Graphene nanoparticles

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

7. 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 .

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

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

10. 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

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

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