ATR-Infrared Spectroscopic Study of n-Doped Polyacetylene Films

Jin-Yeol Kim; Jae-Taek Kim; Min-Hee Kwon; Dong-Kyu Han; Si-Joong Kwon

Macromolecular Research, Vol.15, No.1, 5-9, February, 2007

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ATR-Infrared Spectroscopic Study of n-Doped Polyacetylene Films

Jin-Yeol Kim^†, Jae-Taek Kim, Min-Hee Kwon, Dong-Kyu Han, and Si-Joong Kwon¹

School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Korea
¹R&D Center, Nanoenics Inc., Seoul 136-702, Korea

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The attenuated total reflection infrared (ATR-IR) spectra of trans-polyacetylene (trans-PA) film doped with sodium (n-doping) were observed in the range of 1900 to 700 cm-1. The observed IR bands were attributed to negatively charged domains created by n-doping electrons. The doping-induced IR bands showed considerable difference from its pristine film. After doping, the out-of-plane CH deformation band of the strong 1010 cm-1 region in the pristine film disappeared while several new bands were observed at 1600 (due to C=C stretching), 1400 (due to in-plane CH bending), 1290 and 1174 (due to CH stretching), and 880 cm-1 (due to CC stretching) regions for Nadoped PA. In particular, a weak band of C=C stretching at 1600 cm-1 was newly obtained for the first time in the present study. The electro conductivity of the doped trans-PA film was 102 S/cm and the origins of doping-induced IR bands are discussed in terms of solitons and polarons.

Keywords:polyacetylene;infrared spectroscopy;conducting polymer

[References]

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Heeger A, Kivelson S, Schrieffer R, Su W, Rev. Mod. Phys., 60, 781 (1988)
Harada I, Furukawa Y, Tasumi M, Shirakawa H, Ikeda S, J. Chem. Phys., 73, 4746 (1980)
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[1] Chiang C, Fincher C, Park Y, Heeger A, Shirakawa H, Louis E, Gau S, MacDiarmid A, Phys. Rev. Lett., 39, 1098 (1997)

[2] Shirakawa H, Louis E, MacDiarmid A, Chiang C, Heeger A, J. Chem. Soc. Chem. Commun., 578 (1977)

[3] Chung T, Moraes F, Flood J, Heeger A, Phys. Rev. B, 29, 2341 (1984)

[4] Ikeda S, Kaufer J, Woerner T, Pron A, Druy M, Sivak A, Heeger A, MacDiarmid A, Phys. Rev. Lett., 45, 1123 (1980)

[5] Heeger A, Kivelson S, Schrieffer R, Su W, Rev. Mod. Phys., 60, 781 (1988)

[6] Harada I, Furukawa Y, Tasumi M, Shirakawa H, Ikeda S, J. Chem. Phys., 73, 4746 (1980)

[7] Inagaki F, Tasumi M, Miyazawa T, J. Raman Spectrosc., 3, 335 (1975)

[8] Mele E, Hicks J, Phys. Rev. B, 32, 2703 (1977)

[9] Vardeny Z, Tanaka J, Fujimoto H, Tanaka M, Solid State Commun., 50, 937 (1984)

[10] Vardeny Z, Orenstein J, Baker G, Phys. Rev. Lett., 50, 2032 (1983)

[11] Mulazzi E, Brivo G, Faulques E, Lefrant S, Solid State Commun., 46, 851 (1983)

[12] Tiziani R, Brivio G, Mulazzi E, Phys. Rev. B, 31, 4015 (1985)

[13] Zannoni G, Zerbi G, Chem. Phys. Lett., 87, 50 (1982)

[14] Zannoni G, Zerbi G, Chem. Phys. Lett., 87, 55 (1982)

[15] Zannoni G, Zerbi G, J. Mol. Struct., 100, 505 (1983)

[16] Peluso A, Seel M, Ladik J, Can. J. Chem., 63, 1553 (1985)

[17] Gussoni M, Castiglioni C, Zerbi C, J. Phys. Chem., 88, 600 (1984)

[18] Castiglioni C, Castiglioni C, Zerbi C, J. Chem. Phys., 82, 3534 (1985)

[19] Gussoni M, Castiglioni C, Zerbi C, J. Chem. Phys., 80, 1377 (1984)

[20] Gussoni M, Castiglioni C, Zerbi C, Chem. Phys. Lett., 99, 101 (1983)

[21] Mori Y, Kurihara S, Synth. Met., 22, 219 (1987)

[22] Mori Y, Kurihara S, Synth. Met., 24, 357 (1988)

[23] Mori Y, Kurihara S, Synth. Met., 30, 447 (1989)

[24] Viller H, Dupuis M, Clementi E, Phys. Rev. B, 37, 2520 (1988)

[25] Viller H, Dupuis M, Clementi E, J. Chem. Phys., 88, 5252 (1987)

[26] Ito T, Shirakawa H, Ikeda S, J. Polym. Sci. A: Polym. Chem., 12, 11 (1974)

[27] Furukawa Y, Ohta H, Sakamoto A, Tasumi M, Spectroc. Acta Pt. A-Molec. Biomolec. Spectr., 47A, 1369 (1991)

[28] Kim J, Ando S, Sakamoto A, Furukawa Y, Tasumi M, Synth. Met., 89, 149 (1997)

[29] Watson W, McMordie W, Lands L, J. Polym. Sci., 55, 137 (1961)

[30] Lunde K, Zechmeister L, Acta Chem. Scand., 8, 1421 (1954)

[31] Bellamy L, in The Infrared Spectra of Complex Molecules, John Wily and Sons, Inc., New York (1954)

[32] Kim J, Kim E, Sohn D, Sakamoto A, Tasumi M, Bull. Korean Chem. Soc., 22, 833 (2001)

[33] Piaggio P, Dellepiane G, Mulazzi E, Tubino R, Polymer, 28, 563 (1987)

[34] Rabolt J, Clarke T, Street G, J. Chem. Phys., 71, 4614 (1979)

[35] Su W, Schrieffer J, Heeger A, Phys. Rev. Lett., 42, 1698 (1979)

[36] Kivelson S, Heeger A, Phys. Rev. Lett., 55, 308 (1985)