Size Modification of Nanographite System of Activated Carbon Fibers Studied by EPR

• Authors: M. Kempiński , W. Kempiński , M. Śliwińska-Bartkowiak
• Languages of publication: EN

Abstracts

EN

We report results of EPR measurements of activated carbon fibers. Experiments made for pristine activated carbon fibers and activated carbon fibers with adsorbed molecules (CCl_4, C_6H_5NO_2, and H_2O) confirmed the localized character of paramagnetic centers observed in the system. Pristine activated carbon fibers are characterized by single Lorentzian line. Broader component of EPR signal appears when guest molecules are adsorbed in nanopores. The strongest localization is observed for water-filled activated carbon fibers nanopores (with hydrophobic pore walls) where changes in distance between nanographite particles were monitored by the g-shift to higher values. This process is related to stronger spin-orbit interaction of electrons trapped at nanographite particles compressed by guest molecules.

Keywords

EN

42.81.Uv; 73.20.-r; 73.22.-f; 76.30.-v; 74.78.Na

Discipline

• 73.20.-r: Electron states at surfaces and interfaces
• 74.78.Na: Mesoscopic and nanoscale systems
• 73.22.-f: Electronic structure of nanoscale materials and related systems
• 42.81.Uv: Fiber networks(see also 42.79.Sz Optical communication systems, multiplexers, and demultiplexers)
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 339-343

Dates

published

2005-08

received

2005-04-24

Contributors

author

M. Kempiński

• Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

W. Kempiński

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

author

M. Śliwińska-Bartkowiak

• Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.339