carbon nanotubes - seminar iete
DESCRIPTION
Institution of Electronics and Telecommunication Engineers By Gargi KapadiaTRANSCRIPT
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CARBON NANOTUBES: Properties, Synthesis &
Applications in Electronic Devices
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Chemical Element Physical forms Covalently bonded n/w Allotropes Physical Properties : Transparent/Opaque Hard/Soft Thermal Conductivity Electrical Conductivity
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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).
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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.
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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.
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STRUCTURE OF CNTs
Depends on rolling up the graphene sheet.
3 Geometries: Armchair Zigzag Chiral.
Also referred as Flavors.
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PROPERTIES OF CNTs
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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 upSpecial direction: along the axis of NT.Directions: Metallic SemiconductingMolecular Electronic Technologies.
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SYNTHESIS METHODS FOR CARBON NANOTUBES
1) ARC DISCHARGE CHAMBER 2) LASER ABLATION METHOD
3) CHEMICAL VAPOR DEPOSITION (CVD) 4) HYDROCARBON FLAMES METHOD
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CNT APPLICATIONS IN ELECTRONIC DEVICES1) Transparent Conductive Films:
UNDER ELECTRON MICROSCOPE TOUCH SCREENS
PLASTIC SOLAR CELL
OLED LIGHTING FLAT PANEL DISPLAY SCREEN
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2) Printable Transistors:
WAFER OF CNT TRANSISTORS
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3) Field Emission:
4) Integrated Circuits:
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5) CNT Fibers: 6) CNT Paper Battery
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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.
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THANK YOU -GARGI KAPADIA