This document discusses nanotechnology and carbon nanotubes (CNTs). It defines nanotechnology as working at the nanoscale of 1-100 nm. CNTs are allotropes of carbon that are cylindrical in shape with a diameter of 2 nm or less. There are two main types of CNTs - single-walled CNTs which are one atom thick, and multi-walled CNTs which contain multiple graphite layers. CNTs are manufactured using methods like pyrolysis, laser evaporation, and chemical vapor deposition. They have excellent mechanical and electrical properties and are being researched for applications in electronics, energy storage, filtration and other areas.

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