Template synthesis of highly oriented polyfluorene nanotube arrays

Shane Moynihan, Daniela Iacopino, Deirdre M O'Carroll, Pierre Lovera, Gareth Redmond

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Polyfluorene nanotubes are synthesized by solution assisted wetting of porous anodic alumina membranes. Well aligned arrays of close packed (∼109 tubes/cm-2) discrete nanotubes are obtained. Individual tubes have diameters of ∼260 nm and wall thicknesses of ∼50 nm. X-ray diffraction measurements carried out on nanotube arrays embedded in host templates indicate a polymer chain alignment along the long axes of the template pores and, as a result, along the long axes of the nanotubes themselves. Optical spectroscopic studies of mats of nanotubes on glass substrates yield well resolved emission spectra reflecting a narrowed distribution of emitting chain segments with increased effective conjugation lengths. The data indicate intrachain reorientation of the amorphous random poly(9,9-dioctylfluorene-2,7-diy1) molecular conformation to the more planar (low energy) extended 21 helical β-phase conformation within the tubes. Raman spectra acquired for template embedded tubes are also consistent with β-phase formation. Finally, polarization resolved photoluminescence data demonstrate a pronounced axial orientation of the emissive β-phase chains within the tubes.

Original languageEnglish
Pages (from-to)996-1003
Number of pages8
JournalChemistry of Materials
Volume20
Issue number3
DOIs
Publication statusPublished - Feb 12 2008

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Nanotubes
Conformations
Aluminum Oxide
Wetting
Raman scattering
Photoluminescence
Polymers
Alumina
Polarization
Membranes
X ray diffraction
Glass
Substrates

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Template synthesis of highly oriented polyfluorene nanotube arrays. / Moynihan, Shane; Iacopino, Daniela; O'Carroll, Deirdre M; Lovera, Pierre; Redmond, Gareth.

In: Chemistry of Materials, Vol. 20, No. 3, 12.02.2008, p. 996-1003.

Research output: Contribution to journalArticle

Moynihan, S, Iacopino, D, O'Carroll, DM, Lovera, P & Redmond, G 2008, 'Template synthesis of highly oriented polyfluorene nanotube arrays', Chemistry of Materials, vol. 20, no. 3, pp. 996-1003. https://doi.org/10.1021/cm071658f
Moynihan, Shane ; Iacopino, Daniela ; O'Carroll, Deirdre M ; Lovera, Pierre ; Redmond, Gareth. / Template synthesis of highly oriented polyfluorene nanotube arrays. In: Chemistry of Materials. 2008 ; Vol. 20, No. 3. pp. 996-1003.
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