Graphene is a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice
The name ‘graphene’ comes from graphite + -ene = graphene
1. Presentation topic: Graphene Nanoribbons
Presented to: Rethwan Faiz
Course name: Power System Analysis
Section: [G]
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2. Presentation members
Presented by:
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SL Name I.D
1 Waleed, Khaled bin 14-26027-1
2 Hossen, MD. Saddam 13-24244-2
3 Hossain, MD. Anowar 13-24191-2
4 Mozammel, S. M. Mahmud 14-25942-1
4. Graphene
Graphene is a one-atom-thick planar sheet of sp2-bonded carbon
atoms that are densely packed in a honeycomb crystal lattice
The name ‘graphene’ comes from graphite + -ene = graphene
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Molecular structure of
graphene
5. Properties of Graphene
pure substance, orderly structure based on tight, regular, atomic
bonding
Graphene is believed to be the strongest material yet
discovered
Has high thermal conductivity
Can conduct electricity very well
Is very light and transparent
Sheets of Graphene are impermeable
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Graphene is the basic structural element of some carbon allotropes
including…
Graphite
Charcoal
Carbon Nanotubes
Fullerene
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Carbon Nanotubes (CNT)
Carbon nanotubes (CNT) are basically graphene sheets rolled
up in a certain direction.
“Chiral vector” or “chirality” describes how a graphene sheet
is rolled up to form CNT.
CNT might be metallic or semiconducting, depending on its
chirality.
Carbon nanotubes are strong, they are not brittle.
They can be bent, and when released, they will spring back to
their original shape.
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Types of Carbon Nanotubes
A carbon nanotube with open ends A carbon nanotube with closed ends
9. Graphene Nanoribbons (GNR)
also called nano-graphite ribbons
carbon based material
one-dimensional structures with hexagonal two dimensional
carbon lattices
a derivative of Graphene
Graphene ribbons were introduced as a theoretical model
by Mitsutaka Fujita
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11. Properties of GNR
GNR inherits almost all the attractive properties of the carbon
nanotube and graphene.
Has additional benefit of a tunable band gap
Zigzag & Armchair GNRs have metallic or semiconducting
electronic properties that depends on the width of the
nanoribbon.
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Rolling of a Carbon nanotube (CNT)
from a graphene sheet
Cutting of a graphene
nanoribbon (GNR) from a sheet
of graphene
15. Synthesis methods of GNRs
The structure and physical properties of GNRs vary significantly
depending on the synthesis method. The methods are:
cutting from graphene using lithography
bottom-up synthesis from polycyclic molecules
unzipping of carbon nanotubes (CNTs)
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Comparison between two types of material used in
Transistors of Fig 1 and Fig 2
Table 1: Set of CNT’s Diameters Used for the Op Amp Design
where "a" is the carbon to carbon atomic
distance and it is
equal to 1.42 angstrom
Normal 7-99 angstrom transistor has a height of 0.65 cm and a diameter of 0.60 cm
It can be concluded that diameter of Transistor is greatly reduced
with usage of CNT material.