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OUTLINE

DESTRUCTIVE CONSTRUCTIONS OF NANOSTRUCTURES WITH CARBON NANOTUBES THROUGH NANOROBOTIC MANIPULATION. OUTLINE. Introduction Nanorobotic Manipulation System Selection of Individual Nanotubes Destructive Fabrication of Nano building blocks Cunstruction of Nanostructures using EBID Conclusion.

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OUTLINE

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  1. DESTRUCTIVE CONSTRUCTIONS OF NANOSTRUCTURES WITH CARBON NANOTUBES THROUGH NANOROBOTIC MANIPULATION

  2. OUTLINE • Introduction • Nanorobotic Manipulation System • Selection of Individual Nanotubes • Destructive Fabrication of Nano building blocks • Cunstruction of Nanostructures using EBID • Conclusion

  3. Carbon NanoTubes

  4. Directly applied to • Nano electro mechanical systems, nano electronics But in most cases -modifications are needed e.g.. An ideal AFM probe tip, biological electrode Destructive fabrication MWCNT is stretched and broken to obtain layered structure and sharpened structure

  5. Nanorobotics -Nanorobotics is concerned with interactions with atomic- and molecular-sized objects and is some times called Molecular Robotics. -Nanomanipulation is synonym with Nanorobot which is defined as positioning and/or orientation control of Nanometer scale objects with nanometer resolution

  6. Nanorobotic Manipulation System

  7. Selection of Nanotubes Procedures • Pre-select a nanotube or bundle by picking up from raw materials • Test the flexural rigidity of the pre selected one to determine whether it has desired properties • If it is so, select it, otherwise go for next pre-selection and repeat above step

  8. Pre selection of nanotubes

  9. Testing for flexural Rigidity

  10. Schematics for testing the flexural rigidity

  11. Formulae for finding the flexural rigidity

  12. Destructive Fabrication -Desired building blocks of MWNTs for nanostructures can be obtained by deforming or breaking a nanotube, which is defined as destructive fabrication -Here we will discuss 1)Plastic Deforming MWNTs 2)Breaking and Sharpening MWNTs 3Bearing Motion of MWNTs 4)Improved Lenth controlling by surface force Clamping

  13. Plastic deformation

  14. Kinked Junction after plastic deformation

  15. Elastic and Plastic deformations of a MWNT

  16. Fixing the Plastic deforamtion using EBID

  17. Breaking of MWNT

  18. MWNT before breaking

  19. MWNT after breaking

  20. Destructive fabrication for bearing using MWNT

  21. Construction of Nanostructures Using EBID • Electrons could be emitted from a cold metal surface in the presence of a strong electric field which is known as field emission • Electron Beam Induced Deposition is caused by the dissociation of molecules adsorbed to a surface by energy electrons • Here EBID provides a soldering effect

  22. Fixing the Junctions Using EBID

  23. Comparison of Connection strength connected through weak Vanderwaal forces(a) and EBID deposits

  24. Conclusion • Destructive construction using nanorobotic manipulator is a strategy to construct nanostructures and it is an effective way to obtain layered and/or sharpened structures of nanotubes for the application of nanobearing and probe tips • It is also possible for the manipulations of nanometer-order bio-objects. • Nanorobotic manipulation is more effective than nanoscale self assembly. This method does mot mean that nanorobotic manipulation can replace such technologies at least at present.

  25. References • Lixing Dong, Fumihito Arai, Toshio Fukuda.“Destructive Constructions of Nanostructures With carbon Nano tubes through NanoRobotic Manipulation” Jl.Mechatronics Vol.9,No.2, pp350-356.,September 2004. • Lixing Dong, Fumihito Arai, Toshio Fukuda.”electron beam induced deposition with carbon Nanotube emitters”Jl Applied Physics vol81, no.10, pp.1919-1921,2 september 2002. • D Baechi, R Buser and J Dual.”From micro- to nanoparticle manipulation” Jl.of Nanoparticle research2: 393-399, Kluwer accademic publishers Printed in the Netherlands.September 2000 • http://www-lmr.usc.edu/~lmr • http://en.wikipedia.org/wiki/Nanorobotics • Iwao Fujimasa. “Micromachines- A new era in Mechanical engineering” Oxford science publications.pp.118-119. • A chambers, R.K Fitch, B.S Halliday. “Basic Vacuum Technology” 2nd edition, Institute of Physics Publishing(IOP), Bristol and Philadelphia.pp.12-13.

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