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Title: Highly conductive PEDOT:PSS films prepared through a treatment with geminal diols or amphiphilic fluoro compounds
Authors: Xia, Y. 
Ouyang, J. 
Keywords: Amphiphilic compound
Conductivity enhancement
Geminal diol
Insulator-to-metal transition
Issue Date: Oct-2012
Citation: Xia, Y., Ouyang, J. (2012-10). Highly conductive PEDOT:PSS films prepared through a treatment with geminal diols or amphiphilic fluoro compounds. Organic Electronics: physics, materials, applications 13 (10) : 1785-1792. ScholarBank@NUS Repository.
Abstract: Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films with high conductivity can have important application as the transparent electrode of optoelectronic devices. In this paper, we report the significant conductivity enhancement of PEDOT:PSS through a treatment with germinal diols which have two hydroxyl groups connected to one carbon atom or amphiphilic fluoro compounds which have hydrophobic fluorocarbon groups and hydrophilic hydroxyl or carboxylic groups. Several compounds, including hexafluoroacetone, cyclohexanehexone, formaldehyde, acetaldehyde, and perfluorobenzophenone, which could convert into geminal diols, were used to treat PEDOT:PSS films. The conductivity enhancements are generally consistent with the equilibrium constants for the conversion of these compounds into geminal diols. PEDOT:PSS films were also treated with several amphiphilic fluoro compounds. The conductivity was significantly enhanced when PEDOT:PSS films were treated with hexafluoroisopropanol, trifluoroacetic acid and heptafluorobutyric acid, while it hardly changed when they were treated with 2,2,2-trifluoroethanol. Conductivities of more than 1000 S cm -1 were observed on the treated PEDOT:PSS films. The mechanism for the conductivity enhancement of PEDOT:PSS through the treatment with geminal diols or amphiphilic fluoro compounds is attributed to the phase segregation of PSSH from PEDOT:PSS and conformational change of the PEDOT chains as the results of the compounds-induced reduction in the Coulombic attraction between the positively charged PEDOT and negatively charged PSS chains. © 2012 Elsevier B.V. All rights reserved.
Source Title: Organic Electronics: physics, materials, applications
ISSN: 15661199
DOI: 10.1016/j.orgel.2012.05.039
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