In multiwall carbon nanotube (MWNT)—polystyrene (PS) composites, a weak temperature dependence of conductivity has been observed at a percolation threshold of . The power law behavior indicates metallic-like behavior, unlike the usual activated transport for systems near the percolation threshold. The low field positive magnetoconductance follows dependence, due to the weak localization in disordered metallic systems. The marginal metallic nature of MWNT-PS at percolation threshold is further verified from the negligible frequency dependence of conductivity, in the temperature range of 300 to 5 K.
REFERENCES
1.
H. M.
Kim
, M. -S.
Choi
, J.
Joo
, S. J.
Cho
, and H. S.
Yoon
, Phys. Rev. B
74
, 054202
(2006
).2.
J. M.
Benoit
, B.
Corraze
, and O.
Chauvet
, Phys. Rev. B
65
, 241405
(2002
).3.
P.
Sheng
, E. K.
Sichel
, and J. I.
Gittleman
, Phys. Rev. Lett.
40
, 1197
(1978
).4.
V.
Augelli
, T.
Lignozo
, M. C.
Masellis
, M. F.
Mascarella
, L.
Schiavulli
, and A.
Valentini
, J. Appl. Phys.
90
, 1362
(2001
).5.
M.
Reghu
, C. O.
Yoon
, C. Y.
Yang
, D.
Moses
, P.
Smith
, A. J.
Heeger
, and Y.
Cao
, Phys. Rev. B
50
, 13931
(1994
).6.
R.
Ramasubramaniam
, J.
Chen
, and H.
Liu
, Appl. Phys. Lett.
83
, 2928
(2003
).7.
E.
Kymakis
and G. A. J.
Amaratunga
, J. Appl. Phys.
99
, 084302
(2006
).8.
M. P.
Anantram
, and F.
L’eonard
, Rep. Prog. Phys.
69
, 507
(2006
).9.
R.
Bhatia
and V.
Prasad
, Solid State Commun.
150
, 311
(2010
).10.
11.
12.
B. I.
Shklovskii
and A. L.
Efros
, Electronic Properties of Doped Semiconductors
(Springer
, Berlin
, 1979
).13.
P. K.
Choudhury
, M.
Jaiswal
, and R.
Menon
, Phys. Rev. B
76
, 235432
(2007
).14.
J.
Vavro
, J. M.
Kikkawa
, and J. E.
Fischer
, Phys. Rev. B
71
, 155410
(2005
).15.
A. R.
Long
, Adv. Phys.
31
, 553
(1982
).16.
S. R.
Elliott
, Adv. Phys.
36
, 135
(1987
).17.
B. E.
Kilbride
, J. N.
Coleman
, J.
Fraysse
, P.
Fournet
, M.
Cadek
, A.
Drury
, S.
Hutzler
, S.
Roth
, and W. J.
Blau
, J. Appl. Phys.
92
, 4024
(2002
).18.
C. S.
Suchand Sangeeth
, M.
Jaiswal
, and R.
Menon
, J. Phys.: Condens. Matter
21
, 072101
(2009
).© 2010 American Institute of Physics.
2010
American Institute of Physics
You do not currently have access to this content.
