Dear colleagues,
We know that hummers method is one of the very famous method to make GO..after that we make GQDs from Graphene oxide.. Graphene oxide is a well conductor. After treat with GO in the alkaline medium in hydrothermal atmosphere we got GQDs.. But GQDs is a semiconductor. How?
Hello,
First of all, graphene oxide is not a good conductor. Pristine Graphene is a conductor. When you functionalize graphene and turn that to graphene oxide, it becomes a semiconductor. The conductivity of graphene oxide really depends on the degree of oxidation. However, you can reduce graphene oxide partially to make it conductive somehow, but of course not as good as pristine graphene/graphite.
But after functionalization Graphene Quantum Dot is semiconductor. how it change?
Single layer graphene is 2D. When graphene is converted to 0D material, its property changes due to quantum confinement and edge effects. Then it behaves like quantum dots (QDs) and hence behaves as a semiconductor. You can check this article:
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