Polarons, Bipolarons, and Crystallization in Conducting Polymers: An ESR Study

✍ Scribed by M.S. Sercheli; L. Walmsley; C. Rettori; A.A. Correa; L.O.S. Bulhões; E.C. Pereira

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 70 KB
• Volume: 220
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200007)220:1<631::aid-pssb631>3.0.co;2-0

✦ Synopsis

Electron spin resonance (ESR) experiments give extremely important information concerning spin arrangements in conducting polymers. This is evidenced by the behavior of the ESR lines as a function of temperature and microwave power. Our ESR data of pressed pellets of ClO À 4 doped poly(3-methylthiophene) (P3MT) synthesized at 25 C show the predominance of polarons. Instead, the sample prepared at 5 C shows the predominance of bipolarons. Besides, for both types of samples, crystallization, observed from the ESR data, has shown a rearrangement of spin species.