1. NANOTECHNOLOGY

2. TOPICS
 INTRODUCTION
 COMMON TERMS
 CARBON NANO TUBES (CNT)
 STRUCTURES OF CNT
 MANUFACTURE OF CNT
 APPLICATIONS OF CNT

3. INTRODUCTION

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

7. CARBON NANOTUBES (CNT)

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.

9. STRUCTURES OF
CARBON NANOTUBES

10.  SINGLE WALLED NANOTUBES
 MULTI WALLED NANOTUBES

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

15. APPLICATIONS OF
CARBON NANOTUBES

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

17. THANK YOU