Photochromic inorganic-organic multilayer films based on polyoxometalates and poly(ethylenimine).

Journal Article (Journal Article)

Novel photochromic inorganic-organic multilayers composed of polyoxometalates and poly(ethylenimine) have been prepared by the layer-by-layer (LbL) self-assembly method. The growth process, composition, surface topography, and photochromic properties of the multilayer films were investigated by UV-visible and Fourier transform infrared spectroscopy, atomic force microscopy, electrospin resonance (ESR), and X-ray photoelectron spectroscopy (XPS). Irradiated with ultraviolet light, the transparent films changed from colorless to blue. Moreover, the blue films showed good reversibility of photochromism and could recover the colorless state gradually in air, where oxygen plays an important role in the bleaching process. On account of the ESR and XPS results, parts of W6+ in multilayers were reduced to W5+, which exhibited a characteristic blue; a possible photochromic mechanism can be speculated. This work provides basic guideline for the assembly of multilayers with photochromic properties.

Full Text

Duke Authors

Cited Authors

  • Jiang, M; Wang, E; Wei, G; Xu, L; Li, Z

Published Date

  • July 15, 2004

Published In

Volume / Issue

  • 275 / 2

Start / End Page

  • 596 - 600

PubMed ID

  • 15178292

International Standard Serial Number (ISSN)

  • 0021-9797

Digital Object Identifier (DOI)

  • 10.1016/j.jcis.2004.02.072

Language

  • eng

Conference Location

  • United States