High-temperature microwave absorption and evolutionary behavior of multiwalled carbon nanotube nanocomposite

The high-temperature dielectric property and evolutionary behavior of multiwalled carbon nanotube/silica nanocomposite from 30 to 600 degrees C in the range 8.2-12.4 GHz were investigated. Both increasing temperature and elevated multiwalled carbon nanotube concentration are found to enhance complex permittivity, and a mechanism for this enhancement is also proposed. The calculated attenuation suggests that multiwalled carbon nanotubc/silica a good candidate for high-temperature microwave-absorbing materials, and this could help in material designs with matching conditions. Crown Copyright (C) 2009 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.