5. Nano Technology

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S.A ENGINEERING COLLEGE Ponamallee-Avadi road, Thiruverkadu,

Chennai.

PAPER PRESENTATION ON

PREPARED BY:

R.M.Manu 3rdYr E.C.E EMAIL ID:[email protected]

R.Divya 3rdYr E.E.E EMAIL ID:[email protected]



ABSTRACT ABSTRACT

Nanotechnology if well defined would simplyNanotechnology if well defined would simplymean what a particle could do when itsmean what a particle could do when itsreduced to a size of 10reduced to a size of 10--9m which is9m which is

nothing but the nanoscalenothing but the nanoscale

The technology deals with concepts ofThe technology deals with concepts ofquantum physics applied over nanoscalequantum physics applied over nanoscale

and hence increase the efficiency of theand hence increase the efficiency of thecomponents generated using thiscomponents generated using thistechnologytechnology



INTRODUCTION TO THE WORLD OFNANO-TECHNOLOGY

Nanotechnology is the engineering of functional systems at themolecular scale. This covers both current work and concepts that are moreadvanced

What is Nanotechnology?



HOW DOES NANOTECHNOLOGY WORK?

A nanometer (nm) is one-billionth of a meter, smaller thanthe wavelength of visible light and a hundred-thousandth the width of a

human hair.



THE ROLE OF QUANTUM THE ROLE OF QUANTUM

PHYSICS ON NANOPARTICLESPHYSICS ON NANOPARTICLES The rules of quantum mechanics are very different from classical The rules of quantum mechanics are very different from classical

physics, which means that the behavior of substances at thephysics, which means that the behavior of substances at thenanoscale can sometimes contradict common sense by behaving nanoscale can sometimes contradict common sense by behaving erratically.erratically.

For example.For example.

You can't walk up to a wall and immediately teleport to the other You can't walk up to a wall and immediately teleport to the otherside of it, but at the nanoscale an electron canside of it, but at the nanoscale an electron can ---- it's calledit's calledelectron tunnelingelectron tunneling..

Substances that areSubstances that are insulatorsinsulators, meaning they can't carry an, meaning they can't carry anelectric charge, in bulk form might become semiconductorselectric charge, in bulk form might become semiconductors when reduced to the nanoscale. when reduced to the nanoscale.

Melting points can change due to an increase in surface areaMelting points can change due to an increase in surface area



NANOWIRES AND NANONANOWIRES AND NANO

CARBONTUBESCARBONTUBES Nanowires are wires with a very small diameter,Nanowires are wires with a very small diameter,

sometimes as small as 1 nanometer.sometimes as small as 1 nanometer.

A carbon nanotube is a nano A carbon nanotube is a nano--size cylinder of carbonsize cylinder of carbonatoms.atoms.

Imagine a sheet of carbon atoms, which would look likeImagine a sheet of carbon atoms, which would look likea sheet of hexagons. If you roll that sheet into a tube,a sheet of hexagons. If you roll that sheet into a tube,you'd have a carbon nanotube.you'd have a carbon nanotube.

Carbon nanotube properties depend on how you roll theCarbon nanotube properties depend on how you roll the

sheet.sheet. In other words, even though all carbon nanotubes areIn other words, even though all carbon nanotubes are

made of carbon, they can be very different from onemade of carbon, they can be very different from oneanother based on how you align the individual atoms.another based on how you align the individual atoms.



TOOLS TO MAKE TOOLS TO MAKE

NANOSTRUCTURES«.NANOSTRUCTURES«.

Top Top--Down ApproachDown Approach

BottomBottom--Up approachUp approach



It mainly consist of :It mainly consist of :

Scanning probe instrumentsScanning probe instruments

Nanoscale LithographyNanoscale Lithography

Dip Pen NanolithographyDip Pen Nanolithography EE--Beam LithographyBeam Lithography

Nanosphere Liftoff LithographyNanosphere Liftoff Lithography

Self Self--AssemblyAssembly Nanoscale Crystal GrowthNanoscale Crystal Growth



FUTURE APPLICATIONSFUTURE APPLICATIONS

The application of Nanotechnology in future are expected to be in The application of Nanotechnology in future are expected to be inthe areas of:the areas of:

MedicineMedicine

EnvironmentalEnvironmental RoboticsRobotics

Nano ElectronicsNano Electronics

Material InnovationsMaterial Innovations

PharmaceuticalsPharmaceuticals

IT fieldIT field



Many of the concepts that Nanotechnology presents may look impossiblenow but they may not be so far away. Nanotechnology is nearer than we canthink. The Nano storm will catch us quietly. The only difference being that it willcome in a silent subdued manner much like how we used and embraced artificialfibres over the years without knowing it & it will make a tremendous impact onour lives.

CONCLUSION



REFERENCES Nanotechnology ± The Next Big Idea By

Mark Ratner and

Daniel Ratner Digit November 2001



BIBLIOGRAPHY: www.google.com

www.howstuffworks.com

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5. Nano Technology