TY - JOUR
T1 - Microstructure analyses of metal-filled carbon nanotubes synthesized by microwave plasma-enhanced chemical vapor deposition
AU - Hayashi, Yasuhiko
AU - Tokunaga, Tomoharu
AU - Kaneko, Kenji
AU - Henley, Simon J.
AU - Stolojan, Vlad
AU - Carey, J. David
AU - Silva, S. R.P.
N1 - Funding Information:
Manuscript received January 27, 2006; revised May 1, 2006. This work was supported in part by the Nanotechnology Support Project of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, carried out at the Research Laboratory of High Voltage Electron Microscopy, Kyushu University, and in part by the Grant-in Aid for Scientific Research (Houga-16651065) of the MEXT. The work at the University of Surrey was supported in part by the EPSRC via a Portfolio Partnership and by the Carbon Based Electronics Program. The review of this paper was arranged by Associate Editor G. Ramanath.
PY - 2006/9
Y1 - 2006/9
N2 - Pd/Co-based metal-filled carbon nanotubes (MF-CNTs) were synthesized by a microwave plasma-enhanced chemical vapor deposition method using a bias-enhanced growth technique. Pd/Co-based MF-CNTs were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) electron energy loss spectroscopy (EELS), and Raman spectroscopy. MF-CNTs were well-aligned and uniform in size on a Si substrate. Both multiwall nanotube carbon nanotubes (CNTs) and herringbone (or stacked cups structure) structures were observed. High-resolution TEM revealed that MF-CNTs were composed of highly ordered graphite layers, and the elemental maps of EELS indicate that both Co and Pd metals are present inside the nanotubes. TEM results clearly showed that both Pd and Co metals were successfully encapsulated into the CNTs. We observed a low value for the Raman intensity ratio between D (1355 cm-1) and G (1590 cm-1) bands with no shift of the G-peak position and no broadening of the G-peak, indicative of high-quality Pd/Co-based MF-CNTs. Based on TEM characterization, we propose a description for the encapsulating mechanisms.
AB - Pd/Co-based metal-filled carbon nanotubes (MF-CNTs) were synthesized by a microwave plasma-enhanced chemical vapor deposition method using a bias-enhanced growth technique. Pd/Co-based MF-CNTs were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) electron energy loss spectroscopy (EELS), and Raman spectroscopy. MF-CNTs were well-aligned and uniform in size on a Si substrate. Both multiwall nanotube carbon nanotubes (CNTs) and herringbone (or stacked cups structure) structures were observed. High-resolution TEM revealed that MF-CNTs were composed of highly ordered graphite layers, and the elemental maps of EELS indicate that both Co and Pd metals are present inside the nanotubes. TEM results clearly showed that both Pd and Co metals were successfully encapsulated into the CNTs. We observed a low value for the Raman intensity ratio between D (1355 cm-1) and G (1590 cm-1) bands with no shift of the G-peak position and no broadening of the G-peak, indicative of high-quality Pd/Co-based MF-CNTs. Based on TEM characterization, we propose a description for the encapsulating mechanisms.
KW - Electron energy loss spectroscopy (EELS)
KW - Metal filled carbon nanotubes (CNTs)
KW - Microwave plasma-enhanced chemical vapor deposition (MP-CVD)
KW - Scanning electron microscopy (SEM)
KW - Transmission electron microscopy (TEM)
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U2 - 10.1109/TNANO.2006.880456
DO - 10.1109/TNANO.2006.880456
M3 - Article
AN - SCOPUS:33749009726
VL - 5
SP - 485
EP - 490
JO - IEEE Transactions on Nanotechnology
JF - IEEE Transactions on Nanotechnology
SN - 1536-125X
IS - 5
M1 - 1695946
ER -