Frontiers in Magnetic Resonance

Frontiers in Magnetic Resonance

Electron Paramagnetic Resonance in Modern Carbon-Based Nanomaterials

This volume presents information about several topics in the field of electron paramagnetic resonance (EPR) study of carbon-containing nanomaterials. It introduces the reader to an array of ...
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Application of the Two-Temperature EPR Measurement Method to Carbonaceous Solids

Pp. 169-181 (13)

Andrzej B. Wieckowski and Grzegorz P. Słowik

Abstract

The two-temperature measurement method has found use in electron paramagnetic resonance (EPR) spectroscopy for determining the fraction of two kinds of paramagnetic species of different nature. The method can particularly be applied when the temperature dependence of EPR line intensity shows deviations from the Curie law. By applying this method it was possible to determine the fractions of paramagnetic centres responsible for the Curie- and the Pauli-like paramagnetism in carbon-based materials. The method has also found application when the origin of the EPR line was originated due to paramagnetic centres in spin doublet states (S = 1/2) and in excited spin triplet states (S = 1).

Keywords:

Carbonaceous solids, Carbon-based materials, Carbon black, Coal, Conduction electron spin resonance (CESR), Curie law, Curie paramagnetism, Decomposition of the EPR spectra, EPR, EPR line intensity, EPR linewidth, Macerals, Excited triplet states, Multi-walled carbon nanotubes (MWNT), Paramagnetic centres, Pauli paramagnetism, Pyrolytic carbon, Spin doublet states, Spin triplet states, Two-temperature EPR measurement method.

Affiliation:

Institute of Molecular Physics of the Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland.