Abstract
Recent advances in microelectronic and optoelectronic industries have spurred interest in the development of reticulate doped polymer films containing “metallic” charge transfer complexes. In this study, such reticulate doped polymer films were prepared by exposing solid solutions of bis(ethylenedioxy) tetrathiafulvalene (BEDO-TTF) in polycarbonate (PC) to iodine, forming conductive charge transfer complexes. The resulting films exhibited room temperature conductivities ranging from 6.33 to S cm−1. The colored iodine complexes in the film were reduced by cyclic voltammetry yielding conductive, colorless, transparent films. We were intrigued to examine the dielectric properties of BEDO-TTF in solid solution in PC prior to formation of the charge transfer complex as no such studies appear in the literature. Dielectric analysis (DEA) was used to probe relaxations in neat PC and BEDO-TTF/PC. BEDO-TTF plasticized the PC and decreased the glass transition temperature. Two secondary relaxations appeared in PC films, whereas the transitions merged in the BEDO-TTF/PC film. DEA also evidenced conductivity relaxations above 180°C which are characterized via electric modulus formalism and revealed that BEDO-TTF increased AC conductivity in PC.
Highlights
In the last few decades, there has been growing interest in conductive polymers and composites due to an array of potential applications in biological and chemical sensors, separations, microelectronics circuit boards, biomedical, coatings, and optical displays [1,2,3,4,5]
This paper describes the processing of a series of reticulate doped polymer (RDP) charge transfer complexes
The secondary relaxation, β, in PC has been widely studied by a host of techniques such as NMR [45,46,47,48], neutron scattering [49], molecular dynamic simulations [50], dynamic mechanical spectroscopy [51,52,53,54], dielectric analysis [55, 56], depolarized Rayleigh scattering
Summary
In the last few decades, there has been growing interest in conductive polymers and composites due to an array of potential applications in biological and chemical sensors, separations, microelectronics circuit boards, biomedical, coatings, and optical displays [1,2,3,4,5]. After the discovery of the first organic superconductor, (TMTSeF)2PF6, a growing number of organic charge transfer complexes and conductive salts have been investigated [8] These salts exhibit a charge transfer between a donors and acceptors in the solid state; the donors and acceptors molecules form segregated stacked sheets of cations and anions, respectively [9,10,11]. Jeszka and coworkers prepared films with BEDO-TTF/PC complexed with iodine and bromine to yield charge transfer complexes with conductive surfaces [26] Both exhibited metallic properties; the Br doped films were clear, while the iodine films were dark colored and did not transmit light. This paper describes the processing of a series of RDP charge transfer complexes It reports on electrochemical methodology used to control the oxidation state of iodine species and to induce transparency in the BEDO-TTF/iodine films [28]. No DEA analysis has been undertaken on these interesting systems
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