OAtube Nanotechnology 1, 1006 (2008)

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Information about OAtube Nanotechnology 1, 1006 (2008)
Science-Technology

Published on September 11, 2008

Author: oatube

Source: authorstream.com

Carbon nanotubes: optimized growth for applications and practical use of large CNT structures : Carbon nanotubes: optimized growth for applications and practical use of large CNT structures Robert Vajtai*, G. Toth, K. Kordas, X. H. An, P. M. Ajayan* *Department of Mechanical Engineering & Materials Science Rice University, Houston, Texas Outline : Very short introduction Carbon nanotube forest: the materials we deal with Experimental setup/Results on cooling: measurements and calculations Printed electronics made of carbon nanotubes Conclusions Outline Introduction : Introduction Carbon nanotubes are well-studied scientifically They have unique physical properties Real life applications are still hiding, waiting CNTs are not industrially used because of technological and economical reasons Outline : Introduction Carbon nanotube forest: the materials we deal with Experimental setup/Results on cooling: measurements and calculations Printed electronics made of carbon nanotubes Conclusions Outline Experimental setup for CVD : Experimental setup for CVD Substrates: Si, SiO2, MgO, V2O5Precursors: methane, ethylene, xylene Catalysts: Fe from ferrocene, Ni, Pd, Co-Ni Slide 6: Thin(?) film of aligned nanotubes Slide 7: Growth rate: 1 mm/hr Area: 8 x 2.5 cm2 Number of tubes: 8 x 1011 (800 billion) Film density: 0.17 g/cm3 (calculated) 0.16 g/cm3 (measured) Geometric properties of the film Fe content: 7.8% (weight) Prof. Cao Saturation in length and larger diameter : Saturation in length and larger diameter 30 min 120 min 300 min 600 min Dr. Li Longer tubes… : Longer tubes… Even longer tubes… : Even longer tubes… Inconel also works as a substrate : Inconel also works as a substrate S. Talapatra, R. Vajtai, P.M. Ajayan et al. Nature Nanotechnology, 1(2) 112–116 (2006) Well : Well Growth kinetics : Growth kinetics N. Halonen, K. Kordás, G. Tóth, P. M. Ajayan and R. Vajtai, J. Phys. Chem. C 112, 6723 (2008) Growth kinetics : Growth kinetics N. Halonen, K. Kordás, G. Tóth, P. M. Ajayan and R. Vajtai, J. Phys. Chem. C 112, 6723 (2008) Growth kinetics : Growth kinetics N. Halonen, K. Kordás, G. Tóth, P. M. Ajayan and R. Vajtai, J. Phys. Chem. C 112, 6723 (2008) Growth kinetics : Growth kinetics N. Halonen, K. Kordás, G. Tóth, P. M. Ajayan and R. Vajtai, J. Phys. Chem. C 112, 6723 (2008) Growth kinetics : Growth kinetics N. Halonen, K. Kordás, G. Tóth, P. M. Ajayan and R. Vajtai, J. Phys. Chem. C 112, 6723 (2008) Outline : Introduction Carbon nanotube forest: the materials we deal with Experimental setup/Results on cooling: measurements and calculations Printed electronics made of carbon nanotubes Conclusions Outline Chip cooling: problem to solve : Chip cooling: problem to solve Chip cooling is necessary Present methods do not work (sufficiently) CNTs are promising materials Still there are open scientific and engineering questions Preparation of the finned structure : Preparation of the finned structure K. Kordás, G. Tóth, R. Vajtai, P. M. Ajayan et al., Appl. Phys. Lett. 90, 123105 (2007) Mounting the cooler device : Mounting the cooler device K. Kordás, G. Tóth, R. Vajtai, P. M. Ajayan et al., Appl. Phys. Lett. 90, 123105 (2007) Experimental results : Experimental results Without coolant gas: ~0.3 W removed 30 W/cm2 ~1 kW/g nanotube With 2 l/min gas: ~1.1 W removed >100 W/cm2 >1 kW/g nanotube Comparison to copper : Comparison to copper K. Kordás, G. Tóth, R. Vajtai, P. M. Ajayan et al., Appl. Phys. Lett. 90, 123105 (2007) Cooler: Summary of properties : Cooler: Summary of properties The cooler increases surface area “intelligently” Can be mounted on Device Heat Spreader Active cooler Passive cooler No CTE matching problems occur Mechanically stabile in the 10-100 µm range, too Variable shapes are easy to grow and manufacture The structure has very small weight (several ten times less than similar sized metal structures) Outline : Introduction Carbon nanotube forest: the materials we deal with Experimental setup/Results on cooling: measurements and calculations Printed electronics made of carbon nanotubes Conclusions Outline Ink preparation : Ink preparation K. Kordás, G. Tóth, S. Kar, R. Vajtai, P. M. Ajayan et al., Small 2, 1021 (2006) Slide 27: Nanotube Structures Printed on Paper The printed structure can be a flexible antenna or simply a wire to connect electrical parts K. Kordás, G. Tóth, S. Kar, R. Vajtai, P. M. Ajayan et al., Small 2, 1021 (2006) Printing results on alumina template : Printing results on alumina template T. Mustonen, K. Kordás, G. Tóth, P. M. Ajayan, R. Vajtai et al., Phys. Rev. B 77, 125430 (2008) Slide 29: Printing results on alumina template Silicon substrate: results : Silicon substrate: results Sensor properties : Sensor properties Outline : Introduction Carbon nanotube forest: the materials we deal with Experimental setup/Results on cooling: measurements and calculations Printed electronics made of carbon nanotubes Conclusions Outline Conclusions : Conclusions Large carbon nanotube structures have application potential They have unique synergetic thermal and electrical properties Large amount of nanotubes is not more expensive; on the contrary, it can be more economic to deal with them than building devices from individual CNTs Acknowledgements : Acknowledgements Profs. T. Borca-Tasciuc, S. Talapatra, A.Y. Cao Drs. S. Pal, L. Ci, X. Li Interconnect Focus Center, NYSTAR NSEC (DMR-0642573) Slide 35: Thanks to the organizers for the invitation THANK YOU for your attention Please feel free to contact me for more information:Robert.Vajtai at rice.edu

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