I have prepared carbon quantum dots by a simple hydrothermal treatment of glucose. Recently I got some papers on fluorescing Graphene Quantum dots. I was wondering whether both of them Graphene quantum dots and carbon quantum dots are same or not?
Look here
https://www.researchgate.net/post/What_are_differences_between_Carbon_and_Graphene_Quantum_Dots?_sg=tpR%2BCXLLXvO24PAbnu7cKVH%2Flqr7ZmneetuFWGWD8LsBsUk94PzFJLoqF0j3qVIh&_trid=53f5f136d5a3f21e778b45be_
By hydrothermal of glucose, you have absolutely no chance to get graphene quantum dots, in fact no graphene at all. Sucrose is a precursor of highly disordered carbon, therefore the quantum dots you got are "dots" because of their small size, but are 3D objects, unlike graphene with is purely 2D.
Alain
This paper will be useful for you.
http://pubs.acs.org/doi/abs/10.1021/nn300760g
First look at the Raman spectra and HRTEM of your sample. Then you might get some idea about its resemblance with Graphene. Graphene QDs are not like inorganic semiconductor QDs. Its a multilayer small size 2D graphene sheets.
@Alain Celzard..
I have done the hydrothermal treatment for carbon quantum dots and not for graphene quantum dots.
OK, so you got them for sure.
How did you do that ? Generally, hydrothermal treatment of sugars leads to (not so small) microspheres.
Alain
Look here
https://www.researchgate.net/post/What_are_differences_between_Carbon_and_Graphene_Quantum_Dots?_sg=tpR%2BCXLLXvO24PAbnu7cKVH%2Flqr7ZmneetuFWGWD8LsBsUk94PzFJLoqF0j3qVIh&_trid=53f5f136d5a3f21e778b45be_
No they are not the same. Difference between GQDs and CDs is like the difference between graphene and Graphite. CDs are spherical nanoparticles less than 10 nm and GQDs are disks with a diameter across less than 20 nm. They share some properties such as fluorescence and solubility in water and they can be distinguished in other properties surface to volume ratio, hydronamic diameter, biocompatibility, crystalline structure and their excitation/emission wavelengths sometimes.
Surface modifications are different in both cases. This is the beauty of CD from which substances it occurred.
Graphene Qds is another form of Carbon Qds however the major difference in between these two Qds are in their Crystallographic structure and energy levels. Graphene Qds shows sp2 hybridization state and Carbon Qds shows sp3. The difference can also be understood from their morphological structure and also depends upon types of precursor/stabilizing agent used. Graphene Qds usually found in crystalline nature whereas carbon Qds found amorphous. Hope it will be useful.
I think this review article will answer your question:
http://pubs.rsc.org/en/content/articlelanding/2016/cc/c5cc07754k#!divAbstract
There is not big differences between Carbon dot and Quantum dot, if we look on photoluminescence properties of both,
1.First, it is inefficient to tune the PL color by controlling the size of CDs. but in QDot its possible.
2. Another main difference between CDs and QDs is that the PL bandwidth of CDs is much wider.
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