In this letter, we report the catalytic synthesis of a large amount of straight carbon nanotubes using a transition-metal cobalt–nickel/zeolite catalyst. High-resolution transmission electron microscopy images show that they are well graphitized. Raman spectrum shows its peak at 1349 cm−1 (D band) is much weaker than that at 1582 cm−1 (G band). We believe that straight carbon nanotubes contain much less defects than curved nanotubes and might have potential applications in the future.
REFERENCES
1.
2.
V. P.
Dravid
, X.
Lin
, Y.
Wang
, X. K.
Wang
, A.
Yee
, J. B.
Ketterson
, and R. P. H.
Chang
, Science
259
, 1601
(1993
).3.
4.
R. E. Smally, Proceedings of the Robert A. Welch Foundation Conference on Chemical Research XXXVI, Oct. 26–27, 1992 (Robert A. Welch Found., Houston, TX 1992), p. 161.
5.
M. R.
Pederson
and J. Q.
Broughton
, Phys. Rev. Lett.
69
, 2689
(1992
).6.
J. W.
Mintmire
, B. I.
Dunlap
, and C. T.
White
, Phys. Rev. Lett.
68
, 631
(1992
).7.
N.
Hamada
, S.
Sawada
, and A.
Oshiyama
, Phys. Rev. Lett.
68
, 1579
(1992
).8.
9.
J. W.
Mintmire
, D. H.
Robertson
, and C. T.
White
, J. Phys. Chem. Solids
54
, 1835
(1993
).10.
R.
Saito
, M.
Fujita
, G.
Dresselhaus
, and M. S.
Dresselhaus
, Appl. Phys. Lett.
60
, 2204
(1992
).11.
R.
Saito
, M.
Fujita
, G.
Dresselhaus
, and M. S.
Dresselhaus
, Phys. Rev. B
46
, 1804
(1992
).12.
L.
Chico
, V. H.
Creapi
, L. X.
Benedict
, S. G.
Louie
, and M. L.
Cohen
, Phys. Rev. Lett.
76
, 971
(1996
).13.
Research Group of Molecular Sieves, Dalian Institute of Physical, Academia Sinica, Zeolite Molecular Sieves (in Chinese) (Academic, Beijing, 1978), p. 168.
14.
K.
Hernadi
, A.
Fonceca
, J. B.
Nagy
, D.
Bernaerts
, A.
Fudala
, A. A.
Lucas
, Zeolites
17
, 416
(1996
).15.
D. R. Strong and C. A. Somorjai, in Catalytic Ammonia Synthesis, edited by J. R. Jennings (Plenum, New York, 1991), p. 133.
16.
W. Z.
Li
, S. S.
Xie
, L. X.
Qian
, B. H.
Chang
, B. S.
Zou
, W. Y.
Zhou
, R. A.
Zhao
, and G.
Wang
, Science
274
, 1701
(1996
).17.
V.
Ivanov
, J. B.
Nagy
, Ph.
Lambin
, A.
Lucas
, X. B.
Zhang
, X. F.
Zhang
, D.
Bernaerts
, G.
Van Tendeloo
, S.
Amelinckx
, and J.
Van Lauduyt
, Chem. Phys. Lett.
223
, 329
(1994
).18.
S.
Amelinckx
, X. B.
Zhang
, and D.
Bernaerts
, Science
265
, 635
(1994
).19.
S. S.
Xie
, W. Z.
Li
, C. Y.
Wang
, L. W.
Xu
, H.
Zhang
, Y.
Zhang
, and L. X.
Qian
, Sci. China A
40
, 971
(1997
).20.
R.
Tsu
, J. H.
Gonzalez
, and I. C.
Hernandez
, Solid State Commun.
27
, 507
(1978
).
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