Dielectric response and conductivity of poly(propylene oxide) sodium polyiodide complexes. Discussion of charge transfer by an ion relay mechanism
- Northwestern Univ., Evanston, IL (USA) Massachusetts Institute of Technology, Cambridge (USA)
- Northwestern Univ., Evanston, IL (USA)
The addition of iodine to poly(propylene oxide), PPO, with or without NaI results in the formation of polyiodides as evidenced by a resonance Raman band at 170 cm{sup {minus}1}. The conductivities of these complexes, measured with ac and dc methods, show both ohmic and nonohmic responses characteristic of electronic and ionic conductors, respectively. The conductivity rises with both increasing iodine and salt concentrations. Low-temperature conductivity data showed a very small inflection in the vicinity of T{sub g} for the host polymer, indicating that dynamics of the host polymer are only weakly coupled to the mechanism for conductivity in the polyiodide system. An ion relay along polyiodide chains is consistent with these observations. For comparison purposes, Raman spectra and conductivities were studied for structurally characterized metal compounds containing infinite I{sub 3}{sup {minus}} species. In these structures the conductivity is very low, and this is attributed to structural pinning of the polyiodides, which would block ion relay or carrier hopping charge transport.
- OSTI ID:
- 5360652
- Journal Information:
- Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 2:5; ISSN CMATE; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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