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Conducting Helical Structures from Celery Decorated with a Metallic Conjugated Polymer Give Resonances in the Terahertz Range
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Ctr Phys Sci and Technol, Lithuania; TERAVIL Ltd, Lithuania.
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2018 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 28, no 24, article id 1706595Article in journal (Refereed) Published
Abstract [en]

A method to decorate cellulose-based helices retrieved from the plant celery with a conductive polymer is proposed. Using a layer-by-layer method, the decoration of the polyanionic conducting polymer poly(4-(2,3-dihydrothieno [3,4-b]-[1,4]dioxin-2-yl-methoxy)-1-butanesulfonic acid (PEDOT-S) is enhanced after coating the negatively charged cellulose helix with a polycationic polyethyleneimine. Microscopy techniques and two-point probe are used to image the structure and measure the conductivity of the helix. Analysis of the optical and electrical properties of the coated helix in the terahertz (THz) frequency range shows a resonance close to 1 THz and a broad shoulder that extends to 3.5 THz, consistent with electromagnetic models. Moreover, as helical antennas, it is shown that both axial and normal modes are present, which are correlated to the orientation and antenna electrical lengths of the coated helices. This work opens the possibility of designing tunable terahertz antennas through simple control of their dimensions and orientation.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 28, no 24, article id 1706595
Keywords [en]
biotemplating; cellulose; conducting polymer; terahertz
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-149346DOI: 10.1002/adfm.201706595ISI: 000434946700017OAI: oai:DiVA.org:liu-149346DiVA, id: diva2:1229831
Note

Funding Agencies|Strategic Research Foundation through the project OPEN; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 2009-00971]; Knut and Alice Wallenberg Foundation; Swedish Foundation for Strategic Research (SSF) [RIF14-055]

Available from: 2018-07-02 Created: 2018-07-02 Last updated: 2018-07-02

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