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Microscopic Electrical Conductivity of Nanodiamonds after Thermal and Plasma Treatments

Published online by Cambridge University Press:  09 February 2016

Jan Čermák*
Affiliation:
Institute of Physics ASCR, Cukrovarnická 10, 16200 Prague 6, Czech Republic.
Halyna Kozak
Affiliation:
Institute of Physics ASCR, Cukrovarnická 10, 16200 Prague 6, Czech Republic.
Štěpán Stehlík
Affiliation:
Institute of Physics ASCR, Cukrovarnická 10, 16200 Prague 6, Czech Republic.
Vladimír Švrček
Affiliation:
Research Center for Photovoltaics, AIST, Tsukuba, 305-8568, Japan
Vincent Pichot
Affiliation:
Nanomatériaux pour les Systèmes Sous Sollicitations Extremes (NS3E), UMR 3208 ISL/CNRS/Unistra, Institut franco-allemand de recherches de Saint-Louis (ISL), 5, rue du Général Cassagnou, 68300 Saint-Louis, France
Denis Spitzer
Affiliation:
Nanomatériaux pour les Systèmes Sous Sollicitations Extremes (NS3E), UMR 3208 ISL/CNRS/Unistra, Institut franco-allemand de recherches de Saint-Louis (ISL), 5, rue du Général Cassagnou, 68300 Saint-Louis, France
Alexander Kromka
Affiliation:
Institute of Physics ASCR, Cukrovarnická 10, 16200 Prague 6, Czech Republic.
Bohuslav Rezek
Affiliation:
Institute of Physics ASCR, Cukrovarnická 10, 16200 Prague 6, Czech Republic. Faculty of Electrical Engineering, Czech Technical University, Technická 10, 16627 Prague 6, Czech Republic.
*
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Abstract

Atomic force microscopy (AFM) is used to measure local electrical conductivity of HPHT nanodiamonds (NDs) dispersed on Au substrate in the as-received state and after thermal or plasma treatments. Oxygen-treated NDs are highly electrically resistive, whereas on hydrogen-treated NDs electric current around -200 pA at -2 V is detected. The as-received NDs as well as NDs after an underwater radio-frequency (RF) plasma or laser irradiation (LI) treatments contain both electrically conductive (two types: highly and weakly conductive) and highly resistive particles. The higher conductivity is attributed to H-terminated (RF) or graphitized (LI) NDs. The lower conductivity is attributed to NDs with hydrogenated amorphous carbon shell.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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References

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