Reference: Nanowerk

1. Graphene nanoparticles
Sandeepkumar C H
PG18AGR10022
Dept. of Agril. Entomology
College of Agriculture, Raichur

2. Graphene
• Graphene is the name for a honeycomb sheet of
carbon atoms. It is the building block for other
graphitic materials (since a typical carbon atom has
a diameter of about 0.33 nanometers, there are
about 3 million layers of graphene in 1 mm of
graphite).
• Harder than diamond yet more elastic than rubber;
tougher than steel yet lighter than aluminium.
Graphene is the strongest known material.

3. Discovery
• Andre Geim and Konstantin Novoselov, two physicists from
the University of Manchester, in 2004.
• They received the Nobel Prize in 2010.

4. Graphene aerogel, balancing on a flower.
Credit: Zhejiang University

5. Graphene possesses other
amazing characteristics
• Its high electron mobility is 100x faster than silicon
• It conducts heat 2x better than diamond
• Its electrical conductivity is 13x better than copper
• It absorbs only 2.3% of reflecting light
• It is impervious so that even the smallest atom (helium)
can't pass through a defect-free monolayer graphene sheet
• Its high surface area of 2630 square meters per gram means
that with less than 3 grams you could cover an entire soccer
field

6. Graphene sheets are building
blocks for other graphite materials

9. Biosynthesis
• GN/Ag and GN/Au nanocomposites can be
ecofriendly synthesized using Xanthium strumarium
leaf extract.
• The produced graphene/metal nanocomposites
may be less-toxic, biocompatible, and useful for
bioapplications.

10. Scheme for plant extract mediated
graphene/metal nanocomposite synthesis.

11. • TEM images of
(a) Ag nanoparticles,
(b) GN/Ag
nanocomposites,
(c) Au nanoparticles,
(d) GN/Au
nanocomposites

12. Toxicity
• GFNs can induce acute and chronic injuries in
tissues by penetrating through the blood-air barrier,
blood-testis barrier, blood-brain barrier, and blood-
placenta barrier etc. and accumulating in the lung,
liver, and spleen etc.
• GFNs did not pose a danger to human neural stem
cells at a dose of 250 μg/mL

13. Graphene uses and applications
• Energy storage and solar cells
• Sensor applications
• Electronics applications
• Photodetectors
• Coatings
• Other uses

15. THANK YOU!