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Conformal metal oxide coatings on nanotubes by direct low temperature metal-organic pyrolysis in supercritical carbon dioxide
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10.1116/1.2917072
/content/avs/journal/jvstb/26/3/10.1116/1.2917072
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/26/3/10.1116/1.2917072
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Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the experiment apparatus. Power cable was used to provide electricity for cartridge heaters in the heating block. The temperatures of sample and solution were individually heated by different heaters and controlled by using different thermocouples. The inner volume of the reactor is around 110 ml.

Image of FIG. 2.
FIG. 2.

AES spectrum of untreated pristine MWCNTs (top spectrum) grown by catalytic chemical vapor deposition process at , with Fe (10 nm) as the catalyst on thermally grown silicon oxide. Gallium oxide coated MWCNTs (bottom spectrum) fabricated by thermal decomposition of in process at , 28–32 MPa for 10 min.

Image of FIG. 3.
FIG. 3.

(a) FESEM image of untreated pristine MWCNTs. The diameters of the pristine MWCNTs are in the range of 20–60 nm. (b) FESEM image of gallium oxide coated MWCNTs. The gallium oxide coating was deposited by thermal decomposition of in process at , 28–32 MPa for 10 min. The diameters of the coated MWCNTs are in the range of 70–130 nm, which indicates that the average thickness of the gallium oxide coating is around 30 nm for 10 min.

Image of FIG. 4.
FIG. 4.

(a) TEM image of a single pristine MWCNT. (b) TEM image of MWCNTs coated by gallium oxide from thermal decomposition of at and 23–24 MPa for 7 min. The arrow inside (b) shows the part of MWCNTs having no oxide coating. (c) TEM image of MWCNTs coated by gallium oxide from thermal decomposition of at and 28 MPa for 1.5 min. (d) Higher magnification TEM image of MWCNTs coated by gallium oxide from thermal decomposition of at and 28 MPa for 1.5 min. (e) A typical EDS spectrum of oxide coated MWCNTs. The gallium oxide deposition experiment was carried out at , 28–32 MPa for 1.5 min. The Ga and majority O peaks result from the gallium oxide coating, and the major carbon signal is ascribed to the MWCNTs with some contribution from carbon impurities and adventitious carbon. The tiny Cu peak is from the TEM grid.

Image of FIG. 5.
FIG. 5.

(a) FESEM image of untreated pristine MWCNTs. The diameters of the MWCNTs are in the range of 10–30 nm. (b) FESEM image of MWCNTs coated by gallium oxide from pyrolysis of at , 28–30 MPa for 10 min. The diameters of the MWCNTs are in the range of 60–100 nm. The arrow in (b) indicates that the coating of gallium oxide can replicate the small helix feature of MWCNTs. (c) FESEM image of gallium oxide coated MWCNTs with relatively uniform Ru coating on the surface by atomic layer deposition from reaction between and at for 150 cycles. (d) A typical EDS spectrum of oxide coated MWCNTs with Ru ALD coating. The significant Ru peak is shown. The peak of Ga and O come from the gallium oxide under the Ru, and the tiny C peak probably comes from the CNT core, the adventitious carbon from air, and the as-deposited films.

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/content/avs/journal/jvstb/26/3/10.1116/1.2917072
2008-05-07
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Conformal metal oxide coatings on nanotubes by direct low temperature metal-organic pyrolysis in supercritical carbon dioxide
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/26/3/10.1116/1.2917072
10.1116/1.2917072
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