Langmuir-Blodgett films of heteropolyoxometalate/organomercury acetylide hybrid composites: Characterization and photoelectric properties

Li Liu*, Wei He Ai, Ming Jian Li, Shi Zhong Liu, Chun Mei Zhang, Hong Xia Yan, Zu Liang Du, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

A new family of organometallic/inorganic nanohybrid Langmuir-Blodgett (LB) films consisting of rigid-rod organomercury acetylide complex (OMA-C 16 or OMA-C8) as the π-conjugated organometallic molecule, tungsto(molybdo)phosphoric heteropolyacids HPA (HPA = H 3PMo12O40, H3PW12O 40, H6P2:-Mo18O62, or H6As2W18O62) of the Keggin and Dawson structures as the inorganic component, and octadecylamine (ODA) as the auxiliary film-forming agent were prepared and characterized by π-A isotherms, UV-vis absorption spectra, fluorescence spectra, atomic force microscopy imaging, scanning tunneling microscopy, surface photovoltage spectroscopy, and low-angle X-ray diffraction. Our experimental results indicate that steady, even, and ordered Langmuir and LB films are formed in pure water and heteropolyacid subphase. They typically have a highly organized lamellar structure in which a monolayer of HPA is arranged alternately with well-ordered layers of OMA (and also ODA for OMA-C16) and the periodicity of the layered structure for the OMA-C16/ODA/H3PMo 12O40 LB film is ca. 3.7 nm. Luminescence spectra of hybrid LB films show that HPA can quench the emission of OMA-C16 and OMA-C8 to some extent. These LB composites show good photovoltage responses and a photovoltage of 103 μV can be obtained for the OMA-C 16/ODA/H3PMo12O40 system when it is excited by light at 330 nm. The monolayer LB films on silica wafer can also display interesting electrical conductivity behavior.

Original languageEnglish
Pages (from-to)1704-1711
Number of pages8
JournalChemistry of Materials
Volume19
Issue number7
DOIs
Publication statusPublished - 3 Apr 2007

Scopus Subject Areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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