| 1. |
- Morjan, I., et al.
(författare)
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Carbon nanotubes growth from C2H2 and C2H4/NH3 by catalytic LCVD on supported iron-carbon nanocomposites
- 2007
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Ingår i: Physica E: Low-Dimensional Systems and Nanostructures. - : Elsevier BV. - 1386-9477. ; 37:1-2, s. 26-33
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Tidskriftsartikel (refereegranskat)abstract
- We report about the synthesis of carbon nanotubes by catalytic LCVD (C-LCVD), using a CW CO2 laser and alternatively, C2H2/ C2H4/NH3 and C2H2/C2H4-containing gas mixtures. Different core-shell Fe-C nanocomposites (as synthesized and toluene extracted) were used employed as catalysts. The nanotubes grown from Fe-C residue demonstrate the lowest mean diameters. Prevalent curled and coiled morphologies are obtained for the CNTs grown in the presence of ammonia. (c) 2006 Elsevier B.V. All rights reserved.
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| 2. |
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| 3. |
- Kabir, Mohammad, 1974, et al.
(författare)
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Plasma-enhanced chemical vapour deposition growth of carbon nanotubes on different metal underlayers
- 2005
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Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 16, s. 458-466
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Tidskriftsartikel (refereegranskat)abstract
- One important requirement for future applications of carbon nanotube electronic devices is the ability to controllably grow carbon nanotubes on metal electrodes. Here we show that it is possible to grow small diameter (<10 nm) vertically aligned carbon nanotubes on different metal underlayers using plasma-enhanced chemical vapour deposition. A crucial component is the insertion of a thin silicon layer between the metal and the catalyst particle. The electrical integrity of the metal electrode layer after plasma treatment and the quality of the metals as interconnects are also investigated.
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| 4. |
- Lee, SangWook, et al.
(författare)
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A three-terminal carbon nanorelay
- 2004
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Ingår i: Nano letters. - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 4:10, s. 2027-2030
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Tidskriftsartikel (refereegranskat)abstract
- Three-terminal nanorelay structures were fabricated with multiwall carbon nanotubes (MWNTs). The nanotube relays were deflected by applying a gate voltage until contact (mechanical and/or electrical) was made with a drain electrode, thus closing the circuit. It was possible to achieve multiple switching cycles, showing that carbon nanotubes are suitable and practical systems for developing nanoelectromechanical devices of this kind.
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| 5. |
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| 6. |
- Morjan, Raluca Elena, 1976, et al.
(författare)
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High growth rates and wall decoration of carbon nanotubes grown by plasma-enhanced chemical vapour deposition
- 2004
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Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614. ; 383/4, s. 385-390
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- DC plasma-enhanced chemical vapour deposition (PECVD) was used to grow films of aligned carbon nanotubes on a silicon wafer using Fe as catalyst and a C2H2/H2 gas mixture. The films were of high quality and showed an exceptionally high growth rate compared with other plasma growth techniques. For long growth times, the upper parts of the nanotubes developed additional outer graphite flakes. The onset of the ‘tube decoration’ correlates with a decrease in linear growth rate and can be related to the gradient of plasma parameters in the cathode sheath.
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| 7. |
- Morjan, Raluca Elena, 1976, et al.
(författare)
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Selective growth of individual multiwalled carbon nanotubes
- 2004
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Ingår i: Current Applied Physics. - : Elsevier BV. - 1567-1739. ; 4:6, s. 591-594
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Tidskriftsartikel (refereegranskat)abstract
- Growth of individual, vertically aligned multiwalled carbon nanotubes (VACNT) on patterned Si wafers using dc plasma-enhanced CVD is described. The selective growth of individual VACNT within larger holes etched in Si is demonstrated for the first time.
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| 8. |
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| 9. |
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| 10. |
- Morjan, Raluca Elena, 1976
(författare)
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Towards Controlled Growth and Applications of Carbon Nanotubes
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis deals with growth, characterization and application of carbon nanotubes. The methods involved in the production of carbon nanotubes are thermal chemical vapor deposition (T-CVD) and plasma enhanced chemical vapor deposition (PE-CVD). Thermal-CVD has been successfully employed in synthesis of single wall carbon nanotubes (SWCNT) and multi wall carbon nanotubes (MWCNT). The understanding of the MWCNT growth was performed by studying the effects of influential parameters such as: carbon feedstock molec?les, size of catalytic iron (Fe) particles and temperature. A growth mechanism for MWCNT was proposed. Using the PE-CVD method we investigated the growth of MWCNT catalyzed by Fe and of vertically aligned carbon nanofibers (VACNFs) catalyzed by nickel (Ni). Using Fe as a catalyst, carbon nanotube carpet-like films were grown with exceptionally high growth rate. The selective growth of individual VANCFs within a hole etched in Si is demonstrated. The Ni catalyzed growth of VACNFs was investigated for different metal underlayers, namely: Pt, Pd, Ti, Mo, W and Cr. This study was carried out on continuous films and on patterned Ni dots. We observed that the Si/metal interaction occurring during growth plays a vital role in VACNFs formation on W, Mo, Pt and Pd metals. Structural and spectroscopic properties of the nanotube films were determined using electron microscopy (SEM and TEM) and Raman spectroscopy. All these results represents intermediate steps towards integration of MWCNT/ VACNFs into CNT-based devices. Making use of the thermal and electrical properties of carbon nanotubes, aligned MWCNT were tested in a microcooler channel device, while the VACNFs were involved in fabrication and measurement of nanoeletromechanical systems.
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