This document discusses carbon nanotubes, their properties, synthesis, and applications in electronic devices. It describes that carbon nanotubes are cylindrical structures made of rolled graphene sheets that are only a few nanometers in width but can be many microns in length. They exist as single-walled nanotubes or multi-walled nanotubes. The document outlines different methods for synthesizing carbon nanotubes and reviews their applications, including uses in transparent conductive films, printable transistors, field emission, integrated circuits, fibers, and paper batteries. In conclusion, it states that carbon nanotubes are poised to replace silicon in miniaturizing electronic circuits and pushing beyond the theoretical limits of silicon transistors.

1. CARBON NANOTUBES:
Properties, Synthesis & Applications
in Electronic Devices

2.  Chemical Element
 Physical forms
 Covalently bonded n/w
 Allotropes
 Physical Properties :
Transparent/Opaque
Hard/Soft
Thermal Conductivity
Electrical Conductivity

3. NANOTUBE:
Nanometer scale Tube-like
Structure.
Well structured network of
Hexagon atoms that connect
together in a rolled fashion that
creates a cylinder without a
seam.
Width- 1nm
Length – Depending on
requirements (can be few nm,
thousands of microns, or ten
thousands of microns).

4. CARBON NANOTUBES (CNTs):
Wires of pure carbon with
nm(10-9) diameters and lengths
of many microns.
Types : SWCNT & MWCNT
SWCNT : Single atomic layer
thick sheet of
graphite rolled into a
seamless cylinder.
MWCNT : Several concentric
Nanotube Shells.

5. Prof. Sumio Iijima, IBM. Japan
HISTORY
Initial History of Nanotubes
started in 1970 with preparation
of carbon filaments but it failed
to meet the requirements for
width and thus were deemed.
In 1991, the true first invention
of nanotube was finally made.
CNT was discovered by
Professor Sumio Iijima of IBM in
Japan.

6. STRUCTURE OF CNTs
Depends on rolling up the graphene
sheet.
3 Geometries: Armchair
Zigzag
Chiral.
 Also referred as Flavors.

7. PROPERTIES OF CNTs

8. ELECTRONIC PROPERTIES OF CNTs:
Understanding electronic properties of
a graphene sheet.
Most Directions: there is a bandgap
electrons are not free
Graphene: zero-gap semiconductor.
Special Directions: electrons flow easily
Graphene: metallic
Bulk Graphite: conducting metallic path
which connects any two
points.
Graphite: conducts electricity.
Rolled up
Special direction: along the axis of NT.
Directions: Metallic
Semiconducting
Molecular Electronic Technologies.

9. SYNTHESIS METHODS FOR CARBON NANOTUBES
1) ARC DISCHARGE CHAMBER 2) LASER ABLATION METHOD
3) CHEMICAL VAPOR DEPOSITION (CVD) 4) HYDROCARBON FLAMES METHOD

10. CNT APPLICATIONS IN ELECTRONIC DEVICES
1) Transparent Conductive Films:
UNDER ELECTRON MICROSCOPE TOUCH SCREENS
PLASTIC SOLAR CELL
OLED LIGHTING
FLAT PANEL DISPLAY SCREEN

11. 2) Printable Transistors:
WAFER OF CNT TRANSISTORS

12. 3) Field Emission:
4) Integrated Circuits:

13. 5) CNT Fibers: 6) CNT Paper Battery

14. Carbon Nanotubes are the next step in Miniaturizing
Electronic Circuits, Replacing Silicon Transistors and
Diodes, which are fast reaching the Theoretical limits
of Size and Speed of Operation.

15. THANK YOU
-GARGI