KIM, DY LEE, JY KIM, CY KANG, ET TAN, KL 2024-01-21T20:40:26Z 2024-01-21T20:40:26Z 2021-09-02 1995-06 0379-6779 https://pubs.kist.re.kr/handle/201004/145077 The differences in protonation and charge transfer behavior between polypyrrole (PPY) powders and films doped with inorganic acids, such as H2SO4 and HClO4, or bulky acids, such as dodecylsulfonic acid (DS), toluene-4-sulfonic acid (TSA), dodecylbenzensulfonic acid (DBSA) and poly(styrenesulfonic acid) (PSSA), were assessed quantitatively by the X-ray photoelectron spectroscopic (XPS) technique. PPY-dodecylsulfate and PPY-toluene-4-sulfonate films with [N+]/[N] ratio over 40% can be readily prepared electrochemically. Treatment of these salt films with a base results in the 25% deprotonated PPY. Reprotonation of the 25% deprotonated PPY films (containing 25% =N- units) by excess bulky acids readily results in complexes with surface [N+]/[N] ratios substantially above 50%. For deprotonated PPY films loaded with excess inorganic acids, and deprotonated PPY powders loaded with excess simple or bulky acids, the protonation level or [N+]/[N] ratio remains in the order of 25 to 30%. Raman and UV-Vis spectroscopies show little difference in structures of PPY formed chemically and electrochemically, but morphologies of cross sections of the simple and bulky anion-doped samples look different from each other. The enhanced charge transfer interaction in PPY-bulky anion films is probably attributable to the counter-ion-induced molecular 'blending' between the polymer and the dopant. English ELSEVIER SCIENCE SA POLYANILINE POLYMERS BIPOLARONS PYRROLE STATES DIFFERENCE IN DOPING BEHAVIOR BETWEEN POLYPYRROLE FILMS AND POWDERS Article 10.1016/0379-6779(95)03286-X 1 SYNTHETIC METALS, v.72, no.3, pp.243 - 248 SYNTHETIC METALS 72 3 243 248 scie scopus A1995RD39400007 2-s2.0-0029322789 Materials Science, Multidisciplinary Physics, Condensed Matter Polymer Science Materials Science Physics Polymer Science Article POLYANILINE POLYMERS BIPOLARONS PYRROLE STATES POLYPYRROLE DOPING SPECTROSCOPY PROTONATION LEVEL BULKY ANION ELECTROCHEMICAL FILMS FILMS