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Size Impact of Ordered P3HT Nanofibers on Optical Anisotropy
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-3368-9786
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2016 (English)In: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 217, no 9, p. 1089-1095Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline structures with semiconductor properties. When P3HT nanofi bers are dispersed in nonconducting solvent, they react to external alternate electric field by aligning along the field lines. This can be used to create layers of ordered nanofi bers and is referred to as alternating current poling method. P3HT nanofi bers with three different size distributions are fabricated, using self-assembly mechanism in marginal solvents, and used for the alignment studies. Anisotropic absorption of oriented 2 mu m long nanofi bers exponentially increases with the magnitude of applied field to a certain asymptotic limit at 0.8 V mu m(-1), while 100-500 nm long nanofi bers respond to electric field negligibly. Effective optical birefringence of oriented 2 mu m long nanofi bers is calculated, based on the phase shift at 633 nm and the average layer thickness, to be 0.41. These results combined with further studies on real-time control over orientation of P3HT nanofi bers in liquid solution or host system are promising in terms of exploiting them in electroabsorptive and electrorefractive applications.

Place, publisher, year, edition, pages
John Wiley & Sons, 2016. Vol. 217, no 9, p. 1089-1095
Keywords [en]
anisotropic optical materials, electro-optical materials, optical properties, polymers
National Category
Engineering and Technology Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-188070DOI: 10.1002/macp.201500516ISI: 000375688500008Scopus ID: 2-s2.0-84964734770OAI: oai:DiVA.org:kth-188070DiVA, id: diva2:939655
Note

QC 20160620

Available from: 2016-06-20 Created: 2016-06-03 Last updated: 2017-12-29Bibliographically approved
In thesis
1. Electro-optical properties of one-dimensional organic crystals
Open this publication in new window or tab >>Electro-optical properties of one-dimensional organic crystals
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The recent development of photonics and applications puts new challenges for systems using emission, transmission and modulation of light. For these reasons, novel optical materials attract a special interest for their enabling properties for novel technologies.

In this work, we performed the research on fundamental properties and the possibility of implementation of electro-optical response of Poly-3-hexylthiophene-2,5-diyl (P3HT) nanofibers, which belong to the class of organic semiconductor crystalline materials. Our research demonstrated that an external electric field allows controlling the orientation of nanofibers dispersed in a solution by changing the electrical properties of P3HT crystals. This method was used to introduce a collective alignment of P3HT nanofibers and to impact the optical properties of the colloid. The spectroscopic and polarization measurements show that P3HT nanofibers possess optical anisotropy in a wide range of visible spectrum. This property combined with the ability to manipulate the orientation of nanofibers dynamically, was used for direct phase and intensity modulation of transmitted light. Along with these investigations, several engineering and technology tasks were solved. We have designed the transverse electro-optical cell using all-optical-fiber approach, as well as the longitudinal electro-optical cell was fabricated using a novel polymer molding technique.

The obtained research results demonstrate the potential of P3HT crystalline nanofibers as a material class of large niche of applications, not only limited to photovoltaics but also being implemented in electro-optical systems to control light polarization and propagation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 55
National Category
Nano Technology
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-220529 (URN)
Public defence
2017-11-24, Sal C, Electrum, Stockholm, 10:00 (English)
Supervisors
Note

QC 20171229

Available from: 2017-12-29 Created: 2017-12-22 Last updated: 2018-01-18Bibliographically approved

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Lobov, Gleb S.Zhao, YichenYan, MinLi, JiantongSugunan, AbhilashThylen, LarsWosinski, LechOstling, MikaelToprak, Muhammet S.Popov, Sergei
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