respect to Ag surface. This was consistent with the observation on the intensity variation of the second harmonic generation as well as on topographical images obtained by atomic force microscopy (AFM).
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