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Applied Physics Letters / Volume 95 / Issue 26 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 95, 263301 (2009); doi:10.1063/1.3275727 (3 pages)

Hierarchical assembly of light-emitting polymer nanofibers in helical morphologies

Stefano Pagliara, Andrea Camposeo, Roberto Cingolani, and Dario Pisignano

National Nanotechnology Laboratory (NNL) of INFM-CNR- and Scuola Superiore ISUFI, Università del Salento, via Arnesano I-73100 Lecce, Italy

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(Received 25 June 2009; accepted 27 November 2009; published online 28 December 2009)

Single electrospun nanofibers of light-emitting conjugated polymers hierarchically assemble at nano- to macroscopic lengthscales in various helical morphologies. At nanoscopic lengthscales, molecular chains follow the microscopic assembly, prevalently aligning along the fiber dynamic axis, as demonstrated by polarized photoluminescence spectroscopy. The role of molecular weight in the resulting assembling and optical properties is highlighted and discussed. Nanofibers based on the heaviest polymer exhibit the most stretched helical geometries and the highest suppression of the excitonic energy migration, resulting in the most blue-shifted photoluminescence with respect to thin films.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

conducting polymers, nanofibres, photoluminescence, spectral line shift

PACS

  • 61.41.+e

    Polymers, elastomers, and plastics

  • 61.46.Df

    Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

  • 78.67.-n

    Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures

  • 78.55.Kz

    Solid organic materials

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.3275727

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (4) Tables (1)

Figures (click on thumbnails to view enlargements)

FIG.1
Top: macroscopic assembly of REP fibers (a), (b). Insets highlight the corresponding microscopic geometry for the selected regions. Bottom: Microscopic assembly of (c) BEP, (d) REP, and (e) YEP fibers.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
AFM micrograph of a REP fiber (average diameter 470 nm). Inset: Magnification of a straight segment of nanofiber with 130–180 nm features attributable to local agglomerations.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Polarized PL spectroscopy of single nanofiber. (a) Fluorescence micrograph of a YEP helix loop: The highlighted fiber segments, labeled as “A,” “B,” and “C” are individually investigated. The dashed lines indicates the nanofiber dynamic axes in the three probed regions. Scale bar = 2 μm. (b)–(d) PL∥ (continuous lines) and PL⊥ (dotted lines) spectra by segment “A” (b), “B” (c), and “C” (d), respectively.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
PL spectra from electrospun nanofibers (continuous lines) and reference spin-cast films (dotted lines) with same thickness, for (a) REP, (b) BEP, and (c) YEP. Insets: PL peak wavelength vs film thickness. Superimposed lines are guides for the eye.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Tables

Table I. Average polymer MW, characteristics of the helical geometries, and emission BS with respect to corresponding reference films, for the three investigated light-emitting nanofibers. Data on geometries are averages calculated over at least ten helix loops, on ten different fibers.

View Table


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