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Presentation topic: Graphene Nanoribbons
Presented to: Rethwan Faiz
Course name: Power System Analysis
Section: [G]
1
Presentation members
Presented by:
2
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
Outlines
Graphene
Carbon nanotubes (CNT)
Graphene nanoribbons (GNR)
Comparison between CNT and GNR
Synthesis methods of GNRs
Applications of GNRs
Op amp circuit using CNTFET
3
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
4
Molecular structure of
graphene
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
5
6
Graphene is the basic structural element of some carbon allotropes
including…
 Graphite
 Charcoal
 Carbon Nanotubes
 Fullerene
7
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.
8
Types of Carbon Nanotubes
A carbon nanotube with open ends A carbon nanotube with closed ends
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
9
10
types of GNR edges
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.
11
12
Comparison between CNT and GNR
A CNT Molecular Structure A GNR Molecular Structure
13
Comparison between CNT and GNR
A CNT Unit Cell A GNR Unit Cell
14
Rolling of a Carbon nanotube (CNT)
from a graphene sheet
Cutting of a graphene
nanoribbon (GNR) from a sheet
of graphene
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)
15
Applications of GNRs
Light emitting diodes
P-N junctions
Schottky diodes
Field effect transistors
Conductive electrodes
Solar cell systems
Field effect transistors
16
17
Op-Amp internal circuit
Fig 1: Normal material Op Amp
18
CNTFET Based Operational Amplifier Circuit
Fig 2: Schematic of a basic two stage Op Amp.
19
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.
20

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Graphene nanoribbons

  • 1. Presentation topic: Graphene Nanoribbons Presented to: Rethwan Faiz Course name: Power System Analysis Section: [G] 1
  • 2. Presentation members Presented by: 2 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
  • 3. Outlines Graphene Carbon nanotubes (CNT) Graphene nanoribbons (GNR) Comparison between CNT and GNR Synthesis methods of GNRs Applications of GNRs Op amp circuit using CNTFET 3
  • 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 4 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 5
  • 6. 6 Graphene is the basic structural element of some carbon allotropes including…  Graphite  Charcoal  Carbon Nanotubes  Fullerene
  • 7. 7 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.
  • 8. 8 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 9
  • 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. 11
  • 12. 12 Comparison between CNT and GNR A CNT Molecular Structure A GNR Molecular Structure
  • 13. 13 Comparison between CNT and GNR A CNT Unit Cell A GNR Unit Cell
  • 14. 14 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) 15
  • 16. Applications of GNRs Light emitting diodes P-N junctions Schottky diodes Field effect transistors Conductive electrodes Solar cell systems Field effect transistors 16
  • 17. 17 Op-Amp internal circuit Fig 1: Normal material Op Amp
  • 18. 18 CNTFET Based Operational Amplifier Circuit Fig 2: Schematic of a basic two stage Op Amp.
  • 19. 19 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.
  • 20. 20