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Presented By :

G.Sushma

V.Nagarani

THE NEXT BIG THING IS VERY VERY SMALL THING



What IsNanotechnology ?



NANOTECHNOLOGY

Nanotechnology is the engineering of functionalsystems at the molecular scale.

Generally nanotechnology deals with structures of thesize 100 nanometres or smaller in at least onedimension, and involves developing materials or devices within that size.



How Small Is Nano Scale ?

One Nanometer (nm) ,Is one billionth of a metre or 10-9

of metre. One human hair (cross section) is about 100,000

nanometres.

Larger than nanoscale is microscale and smaller than the

atomic scale.



Approaches for building nanomaterials

Bottom-up: Materials and devices are built from

molecular components which assemble themselveschemically by principles of molecular recognition.

Top-down: Nano objects are constructed from largerentities without atomic-level control.



W hat makes nanotechnology

Interesting?

Gold nano particles appearing in different

colours at different particle sizes



History of nanotechnology«



History In 4th century A.D Roman glassmakers

were fabricating glasses containing nano

sized metals.

Richard Feynman in 1960 presentedlecture at the meeting of the American

physical society, entitled There is plenty of room at the bottom .



Applications of nanotechnology «



Applications Medicine

Space

Electronics Robotics

Magnetic resonance imaging (MR I).

IT

Bio Medicals



Medicine

CancerTreatment Adv ances UsingNanotechnology



Space Benefits

Improvement in shuttles

Benefits to the astronauts Cheaper space flights

Nano satellites



Nano electronics

Nanoelectronics refer to the use of nanotechnology on

electronic components, especially transistors. Although the term nanotechnology is generally defined as utilizing technology less than 100 nm insize, nano electronics often refer to transistor devices



CARBON NANOTUBE(CNTS) Carbon nanotubes are allotropes of carbon with

numerous outstanding properties. In simple words,

they are the strongest and stiffest materials known,and thus have many potential applications in varioustechnology/science fields

A carbon nanotube is a sheet of graphite rolled into a

tube with bonds at the end of the sheet forming thebonds that close the tube



Fabrication Process

Laser evaporation

Carbon arc method

Chemical vapour decomposition



Structure of CNTS



Carbonnanotube FET



Construction

of CNTFET

A CNTFET is theanalogue of siliconMOSFET in whichSWCNTS replacesthe siliconchannel, the first

crude devices.



Applications of CNT

Field emission and shielding

Computers

Fuel cells

Chemical sensors



Advantages ofCNT...



Conclusion...



Future scopes Furthermore, the perspectives for applications are very

challenging and exciting. The main avenues of potential

applications of carbon nanotubes are: ultimate reinforcement

fibers for composites (high strength, high aspect ratio, high

thermal and chemical stability); conducting nanowires; field

emitters (individual nanotube field emitters, large area flat

panel displays,); nanotools (tips for Scanning Tunneling,

Atomic Force, Magnetic Resonance Force and Scanning NearfieldO ptical, Chemical/Biological Force Microscope tips,

nanomanipulators, nanotweezers)



Thank you...



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