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Roughness influence on the sheet resistance of the PEDOT:PSS printed on paper
Rogerio M. Morais,Maykel S. Klem,Maíza S. Ozorio,Tiago C. Gomes,Neri Alves 한국물리학회 2018 Current Applied Physics Vol.18 No.2
The use of paper as a platform to manufacture organic electronic devices, electronic paper, has expanding potential for many applications because of several properties offered. In this work, we show a study of PEDOT:PSS printed by inkjet on bond paper, vegetal paper and sheets of PET. The relation between the surface density of the deposited material, morphology and resistivity was investigated for samples printed with a commercial Hewlett-Packard(HP)® printer and Microsoft Word® software. The amount of material deposited, i.e. surface density, was controlled using the print number in the same position and changing the gray scale used in the image formation. Changing the surface density of printed PEDOT:PSS, it is possible to produce a continuous film permeating the papers fibers. Sheet resistances obtained, when 7.0 mg cm−2 of PEDOT:PSS were deposited on the surfaces, were: (a) 413.2 kΩ/Sq for bond paper, (b) 5.6 kΩ/Sq for vegetable paper and (c) 2.3 kΩ/Sq for PET. The exponential dependence of sheet resistance with the surface density of printed material allows us to evaluate the strong influence of substrate roughness on PEDOT:PSS conductivity and to predict, for each one, conditions to minimize it.
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Silva, Claudia Gomes,De Miguel, Maykel,Ferrer, Belen,Alvaro, Mercedes,Garcia, Hermenegildo Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.12
Cucurbiturils are cyclic oligomers of glycoluril units whose molecular shape defines an internal hollow space accessible through carbonyl portals. It is known that methyl viologen forms strong host-guest complexes with CB[7] and CB[8]. In the latter case even a dimer can be hosted inside CB[8]. Classical solution systems for visible light $H_2$ generation use methyl viologen as an electron relay. In this work we have found that the efficiency for $H_2$ generation of the photocatalytic system comprising EDTA.ruthenium tris(2,2'-bipyridyl)-methyl viologen-Pt increases when cucurbiturils are present in the solution. The enhancement follows the order CB[6] < CB[7] < CB[8]. By means of laser flash photolysis we have established that this efficiency increase arises from the combination of an increase in the relative quantum yield of charge separation (higher efficiency in the formation of $MV^{{\cdot}+}$) and a decrease of $MV^{{\cdot}+}$ lifetime.
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