This document discusses graphene nanoribbons (GNRs). It provides background on graphene and carbon nanotubes before defining GNRs as carbon-based materials that inherit properties of graphene and nanotubes. GNRs have additional benefits like a tunable band gap. The document outlines their synthesis methods and applications in devices like LEDs, solar cells, and transistors due to properties like high electron mobility and strength.

1. DIGITAL ELECTRONICS
Presentation On:
Graphene Nanoribbons
Course Instructor: Rethwan Faiz

2. Submitted By
Rafiz, Shirajus Salekin 15-29362-1
Amin Md Ruhul 14-27013-2
Sarker, Avijit 15-28585-1
Ghosh, Sreekor 15-30757-3

3. OUTLINE:
Graphene
History
Properties of Graphene
Carbon Nanotubes
Graphene Nanoribbones
Advantages
Applications

4. GRAPHENE
 Graphene is an allotrope of carbon consisting of a
single layer of carbon atoms arranged in an
hexagonal lattice.

5. HISTORY
One of the very first patents pertaining to the
production of graphene was filed in oct,2002
entitled, ‘’Nano – Scaled Graphene plates’’.

6. PROPERTIES OF GRAPHENE
Pure substance.
High thermal conductivity.
Can conduct electricity very well.
Sheets of graphene are impermeable.

7. Graphene is the basic
structural element of
some carbon allotropes
including….

8. CARBON NANOTUBES(CNT)
Carbon nanotubes are basically graphene sheets
rolled up in a certain direction.
Carbon nanotubes are strong.

9. TYPES OF CARBON NANOTUBES

10. GRAPHENE NANORIBBONS(GNR)
Also called nano-graphite ribbons.
Carbon based material.

11. PROPERTIES OF GNR
Gnr inherits almost all the
attractive properties of the
carbon nanotube and
grapheme.
Has additional benefit of a
tunable band gap.

12. SYNTHESIS METHODS OF GNRS
The structure and physical properties of gnrs vary
significantly depending on the synthesis method.
 Cutting from graphene using lithography.
 Unzipping of carbon nanotubes.

13. ADVANTAGES
Higher electron mobility.
Superb electron.
Stronger.
Very less break over voltage.

14. APPLICATIONS
Light emitting diodes
P-N junctions
Schottkey diodes
Field effect transistors
Solar cell systems

15. JUNCTIONS
 A p-n junction is formed at the boundary between a p-
type and n-type semiconductor.
 Schottkey is a special case of a p-n junction.

16. TRANSISTORS
 A transistor is a semiconductor
device used to amplify.
 Field effect transistor relies on an
electric field.