Conductive Polymers

Intrinsically conductive polymers like polyanilines, polypyrrols and polythiophenes become conductive by removing an electron from their conjugated π-orbitals via doping. The electrical conductivity results from the delocalization of electrons along the polymer backbone - hence the term “synthetic metals”. For three decades conductive polymers have been an area of intense research and in the year 2000 Alan Heeger, Alan MacDiarmid, and Hideki Shirakawa received the Nobel Prize in Chemistry “for the discovery and development of conductive polymers." Clevios™ PEDOT:PSS is a substituted polythiophene ionomer complex with a polyanion that offers the highest conductivity found so far in a commercial product : 1000 S/cm. The product is offered as the monomer for in-situ polymerisation, as neat water based dispersions or as ready-to-use formulations mixed with solvents and additives.

Clevios™ is a product family of monomers, catalysts (oxidizers), polymers and formulations thereof designed for the creation of thin electrically conductive polymer coatings. The basic chemistry of the polymerisation is shown in the scheme above.

  • Conductive polymer (up to 1000 S/cm)
  • Good chemical stability
  • Transparent (Y as high as 90% @ d = 100nm)
  • Easy to use polymer dispersion or in-situ polymerisation
  • Safe handling
  • Tailor made product range for specific applications
  • Good thermal/UV stability
  • Industrial scale product

Generally speaking, polymers are insulators. However there is a special class of polymers the “intrinsically conductive polymers” that have conductivity levels between those of semiconductors and metals (up to 100 - 1000 S/cm).

The combination of metallic and polymeric properties opens completely new opportunities in numerous applications, particularly in the electronics industry, which were previously not possible. The first generation of conductive polymers like polyacetylene or polypyrrole were not suitable for practical applications due to low long term stability of the conductivity and/or low processability.

With poly(3,4-ethylenedioxythiophene) or briefly named PEDT or PEDOT - available under the trade name Clevios™- Heraeus has developed the latest generation of conductive polymers which are characterized by outstanding properties.

  • High conductivity
  • High transparency
  • High stability
  • Easy processing
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