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- W2008996043 abstract "Recent progress in the processing of conducting polyaniline (PANI) protonated with functionalized sulfonic acids [such as camphor sulfonic acid (CSA)] has enabled the fabrication of high-quality, homogeneous films with excellent surface quality. We present measurements of the reflectivity of such PANI-CSA films over a wide spectral range (0.006--6 eV) at temperatures from 10 to 300 K. The reflectance spectra of PANI-CSA are characterized by metal-like signatures in the infrared (IR), including high reflectance in far IR and a plasma resonance around 1.2 eV. However, the optical conductivity ensuremath{sigma}(ensuremath{omega}) and the real part of the dielectric function, ${mathrm{ensuremath{varepsilon}}}_{1}$(ensuremath{omega}), are not typical of a Drude metal; ensuremath{sigma}(ensuremath{omega}) is suppressed below the Drude extrapolation as ensuremath{omega}ensuremath{rightarrow}0 with a peak around 0.2 eV, and ${mathrm{ensuremath{varepsilon}}}_{1}$(ensuremath{omega})>0 below 0.2 eV. These features arise from disorder-induced localization (Anderson localization) in PANI-CSA. We present a quantitative analysis of ensuremath{sigma}(ensuremath{omega}) and ${mathrm{ensuremath{varepsilon}}}_{1}$(ensuremath{omega}) in terms of the localization-modified Drude model. The analysis indicates that the mean free path is approximately 7 AA{}, comparable to the structural repeat unit along the PANI chain, implying that PANI-CSA is a disordered metal on the metal-insulator boundary." @default.
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- W2008996043 date "1993-11-15" @default.
- W2008996043 modified "2023-10-11" @default.
- W2008996043 title "Reflectance of polyaniline protonated with camphor sulfonic acid: Disordered metal on the metal-insulator boundary" @default.
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- W2008996043 doi "https://doi.org/10.1103/physrevb.48.14884" @default.
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