Raman resonances in sulfonate or Cl-doped PANI films

Marie-Claude Bernard; Vu Thi Bich; Susana Ines Cordoba de Torresi; Anne Hugot-Le Goff

doi:10.1117/12.279288

1 December 1997 Raman resonances in sulfonate or Cl-doped PANI films

Marie-Claude Bernard, Vu Thi Bich, Susana Ines Cordoba de Torresi, Anne Hugot-Le Goff

Proceedings Volume 3145, Optical Probes of Conjugated Polymers; (1997) https://doi.org/10.1117/12.279288
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The Raman spectra of polyaniline (PANI) doped by functionalized sulfonic acids present very few differences with the spectra obtained after doping by inorganic anions, in spite of the noticeable differences displayed elsewhere by their optical spectra: the 3 eV (localized polaron) as well as 1.5 eV bands are stronger and sharper in presence of sulfonate. In fact, during the study of the different PANI forms, it was observed that the connections between Raman and optical features are far from being straight; a simple analysis in terms of the resonance in either benzoid or quinoid units is not enough. To arrive to a better understanding of these connections, we have compared the Raman spectra obtained with blue (localized polaron excitation), red (excitonic resonance) and near-IR (intrachain excitations resonance) lines; with the green laser line, PANI is out of resonance. Spectra were also obtained on samples treated to present a `secondary doping', and therefore a strong IR absorption. The use of red and IR lights allows to study the splitting of the C equals N peak, which can clearly be decomposed in two sub-bands, as well as the splitting of the 1330 cm^-1 peak (assumed to be due to the stretching of C - N^+$CCL).

Citation Download Citation

Marie-Claude Bernard, Vu Thi Bich, Susana Ines Cordoba de Torresi, and Anne Hugot-Le Goff "Raman resonances in sulfonate or Cl-doped PANI films", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); https://doi.org/10.1117/12.279288

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available