Directing polypyrrole growth by chemical micropatterns: A study of high-throughput well-ordered arrays of conductive 3D microrings

David Caballero, Laura Fumagalli, Francesc Teixidor, Josep Samitier, Abdelhamid Errachid

    Research output: Contribution to journalArticlepeer-review

    Abstract

    An array of well-ordered conducting polypyrrole microrings doped with cobaltabisdicarbollide [Co(C2B9H11) 2]- anions was fabricated by means of electropolymerization and submerged micro-contact printing techniques. The different conductive properties of the micropatterned thiols acted as a template for directing the electrochemical 3D growth of the microstructures over large areas. X-ray photoelectron spectroscopy characterization confirmed the presence of this unusual doping anion within the polymer. Its intrinsic properties together with hydrophobic interactions with the thiols guided the formation of the ring structures. A topographic study by atomic force microscopy gave insights into the PPy/[Co(C2B9H11) 2]- growing mechanism which is in agreement with the theoretical model of metal growth. Finally, the conductive properties of the microstructures were addressed by conductive-atomic force microscopy, showing a highly conductive behaviour. This methodology using cobaltabisdicarbollide as dopant anion could have important applications in organic microelectronics for the development of biosensors, in cell microarrays and for the fabrication of polymer-based microencapsulators.

    Original languageEnglish
    Pages (from-to)1003-1009
    Number of pages7
    JournalSensors and Actuators, B: Chemical
    Volume177
    DOIs
    Publication statusPublished - 12 Dec 2012

    Keywords

    • Conducting polymer
    • Doping anion
    • Growing mechanism
    • Micropatterning
    • Polypyrrole

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