both quantum dots have the same graphite structure with lattice spacing around 0.34 nm. how can we differentiate?
Ram:
Graphene is a strictly two dimensional material. A single layer of carbon atoms sharing sp2 hybrid bonding. Carbon quantum dots are three dimensional objects sharing sp3 hybrid bonds. Quantum dots are generally not simply agglomerations of atoms.
Graphene is an extended solid (well, sheet) while quantum dots are simply super small clusters of atoms. Quantum dots are given the name because they are so small and the number of atoms are so few that the entire particle can exhibit certain quantum properties.
Since the bonding is different between the two materials, you can use any one of a number of different spectroscopic techniques to tell one from the other, e.g., FTIR. I'd say it's pretty tough to get a piece of graphene on the scale of a quantum dot. I would think it would collapse into a quantum dot (lower energy there for sure). It's really only stable in relatively extended sheets.
If you have one of those new fancy hi-res TEMs, you can actually see the difference. If you have a good X-ray diffraction instrument you might also pick up the very slight difference in bond length. The bonds have different strength after all. And that means the lattice constant is not exactly identical.
Ram, I hope this helps!
Pat
Ram:
Graphene is a strictly two dimensional material. A single layer of carbon atoms sharing sp2 hybrid bonding. Carbon quantum dots are three dimensional objects sharing sp3 hybrid bonds. Quantum dots are generally not simply agglomerations of atoms.
Graphene is an extended solid (well, sheet) while quantum dots are simply super small clusters of atoms. Quantum dots are given the name because they are so small and the number of atoms are so few that the entire particle can exhibit certain quantum properties.
Since the bonding is different between the two materials, you can use any one of a number of different spectroscopic techniques to tell one from the other, e.g., FTIR. I'd say it's pretty tough to get a piece of graphene on the scale of a quantum dot. I would think it would collapse into a quantum dot (lower energy there for sure). It's really only stable in relatively extended sheets.
If you have one of those new fancy hi-res TEMs, you can actually see the difference. If you have a good X-ray diffraction instrument you might also pick up the very slight difference in bond length. The bonds have different strength after all. And that means the lattice constant is not exactly identical.
Ram, I hope this helps!
Pat
Dear Ram,
Graphene QDs consist of few layers of graphene and its functional group. actually the lattice distance is about 0.24 nm for Graphene QDs. It has sp2 hybridization, like a small flake of Graphene.
For Carbon QDs the lattice distance is longer about 0.34 nm which is similar to crystal structure of graphite. Carbon QDs is amorphous and mostly sp3 hybridized.
I recommend you to read this articel.
Hope this will help you.
Good luck.
Article Glowing Graphene Quantum Dots and Carbon Dots: Properties, S...
The main differences between graphene and carbon quantum dots are size and morphology . Carbon dots are spherical or semispherical carbon particles with a size less than 10 nm while graphene quantum dots is a two dimensional material of mono-few layers of graphene in the size range of 2- 20 nm. Theoretically, the interlayer spacing ~ 3.35 Å for graphene layer-to-layer.
hello
this link below could help
https://www.quora.com/Nanotechnology-What-is-the-difference-between-carbon-nanotubes-CNT-and-graphene
regards
thank you dear professors for your suggestions and recommendations..i hope gained some ideas about these two carbon based materials.
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