Premium
Dielectric properties of onion‐like carbon and detonation nanodiamond/polydimethysiloxane composites
Author(s) -
Macutkevic Jan,
Banys Juras,
Moseenkov Sergey,
Kuznetsov Vladimir,
Nunn Nicholas,
Shenderova Olga
Publication year - 2015
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.23119
Subject(s) - materials science , percolation threshold , composite material , nanodiamond , dielectric , percolation (cognitive psychology) , detonation , explosive material , diamond , electrical resistivity and conductivity , chemistry , optoelectronics , organic chemistry , neuroscience , electrical engineering , biology , engineering
Results of dielectric investigations of onion‐like carbon (OLC) and detonation nanodiamond (DND)/polydimethysiloxane composites in wide frequency (20 Hz–3 THz) and temperatures (26–300 K) ranges are presented. The percolation threshold in OLC composites is 6.8 vol%. Electrical conduction in the OLC composites above the percolation threshold occurs mainly due to electron tunneling between OLC clusters and quasi‐one‐dimensional hopping inside the clusters. Hopping almost vanishes at frequencies above 100 GHz, where phonon contribution to the dielectric permittivity dominates. At low concentrations of nanocarbon particles (concentrations below the percolation threshold for OLC), the dielectric properties of the OLC and DND composites are similar. However, DNDs provide a noticeable improvement of the mechanical properties of the composites, in contrast with OLC. Therefore, a combination of the two nanomaterials in the composites could be beneficial. POLYM. COMPOS., 36:2084–2092, 2015. © 2014 Society of Plastics Engineer