Ivanko, Iryna; Pánek, Ji?í; Svoboda, Jan; Zhigunov, Alexander; Tomík, Elena
Tuning the photoluminescence and anisotropic structure of PEDOT
In the current work, we study the photoluminescence and anisotropic structure of PEDOT which is obtained in the presence of ions that perturb the water structure (ions in Hofmeister series). The water content in PEDOT has been confirmed by TGA and DSC measurements. The weight loss and heat flux together…
Comprehensive Investigation and Analysis of Bulk-Heterojunction Microstructure of High-Performance PCE11:PCBM Solar Cells
Zhang, Chaohong; Heumueller, Thomas; Gruber, Wolfgang; Almora, Osbel; Du, Xiaoyan; Ying, Lei; Chen, Junwu; Unruh, Tobias; Cao, Yong; Li, Ning; Brabec, Christoph J.
Worldwide research efforts have been devoted to organic photovoltaics in the hope of a large-scale commercial application in the near future. To meet the industrial production requirements, organic photovoltaics that can reach power conversion efficiency (PCE) of over 10% along with promising operational device stability are of utmost interest. In…
Pure PEDOT:PSS hydrogels
Lu, Baoyang; Yuk, Hyunwoo; Lin, Shaoting; Jian, Nannan; Qu, Kai; Xu, Jingkun; Zhao, Xuanhe
Hydrogels of conducting polymers provide an electrical interface with biological tissues for sensing and stimulation, but currently have compromised mechanical and electrical properties. Here, the authors show a simple method to achieve pure PEDOT:PSS hydrogels that exhibit superior mechanical and electrical properties, stability, and tunable
Sulfo-Phenylated Polyphenylenes Containing Sterically Hindered Pyridines
Xu, Shaoyi; Adamski, Michael; Killer, Miho; Schibli, Eric M.; Frisken, Barbara J.; Holdcroft, Steven
We systematically investigated the effect of incorporating a sterically hindered pyridyl group into a sulfo-phenylated polyphenylene to control the polymers physicochemical properties through acidbase interactions. Homopolymers with similar molecular weights and comparable structures that vary by only one atom (N vs C?) per repeat unit along the polymer chain were…
Slow Magnetic Relaxation of Co(II) Single Chains Embedded within MetalOrganic Superstructures
Kawamura, Airi; Filatov, Alexander S.; Anderson, John S.; Jeon, Ie-Rang
Two coordination polymers of the type Co(BPDC)(N-ox), with BPDC being 4,4?-biphenyldicarboxylate and N-ox being pyridine N-oxide (PNO) or isoquinoline N-oxide (IQNO), have been synthesized and characterized. The compounds feature 2D and 3D metalorganic networks that encapsulate Co(II)-based chains in a rigid superstructure. The dc and ac magnetic properties of these…
Tuning charge transport dynamics via clustering of doping in organic semiconductor thin films
Boyle, Connor J.; Upadhyaya, Meenakshi; Wang, Peijian; Renna, Lawrence A.; Lu-Díaz, Michael; Jeong, Seung Pyo; Hight-Huf, Nicholas; Korugic-Karasz, Ljiljana; Barnes, Michael D.; Aksamija, Zlatan; Venkataraman, D.
A significant challenge in the rational design of organic thermoelectric materials is to realize simultaneously high electrical conductivity and high induced-voltage in response to a thermal gradient, which is represented by the Seebeck coefficient. Conventional wisdom posits that the polymer alone dictates thermoelectric efficiency. Herein, we show that doping …
Structural correlations tailor conductive properties in polymerized ionic liquids
Doughty, Benjamin; Genix, Anne-Caroline; Popov, Ivan; Li, Bingrui; Zhao, Sheng; Saito, Tomonori; Lutterman, Daniel A.; Sacci, Robert L.; Sumpter, Bobby G.; Wojnarowska, Zaneta; Bocharova, Vera
Polymerized ionic liquids (PolyILs) are promising materials for applications in electrochemical devices spanning from fuel cells to capacitors and batteries. In principle, PolyILs have a competitive advantage over traditional electrolytes in being single ion conductors and thus enabling a transference number close to unity. Despite this perceived advantage, surprisingly low…
Morphological Evolution of Poly(solketal methacrylate)-block-polystyrene Copolymers in Thin Films
Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Mapas, Jose Kenneth D.; Rzayev, Javid; Russell, Thomas P.
The morphological evolution of the lamellar microdomains in the thin films of symmetric poly(solketal methacrylate-b-styrene) (PSM-b-PS) copolymers that can be converted into poly(glycerol monomethacrylate-b-styrene) (PGM-b-PS) copolymers through acid hydrolysis reaction was investigated. This simple chemical transformation was performed in the solid state using trifluoroacetic acid vapor,
Microwave-assisted DielsAlder polycondensation of proton conducting poly(phenylene)s
Adamski, Michael; Skalski, Thomas J. G.; Xu, Shaoyi; Killer, Miho; Schibli, Eric M.; Frisken, Barbara J.; Holdcroft, Steven
An exploratory microwave-assisted synthesis of a promising proton-conducting, DielsAlder poly(phenylene) is reported and comprehensively compared against a traditional, thermal polymerization approach. A 24-fold reduction in reaction time is achieved by microwave synthesis. Characterization of polymers prepared by microwave-assisted synthesis vs. the thermal approach reveals little difference in
Poly(bis-arylimidazoliums) possessing high hydroxide ion exchange capacity and high alkaline stability
Fan, Jiantao; Willdorf-Cohen, Sapir; Schibli, Eric M.; Paula, Zoe; Li, Wei; Skalski, Thomas J. G.; Sergeenko, Ania Tersakian; Hohenadel, Amelia; Frisken, Barbara J.; Magliocca, Emanuele; Mustain, William E.; Diesendruck, Charles E.; Dekel, Dario R.; Holdcroft, Steven
The hydroxide anion exchange polymers are key materials of solid polymer electrolyte devices that operate under alkaline conditions. Here the authors show the rational design of such polymers that exhibit high ion exchange capacity and exceptional stability under highly caustic