Localization and Electrical Transport in Onion-Like Carbon Based Composites
Science article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Journal of Applied Physics
ISSN: 0021-8979
, E-ISSN: 1089-7550
|
| Output data |
Year: 2012,
Volume: 111,
Number: 10,
Pages: 103701-1 - 13701-6
Pages count
: 7
DOI:
10.1063/1.4714555
|
| Authors |
Macutkevic J.
1
,
Adomavičius R.
1
,
Krotkus A.
1
,
Banys J.
2
,
Kuznetsov V.
3
,
Moseenkov S.
3,4
,
Romanenko A.
5
,
Shenderova O.
6
|
| Affiliations |
| 1 |
Center for Physical Sciences and Technology, A. Gosˇtauto 11, LT-01108 Vilnius, Lithuania
|
| 2 |
Radiophysics department, Faculty of Physics, Vilnius University, Saule˙tekio Ave. 9, LT-10222,
Vilnius, Lithuania
|
| 3 |
Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk 630090, Russia
|
| 4 |
Department of Natural Sciences, Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia
|
| 5 |
Institute of Inorganic Chemistry SB RAS, Lavrentiev Ave. 3, Novosibirsk 630090, Russia
|
| 6 |
International Technology Center, Raleigh, North Carolina 27715, USA
|
|
Funding (3)
|
1
|
International Science and Technology Center
|
B-1708
|
|
2
|
Space and Naval Warfare Systems Command
|
66001-04-1-8933
|
|
3
|
Lithuanian Academy of Sciences
|
|
Electrical transport properties of onion-like carbon (OLC) based composites over a wide (20 Hz–4 THz) frequency range are reported. The dependencies of dc conductivity on temperature can be approximated by the Mott law for one-dimensional variable range hopping below 130 K and by the typical law for fluctuation induced tunneling within the range of 130–300 K. The critical frequency at low temperatures also decreases according to the Mott law for one-dimensional variable range hopping. It was demonstrated that OLC annealing temperature plays a high role on the dielectric and electrical properties of composites at low temperatures. In the terahertz frequency range, the main contribution to the complex electrical conductivity is due to the phonon contribution while the contribution from hopping conduction vanishes at these frequencies.