Optical and electrical investigations of poly(p-phenylene vinylene)/ silicon oxide and poly(p-phenylene vinylene)/titanium oxide nanocomposites

Sheng-Hsiung Yang, T. P. Nguyen*, P. Le Rendu, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

Composites made by incorporation of silicon oxide (SiO2) or titanium (TiO2) nanoparticles into poly(p-phenylene vinylene) (PPV) have been fabricated and their electrical and optical properties have been investigated. The UV-vis absorption and Raman spectra showed that SiO 2 nanoparticles reduced the conjugation lengths of PPV chains, while TiO2 nanoparticles did not. In the case of SiO2 nanoparticles, the reduction of conjugation length was more noticeable on increasing the oxide concentration or on decreasing the particle size. Fourier transform infrared (FT-IR) spectra showed that both types of nanoparticles also reduced the formation of carbonyl groups in PPV main chains. Current-voltage characteristics measured in the indium tin oxide (ITO)-composite-MgAg diodes exhibit different electrical behavior to the composites depending on the particle size and the nature of the used oxide. The composite-electrode contact morphology, the polymer-dielectric particle contact, and the change in the polymer chain length are the possible explanations for these changes in behavior of the diodes.

Original languageEnglish
Pages (from-to)230-235
Number of pages6
JournalThin Solid Films
Volume471
Issue number1-2
DOIs
StatePublished - 3 Jan 2005

Keywords

  • Conductivity
  • Electronic devices
  • Optical properties
  • Polymer

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