Photoluminescent multilayer films based on polyoxometalatesXRR spectrum of {(PEI/PSS/PAH)(EuP5W30/PAH)6}, UV-Vis spectrum of EuP5W30 anion and AFM image of the top layer of (PEI/PSS/PAH). See http://www.rsc.org/suppdata/jm/b1/b108283c/
2002; Royal Society of Chemistry; Volume: 12; Issue: 3 Linguagem: Inglês
10.1039/b108283c
ISSN1364-5501
AutoresLin Xu, Hongyu Zhang, Enbo Wang, Dirk G. Kurth, Zhuang Li,
Tópico(s)Nanocluster Synthesis and Applications
ResumoUltrathin multilayer films consisting of the polyoxotungstoeuropate cluster K12[EuP5W30O110] (EuP5W30) and poly(allylamine hydrochloride) (PAH) have been prepared by the layer-by-layer self-assembly method. The (EuP5W30/PAH) multilayer films have been characterized by small-angle X-ray reflectivity measurements, X-ray photoelectron spectra, and atomic force microscopy (AFM). From the AFM images, the thickness of the {PEI/PSS/PAH(EuW30/PAH)} multilayer film was estimated to be 6.5 nm, corresponding to an average thickness of ca.1.1 nm for a EuW30/PAH layer pair. The photoluminescent behavior of the film at room temperature was investigated to show the characteristic Eu3+ emission pattern of 5D0 → 7FJ. The fluorescence behavior of the multilayer film is essentially identical to that of Hn[EuP5W30O110](12 − n)− in a concentrated aqueous solution, except for the relative intensities and peak bandwidths. The occurence of photoluminescent activity confirms the potential for creating luminescent multilayers with polyoxometalates (see ).
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