NANOTECHNOLOGY

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

INTRODUCTION

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.

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

HOW DO WE SEE NANO PARTICLES ?

Scanning electron microscope and transmission electron microscope are used to see the Nanoparticles

CARBON NANOTUBES (CNT)

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.

STRUCTURES OF CARBON NANOTUBES

SINGLE WALLED NANOTUBES

MULTI WALLED NANOTUBES

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

MULTI WALLED CARBON NANOTUBES

It consists of multiple layers of graphite rolled in on themselves to form a tube shape.

MANUFACTURE OF CNT

PYROLYSIS LASER EVAPORATION CARBON ARC METHOD CHEMICAL VAPOUR DEPOSITION

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

APPLICATIONS OF CARBON NANOTUBES

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

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