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https://hdl.handle.net/11147/1902
Title: | Hierarchial Coassembly of a Cyanine Dye in Poly(vinyl Alcohol) Fibrous Films by Electrospinning | Authors: | Demir, Mustafa Muammer Horzum, Nesrin Özen, Bengisu Özçelik, Serdar |
Keywords: | Electrospinning Aggregates Fibers Fourier transform infrared spectroscopy Polyvinyl alcohols |
Publisher: | American Chemical Society | Source: | Demir, M. M., Horzum, N., Özen, B., and Özçelik, S. (2013). Hierarchial coassembly of a cyanine dye in poly(vinyl alcohol) fibrous films by electrospinning. Journal of Physical Chemistry B, 117(37), 10920-10928. doi:10.1021/jp404977d | Abstract: | We report molecular aggregate formation of TTBC (1,1′,3,3′- tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine) in submicrometer-sized PVA (poly(vinyl alcohol)) fibers by electrospinning. The formation of the molecular aggregate is examined by solution and instrumental parameters of electrospinning. The precursor solution of PVA/TTBC, in the range of 0.016-0.065 wt % is subjected to electrospinning under an electrical field ranging from 0.95 to 1.81 kV cm-1. Both randomly deposited and uniaxially aligned fibers are achieved by using two parallel-positioned metal strips as counter electrode. Photoluminescence and polarized Fourier transform infrared spectroscopies are employed to determine spectral properties of the fibers. H-aggregates are formed within the electrospun fibers, regardless of their alignment, and H- and J-type aggregates coexist in the alternative spin-coated and the cast films. A strongly polarized photoluminescence emission is observed in the direction of uniaxially aligned fibers as a result of the orientation of the H-aggregates along the fiber axis. We demonstrate that electrospinning is a process capable of forming and orienting TTBC aggregates during the structural development of the polymer/dye nanofibers. These fibrous films may potentially find applications in optics and electronics. | URI: | http://doi.org/10.1021/jp404977d http://hdl.handle.net/11147/1902 |
ISSN: | 1520-6106 1520-5207 1520-6106 |
Appears in Collections: | Chemistry / Kimya Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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