DESTRUCTIVE DESTRUCTIVE CONSTRUCTIONS OF CONSTRUCTIONS OF NANOSTRUCTURES NANOSTRUCTURES

WITH WITH CARBON NANOTUBES CARBON NANOTUBES

THROUGH NANOROBOTIC THROUGH NANOROBOTIC MANIPULATIONMANIPULATION

OUTLINEOUTLINE

IntroductionIntroduction Nanorobotic Manipulation SystemNanorobotic Manipulation System Selection of Individual NanotubesSelection of Individual Nanotubes Destructive Fabrication of Nano building Destructive Fabrication of Nano building

blocksblocks Cunstruction of Nanostructures using EBIDCunstruction of Nanostructures using EBID ConclusionConclusion

Carbon NanoTubesCarbon NanoTubes

Directly applied toDirectly applied to- Nano electro mechanical systems, nano Nano electro mechanical systems, nano

electronicselectronics

But in most casesBut in most cases

-modifications are needed-modifications are needed

e.g.. An ideal AFM probe tip,e.g.. An ideal AFM probe tip,

biological electrodebiological electrode

Destructive fabricationDestructive fabrication

MWCNT is stretched and broken to MWCNT is stretched and broken to obtain layered structure and obtain layered structure and

sharpened structure sharpened structure

NanoroboticsNanorobotics

-Nanorobotics is concerned with interactions -Nanorobotics is concerned with interactions with atomic- and molecular-sized objects with atomic- and molecular-sized objects and is some times called Molecular and is some times called Molecular Robotics.Robotics.

-Nanomanipulation is synonym with -Nanomanipulation is synonym with Nanorobot whichNanorobot which is defined as positioning is defined as positioning and/or orientation control of Nanometer and/or orientation control of Nanometer scale objects with nanometer resolution scale objects with nanometer resolution

Nanorobotic Manipulation Nanorobotic Manipulation SystemSystem

Selection of NanotubesSelection of Nanotubes

ProceduresProcedures

1)1) Pre-select a nanotube or bundle by picking Pre-select a nanotube or bundle by picking up from raw materialsup from raw materials

2)2) Test the flexural rigidity of the pre Test the flexural rigidity of the pre selected one to determine whether it has selected one to determine whether it has desired propertiesdesired properties

3)3) If it is so, select it, otherwise go for next If it is so, select it, otherwise go for next pre-selection and repeat above steppre-selection and repeat above step

Pre selection of nanotubes

Testing for flexural Rigidity

Schematics for testing the flexural rigidity

Formulae for finding the flexural rigidity

Destructive FabricationDestructive Fabrication

-Desired building blocks of MWNTs for -Desired building blocks of MWNTs for nanostructures can be obtained by deforming or nanostructures can be obtained by deforming or breaking a nanotube, which is defined as breaking a nanotube, which is defined as destructive fabricationdestructive fabrication

-Here we will discuss-Here we will discuss 1)Plastic Deforming MWNTs1)Plastic Deforming MWNTs 2)Breaking and Sharpening MWNTs2)Breaking and Sharpening MWNTs 3Bearing Motion of MWNTs3Bearing Motion of MWNTs 4)Improved Lenth controlling by surface 4)Improved Lenth controlling by surface

force Clamping force Clamping

Plastic deformation

Kinked Junction after plastic deformation

Elastic and Plastic deformations of a MWNTElastic and Plastic deformations of a MWNT

Fixing the Plastic deforamtion using EBID

Breaking of MWNT

MWNT before breaking

MWNT after breaking

Destructive fabrication for bearing using MWNT

Construction of Nanostructures Construction of Nanostructures Using EBIDUsing EBID

Electrons could be emitted from a cold Electrons could be emitted from a cold metal surface in the presence of a strong metal surface in the presence of a strong electric field which is known as field electric field which is known as field emissionemission

Electron Beam Induced Deposition is Electron Beam Induced Deposition is caused by the dissociation of molecules caused by the dissociation of molecules adsorbed to a surface by energy electronsadsorbed to a surface by energy electrons

Here EBID provides a soldering effectHere EBID provides a soldering effect

Fixing the Junctions Using EBID

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

ConclusionConclusion Destructive construction using nanorobotic Destructive construction using nanorobotic

manipulator is a strategy to construct manipulator is a strategy to construct nanostructures and it is an effective way to obtain nanostructures and it is an effective way to obtain layered and/or sharpened structures of nanotubes layered and/or sharpened structures of nanotubes for the application of nanobearing and probe tipsfor the application of nanobearing and probe tips

It is also possible for the manipulations of It is also possible for the manipulations of nanometer-order bio-objects.nanometer-order bio-objects.

Nanorobotic manipulation is more effective than Nanorobotic manipulation is more effective than nanoscale self assembly. This method does mot nanoscale self assembly. This method does mot mean that nanorobotic manipulation can replace mean that nanorobotic manipulation can replace such technologies at least at present.such technologies at least at present.

ReferencesReferences

Lixing Dong, Fumihito Arai, Toshio Fukuda.“Destructive Constructions of Lixing Dong, Fumihito Arai, Toshio Fukuda.“Destructive Constructions of Nanostructures With carbon Nano tubes through NanoRobotic Nanostructures With carbon Nano tubes through NanoRobotic Manipulation” Manipulation” JlJl.Mechatronics Vol.9,No.2, pp350-356.,September 2004..Mechatronics Vol.9,No.2, pp350-356.,September 2004.

Lixing Dong, Fumihito Arai, Toshio Fukuda.”electron beam induced Lixing Dong, Fumihito Arai, Toshio Fukuda.”electron beam induced deposition with carbon Nanotube emitters”deposition with carbon Nanotube emitters”JlJl Applied Physics vol81, no.10, Applied Physics vol81, no.10, pp.1919-1921,2 september 2002.pp.1919-1921,2 september 2002.

D Baechi, R Buser and J Dual.”From micro- to nanoparticle manipulation” D Baechi, R Buser and J Dual.”From micro- to nanoparticle manipulation” Jl.Jl.of Nanoparticle research2: 393-399, Kluwer accademic publishers Printed of Nanoparticle research2: 393-399, Kluwer accademic publishers Printed in the Netherlands.September 2000in the Netherlands.September 2000

http://www-lmr.usc.edu/~lmrhttp://www-lmr.usc.edu/~lmr http://en.wikipedia.org/wiki/Nanoroboticshttp://en.wikipedia.org/wiki/Nanorobotics Iwao Fujimasa. “Micromachines- A new era in Mechanical engineering” Iwao Fujimasa. “Micromachines- A new era in Mechanical engineering”

Oxford science publications.pp.118-119.Oxford science publications.pp.118-119. A chambers, R.K Fitch, B.S Halliday. “Basic Vacuum Technology”A chambers, R.K Fitch, B.S Halliday. “Basic Vacuum Technology” 22ndnd edition, Institute of Physics Publishing(IOP), Bristol and edition, Institute of Physics Publishing(IOP), Bristol and

Philadelphia.pp.12-13.Philadelphia.pp.12-13.