Observation of Conducting Structures in Detonation Nanodiamond Powder by Electron Paramagnetic Resonance

We have used electron paramagnetic resonance (EPR) to study high-purity detonation nanodiamond (DND) powders at room temperature. In recording the EPR signal with g factor 2.00247 and line width 0.890 mT, with automatic frequency control locking the frequency of the microwave generator (klystron) to...

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Bibliographic Details
Published inJournal of applied spectroscopy Vol. 84; no. 6; pp. 999 - 1005
Main Authors Binh, Nguyen Thi Thanh, Dolmatov, V. Yu, Lapchuk, N. M.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.01.2018
Springer
Springer Nature B.V
Subjects
ABSORPTION
Analytical Chemistry
Anisotropy
Atomic/Molecular Structure and Spectra
Automatic control
Automatic frequency control
Detonation
Diamonds
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
Electric properties
Electrical conductivity
Electrical resistivity
Electron paramagnetic resonance
ELECTRON SPIN RESONANCE
Electrons
FREQUENCY CONTROL
KLYSTRONS
LANDE FACTOR
LINE WIDTHS
Microwave absorption
Microwave equipment
MICROWAVE RADIATION
NANOMATERIALS
NANOSCIENCE AND NANOTECHNOLOGY
Nanostructure
Physics
Physics and Astronomy
Powders (Particulate matter)
SPIN
TEMPERATURE RANGE 0273-0400 K
electron paramagnetic resonance
anisotropic conducting structure
nanodiamond powder
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Summary:We have used electron paramagnetic resonance (EPR) to study high-purity detonation nanodiamond (DND) powders at room temperature. In recording the EPR signal with g factor 2.00247 and line width 0.890 mT, with automatic frequency control locking the frequency of the microwave generator (klystron) to the frequency of the experimental cavity, we observed a change in the shape of the EPR signal from the DND powder due to formation of an anisotropic electrically conducting structure in the powder. The electrical conductivity of the DND sample is apparent in the Dysonian EPR lineshape (strongly asymmetric signal with g factor 2.00146 and line width 0.281 mT) together with an abrupt shift of the baseline at the time of resonant absorption, and in the decrease in the cavity Q due to nonresonant microwave absorption. The observed effect can be explained by transition of the DND powder from a dielectric state to a state with metallic conductivity, due to spin ordering in a preferred direction.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-018-0577-9