4. The term ‘Nanotechnology’ is derived from the
Greek word ‘nanos’ and ‘dwarf’
The prefix nano in the word ‘Nanotechnology’
mean billionth (1 x 10-9 m)
The design, characterization, production and
applications of structures, systems and devices by
controlling size and shape at 10-9 m scale or the
single –atomic level.
5. COMMON TERMS
Nanoparticles: The size of the particles which
ranges from 1-50 nm
Nanomaterials: materials having size less than
100 nm atleast in one dimension
Nanotube: Nanometer scale tube like structure
Nano manufacturing: methods for producing
nanostructures in reliable and commercially
viable ways
6. HOW DO WE SEE NANO PARTICLES ?
Scanning electron microscope and
transmission electron microscope are used
to see the Nanoparticles
8. Carbon nanotubes are allotropes of
carbon with a nanostructure having a
length-to-diameter ratio greater than
10,00,000. when graphite sheets are
rolled into a cylinder, their edges joined
and form carbon nanotubes i.e., carbon
nanotubes are extended tubes of rolled
graphite sheets.
11. SINGLE WALLED NANOTUBES
It consists of one tube of
graphite. It is one atom thick
having a diameter of 2 nm of
a length of 100 x 10-6 m.
Structure of single walled
CNT ‘s are:
Armchair structure
Zig – zag structure
Chiral structure
12. MULTI WALLED CARBON
NANOTUBES
It consists of multiple layers of graphite
rolled in on themselves to form a tube
shape.
13. MANUFACTURE OF CNT
PYROLYSIS
LASER EVAPORATION
CARBON ARC METHOD
CHEMICAL VAPOUR DEPOSITION
14. PROPERTIES OF CARBON
NANOTUBES
Carbon nanotubes are very strong and highly
flexible
Cnt’s withstand extreme strain and tension
It has very high electrical conductivity
It has very high thermal conductivity
CNT atoms are continously vibrating back and
forth
16. CNTs in storage devices
Detection of gases using CNT
CNT in integrated memory circuits
CNT as protective shields
Air and water filtration using CNT
CNT in ultra capacitor