Electron paramagnetic resonance in conductive polymers

• Grant number: 07/00852-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2007
• End date: April 30, 2008
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Lygia Christina de Moura Walmsley
• Grantee: Jorge Douglas Massayuki Kondo
• Host Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

Electron Paramagnetic Resonance (EPR) is a technique that allow to get much more information about magnetic moments in conducting polymers than d.c. and a.c. susceptibility measurements. Being a microscopic technique allows to study the environment of the magnetic moment, the magnetization relaxation mechanisms, the interactions with other magnetic moments and to separate contributions from localized and delocalized magnetic moments. Since conducting polymers are organic systems, constituted of light elements, the spin-orbit interaction constant, which is proportional to the fourth power of the atomic number, is small, allowing the observation of room temperature narrow EPR lines, and the study of conducting polymers using this technique. (AU)