Preparation, characterization, and electrical properties of dual-emissive langmuir-blodgett films of some europium-substituted polyoxometalates and a platinum polyyne polymer

Li Liu*, Ming Chen, Jun Yang, Shi Zhong Liu, Zu Liang Du, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

A new series of organometallic/inorganic composite Langmuir-Blodgett (LB) films consisting of a rigid-rod polyplatinyne polymer coordinated with 2,7-bis(buta-1,3-diynyl)-9,9-dihex- ylfluorene (denoted as PtP) as the π-conjugated organometallic molecule, an europium-substituted polyoxometalate (POM; POM = Na9EuW10O36,K 13[Eu(SiW11O39)2]and K 5EuSiW11H2O)2]) as the inorganic component, and an amphiphilic behenic acid (BA) as the auxiliary film-forming agent were prepared. Structural and photophysical characterization of these LB films were achieved by π-A isotherms, absorption and photoluminescence spectra, atomic force microscopy imaging, scanning tunneling microscopy, and low-angle X-ray diffraction. Our experimental results indicate that stable, well-defined, and well-organized Langmuir and LB films are formed in pure water and POM subphases, and the presence of Eu-based POM in the subphase causes an area expansion. It is proposed that a lamellar layered structure exists for the PtP/BA/POM LB film in which the POM and PtP molecules can lay down with the interfacial planes. Luminescence spectra of the prepared hybrid LB films show that nearwhite emission spectra can be obtained due to the dual-emissive nature of the mixed PtP/POM blends. These Pt-polyyne-based LB films displayed interesting electric conductivity behavior. Among them, PtP/BA/POM 13-layer films showed a good electrical response, with the tunneling current up to ±100 nA when the voltage was monitored between - 1and 7 V.

Original languageEnglish
Pages (from-to)879-888
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number4
DOIs
Publication statusPublished - 15 Feb 2010

Scopus Subject Areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

User-Defined Keywords

  • Fluorene
  • LB film
  • Luminescence
  • Metal polyynes
  • Metal-polymer complexes
  • Metallopolymers
  • Polyoxometalate
  • Synthesis
  • Thin films
  • Transition metal chemistry

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