Tuning the optoelectronic properties of P3EHT block copolymers by surface modification

Lisa T. Strover, Bryan McCulloch, Victor Ho, Rachel Segalman, Jenny Malmström, Duncan J. McGillivray, Jadranka Travas-Sejdic

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

P3AT-containing block copolymers (BCPs) have potential for use as electroactive polymer brushes for stimuli-responsive surfaces, with reversible tethering of the P3AT block. This kind of tethering is highly dependent on the P3AT block's affinity for the surface. We have investigated the effect of surface modification on P3EHT-b-PS and P3EHT-b-PtBA films deposited on ITO-coated glass substrates modified by electrodeposition of poly(terthiophene). Optical and electrochemical properties of the BCPs deposited both on PTTh films and on bare ITO were investigated by UV-Vis spectroscopy and cyclic voltammetry, respectively. These characterisations reveal interplay between deposition conditions and the optoelectronic behaviour of BCPs investigated, and also provide insight as to their morphology under various conditions as it impacts on such behaviour. Significantly, electrochemically-driven switches in the morphology of BCPs were observed, however polymer-solvent interactions dominated. Absorbance spectra revealed a strong interaction between BCPs and the poly(terthiophene) substrates, manifesting as disruptions in crystallinity in the BCPs.

Original languageEnglish
Pages (from-to)540-557
Number of pages18
JournalInternational Journal of Nanotechnology
Volume14
Issue number1-6
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

Keywords

  • Conducting polymers
  • Cyclic voltammetry
  • Optoelectronic properties
  • P3ATs
  • Poly(thiophenes)
  • Polymer brushes
  • Rod-coil block copolymers
  • Self-assembly
  • Stimuli-responsive surfaces
  • Surface chemistry
  • Thin films

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