- Organic Thin-Film Transistors Fabricated by Solution-Processed and Low-Temperature Condensed Hybrid Gate Dielectrics
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Herein, we report on the preparation of new solution-processed and low-temperature condensed organic–inorganic hybrid dielectric films and their electrical properties for applications in low-power organic thin-film transistors (OTFTs). The low-temperature condensed hybrid dielectric films (~19 nm thick) were simply fabricated by spin coating a mixture solution of a zirconium chloride and synthesized bifunctional phosphonic acid organic reagents, followed by annealing at a relatively low temperature (~90 °C). The prepared hybrid dielectric films exhibited excellent dielectric properties (low leakage current density ?6 A/cm2 and high capacitance of 520 nF/cm2) as well as a smooth surface (RMS roughness a relatively low operating bias (?2 V) and exhibited great TFT characteristics (hole mobility: 0.3 cm2/V/s, low threshold voltage: ?0.7 V, low subthreshold swing: 0.17 V/dec, on/off current ratio: 105).
- Song, Youngmin,Ha, Young-Geun
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- High yield synthesis of some phosphonic acid derivatives as surface tethers for energy harvesting technologies
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Efficient synthesis of novel 6-(2-bromo-2-methyl propanoyloxy)hexyl phosphonic acid, dodecane di-phosphonic acid, 6-(thiophene-3-carbonyloxy)hexyl phosphonic acid, octadecyl phosphonic acid and such other derivatives are reported here. These derivatives have a potential application as tethers to nanoparticle surfaces that can promote efficient electron transfer process in solar energy conversion.
- Mungalimane, Amshumali
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p. 143 - 148
(2014/03/21)
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- Rapid one-pot synthesis of alkane-α ω, diylbisphosphonic acids from dihalogenoalkanes under microwave irradiation
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A one-pot, two-step synthesis of alkylenebisphosphonic acids from dihalogenoalkanes was performed under microwave irradiation. The reaction is very rapid and convenient for the synthesis of small samples of alkylenebisphosphonic acids. Copyright Taylor & Francis Group, LLC.
- Villemin, Didier,Moreau, Bernard,Kaid, M'Hamed,Didi, Mohamed Amine
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experimental part
p. 1583 - 1586
(2010/10/01)
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- Microwave michaelis-becker synthesis of diethyl phosphonates, tetraethyl diphosphonates, and their total or partial dealkylation
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Diethyl phosphonates and tetraethyl alkyldiphosphonates were efficiently and rapidly prepared via the Michaelis-Becker reaction, under microwave irradiation. These compounds were then hydrolyzed to phosphonic and diphosphonic acids or selectively monodealkylated to give monoesters of phosphonic acids and symmetrical diethyl esters of diphosphonic acids. These reactions were also achieved rapidly in satisfactory yields with microwave methodology. This methodology was applied with success to the functionalization of a polymer resin.
- Meziane, Dalila,Hardouin, Julie,Elias, Abdelhamid,Guenin, Erwann,Lecouvey, Marc
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experimental part
p. 369 - 377
(2010/07/16)
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- The role of substrate identity in determining monolayer motional relaxation dynamics
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We report on the lifetime and motional dynamics of Zirconium Phosphonate (ZP) monolayers containing oligothiophene chromophores in a range of concentrations. Monolayers were formed on fused silica substrates and on a 15 ? oxide layer formed on crystalline Si(100) substrates. For both interfaces, the fluorescence lifetime behavior of the chromophores is identical and does not depend on chromophore concentration within the monolayer. Transient anisotropy measurements reveal that, for both substrates, the chromophores are oriented at ~35°with respect to the surface normal. For monolayers formed on silica, there is no evidence for chromophore motion, while motion is seen for monolayers formed on silicon. Despite the substantial similarity between the two families of monolayers, the surface roughness of the primed silicon substrate allows for greater motional freedom of the chromophores in the monolayers. We discuss these findings in the context of the differences in substrate surface roughness and domain sizes as measured by atomic force microscopy (AFM).
- Horne,Blanchard
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p. 6336 - 6344
(2007/10/03)
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