Molecular Orientation and Fluorescence Studies on Naphthalene Acetate Intercalated Zn2Al Layered Double Hydroxide

Abstract

This paper describes a systematic study on molecular orientation and fluorescence properties for the Zn2Al layered double hydroxide (LDH) intercalated with α-naphthalene acetate (α-NAA) and β-naphthalene acetate (β-NAA), respectively. α-NAA and β-NAA intercalated Zn2Al LDH (denoted as α-NAA LDH and β-NAA LDH) were prepared by the ion-exchange method and their thin films on Si substrates were obtained by the solvent evaporation method. The powder X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) of α-NAA LDH and β-NAA LDH confirm the intercalation of guests between sheets of LDH. The XRD and scanning electron microscope (SEM) images of α-NAA LDH and β-NAA LDH thin films show that they are well c-oriented assembly with platelet-like morphology. UV−vis absorption and fluorescence spectra (emission, lifetime, and time resolution) indicate that the intercalated NAA is accommodated in its monomer form and depolarization factors exhibit no influence on its fluorescence emission process,...