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History, Properties, Applications, & Synthesis

Joseph Hsu

on 8 April 2015

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Transcript of Graphene

first studied in an theoretical work by Philip Wallace in 1947
known for his pioneering paper on the band structure of graphite & graphene
Gordon Walter, David P. DeVincenzo, and Eugene J. Mele
identified the electrical current carrying properties in graphene (theoretical work)
name "graphene" was first mentioned by S. Mouras and co-workers to describe graphite layer
Scotch Tape Experiment
their work was published in 2004 and provided inspiration around the world to study the properties of graphene
Andre and Kostya were awarded Nobel Prize in Physics in 2010
first isolated graphene flake were produced in 2003 by Andre and Kostya
(Scotch Tape Experiment)
Allotropes of Carbon
Adverse effects
Method 1
very little electrical and heat resistance, electrons move 200x faster than silicon
unlike silicon, graphene conductive is independent of temperature
Synthesis and production of Graphene
Pure carbon is available in a number of different forms (allotrope)
Graphene Future: uses for graphene
Graphene's Special Properties
very strong due to its honeycomb pattern and strong bonds between carbon atoms
strongest material known
graphene can be twisted, pulled and curved to a certain extent without breaking
bendable and strechable
graphene absorbs 2.3% of the visible light that hits it
desalinate seawater filters
block out salt ions, allowing only water molecules to pass thru graphene's tiny pores
Samsung are developing next-gen touchscreen using graphene's transparent, flexible and conductive properties
Satellites, planes, cars
super-strong, lightweight composite materials for next-gen satellites, planes and cars
Graphene to replace silicon chips
IBM has already piloted computers that use the material to achieve record setting clock speed of 100GHz
Military Equipment
super-strong fibre that could be spun into fabric to make lightweight bulletproof vests
Postage stamp size graphene sensor for explosive material detection
Nuclear clean-up
graphene oxide can absorb radioactive waste, which could help nuclear accidents like Fukushima disaster
Rust-free cars
protect steel from rusting for upto a month, by delaying the electrochemical reaction that oxidize iron
There are many more uses of graphene, at least one of them, if not all, will come in handy at some point in our life
vibrating diaphragm used in speaker to produce sound
graphene super-capacitors instead of batteries
artificial muscles
sorting DNA molecules
seeing in the dark-ultra sensitive photo-detector
Andre Geim
Kostya Novoselov
Nobel Museum in Stockholm
Mechanical Exfoliated Graphene
Chemical Vapor Deposition (CVD) growth on metal substrates
Graphene Oxide Reduction
Sonication of graphite
Developed and pioneered by Andre and Kostya
Methane decomposition reaction, hydrogen form by-product
Graphite powder
Graphene oxide
reduced GO, or chemically converted graphene
1) graphite powder disperse into suitable liquid medium, which is then sonciated
2) non exfoliated graphite is then separated from graphene by centrifugation
Full transcript