Hydrogen-terminated detonation nanodiamond: impedance spectroscopy and thermal stability studies

She Su, Jiangling Li, Vojtěch Kundrát, Andrew M. Abbot, Haitao Ye

Research output: Contribution to journalArticle

Abstract

In this paper, we investigated the effect of hydrogen termination on the electrical properties and impedance spectra of detonation nanodiamond. The impedance spectra revealed that the hydrogen-termination process increases the electrical conductivity by four orders of magnitude at room temperature. An equivalent circuit has been proposed to correlate with the conduction mechanism. Arrhenius plot showed that there were two different activation energy levels located at 0.089 eV and 0.63 eV between 50 °C and 400 °C. The possible physical mechanism corresponding to these activation energy levels has been discussed. Hydrogen-terminated detonation nanodiamond has been further annealed at different temperatures prior to FTIR and XPS measurements in order to understand their thermal stability. The results demonstrated that the surface oxidization occurred between 100 °C and 150 °C. However, the C-H bonds could partially survive when the temperature reaches 400 °C in air.
Original languageEnglish
Article number023707
Number of pages9
JournalJournal of Applied Physics
Volume113
Issue number2
DOIs
Publication statusPublished - 14 Jan 2013

Bibliographical note

© 2013 American Institute of Physics.

Funding: EPSRC (EP/H034269/1).

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