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-type carbon nanotube by alkaline-earth metal Sr doping
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10.1063/1.2913170
/content/aip/journal/jap/103/9/10.1063/1.2913170
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/9/10.1063/1.2913170
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Figures

Image of FIG. 1.
FIG. 1.

Sample characterization by TEM and EDX (a) TEM image of the C-MWNT. (b) Sr is not uniformly doped in MWNT. (c) Sr is crystallized in MWNT. EDX analysis indicates that the doped material on MWNT is strontium, as shown in the inset.

Image of FIG. 2.
FIG. 2.

Raman spectroscopy. The peak increases while peak decreases with the change of samples, which indicates that the defects become developed from pristine MWNT (black line) to C-MWNT (blank squares) and finally to Sr-MWNT (dotted line).

Image of FIG. 3.
FIG. 3.

(a) The ratio of for pristine and Sr-MWNT and (b) the temperature-dependent TEP. The TEP of pristine MWNT (blank squares) has positive and large value. However, small and negative TEP is shown in case of Sr-MWNT (blank circles).

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/content/aip/journal/jap/103/9/10.1063/1.2913170
2008-05-06
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: N-type carbon nanotube by alkaline-earth metal Sr doping
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/9/10.1063/1.2913170
10.1063/1.2913170
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