Bottom-up electrochemical fabrication of conjugated ultrathin layers with tailored switchable properties

Verena Stockhausen, Van Quyen Nguyen, Pascal Martin, Jean Christophe Lacroix

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A bottom-up electrochemical process for fabricating conjugated ultrathin layers with tailored switchable properties is developed. Ultrathin layers of covalently grafted oligo(bisthienylbenzene) (oligo(BTB)) are used as switchable organic electrodes, and 3,4-ethylenedioxythiophene (EDOT) is oxidized on this layer. Adding only a few (less than 3) nanometers of EDOT moieties (5 to 6 units ) completely changes the switching properties of the layer without changing the surface concentration of the electroactive species. A range of new materials with tunable interfacial properties is created. They consist of oligo(BTB)-oligo(EDOT) diblock oligomers of various relative lengths covalently grafted onto the underlying electrode. These films retain reversible redox on/off switching and their switching potential can be finely tuned between +0.6 and -0.3 V/SCE while the overall thickness remains below 11 nm.

Original languageEnglish (US)
Pages (from-to)610-617
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number1
DOIs
StatePublished - 2017

Bibliographical note

Funding Information:
This work was supported by the CNRS, the University Paris Diderot (Paris, France) and by a Ph.D. grant from the University of Science and Technology of Hanoi and a Grant no. 15-CE09-0001-01 from Agence Nationale de la Recherche (ANR)

Keywords

  • Bottom-up approach
  • Diazonium grafting
  • Molecular electronics
  • Nanoelectrochemistry
  • Ultrathin film
  • π-conjugated material

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