✍ Scribed by Gustavo M. do Nascimento; M´rcia L. A. Temperini
No coin nor oath required. For personal study only.
The effects of near‐IR (NIR) laser power over the Raman spectra of poly(aniline) emeraldine salt (PANI‐ES) and base (PANI‐EB) were investigated. The reasons for the existence of several bands from 1324 to 1500 cm^−1^ in the Raman spectra of poly(aniline) obtained at NIR region were also studied. The bands from 1324 to 1375 cm^−1^ were associated to νCN of polarons with different conjugation lengths and the bands from 1450 to 1500 cm^−1^ in Raman spectra of PANI emeraldine and pernigraniline base forms were correlated to νCN modes associated with quinoid units having different conjugation lengths. The increase of laser power at 1064.0 nm causes the deprotonation of PANI‐ES and the formation of cross‐linking segments having phenazine and/or oxazine rings. For PANI‐EB only a small spectral change is observed when the laser power is increased, owing to the low absorption of this form in the NIR region. Copyright © 2007 John Wiley & Sons, Ltd.
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