Miller, EK Lee, K Heeger, AJ Lee, JY Kim, DY Kim, CY 2024-01-21T19:07:08Z 2024-01-21T19:07:08Z 2021-09-01 1997-01 0379-6779 https://pubs.kist.re.kr/handle/201004/144192 Recent progress in the processing of conducting polypyrrole (PPy) from solution has made possible the spin-casting of optical quality films of varying thickness. We present the results of reflectance studies of soluble PPy films doped with dodecylbenzene sulfonic acid (DBSA) over a wide spectral range (.01 eV - 6 eV) at room temperature. The reflectance exhibits a plasma resonance at 1.7 eV and increases sharply at the lowest frequencies. These are the spectral features expected for a material with a partially filled conduction band. However, the corresponding optical conductivity and the real part of the dielectric function show low-frequency features characteristic of a conductor on the insulating side of the metal-insulator (M-I) transition. We conclude that there exists a finite density of localized states at the Fermi level, typical of a Fermi glass. The processibility and stability of this material make it attractive for applications such as transparent electrodes. English ELSEVIER SCIENCE SA LAUSANNE Reflectance studies of soluble polypyrrole doped with dodecylbenzene sulfonic acid Article 10.1016/S0379-6779(97)80874-0 1 SYNTHETIC METALS, v.84, no.1-3, pp.821 - 822 SYNTHETIC METALS 84 1-3 821 822 N scie scopus A1997WW43100341 2-s2.0-0030645802 Materials Science, Multidisciplinary Physics, Condensed Matter Polymer Science Materials Science Physics Polymer Science Article; Proceedings Paper METAL-INSULATOR-TRANSITION DISORDER CONDUCTIVITY POLYANILINE STATE infrared spectroscopy reflection spectroscopy metal-insulator phase transition polypyrrole