Hi Rasu.

Graphene is zero band gap material. And it can be tuned by many ways such as fictionalization, doping, applying electric field or magnetic field, applying strain,etc.

Graphene quantum dots are semiconducting materials, ie they have band, that is why we observe pl with them.

Go through the attachments and follow the link.

https://www.researchgate.net/post/Is_it_possible_to_calculate_the_Band_gap_energy_of_the_material_from_photoluminescence_PL_spectrum.

I hope this will be helpful to you to understand the band gaps of different graphenes.

Cheers...

Hi Rasu.

Graphene is zero band gap material. And it can be tuned by many ways such as fictionalization, doping, applying electric field or magnetic field, applying strain,etc.

Graphene quantum dots are semiconducting materials, ie they have band, that is why we observe pl with them.

Go through the attachments and follow the link.

https://www.researchgate.net/post/Is_it_possible_to_calculate_the_Band_gap_energy_of_the_material_from_photoluminescence_PL_spectrum.

I hope this will be helpful to you to understand the band gaps of different graphenes.

Cheers...

Thank you for information sir.

Intrinsic Graphene is a zero band gap semiconductor. However doping, graphene nanocomposites, charge transfer to graphene can lead to non zero band gap thus introducing desirable properties in graphene.

Thank you to all for sharing your information's...

what about the band gap of graphene oxide?

It has finite bandgap. Depends upon the extent of oxidation, different reports are there, reporting different bandgaps, mainly absorption in the range of 200-280 nm.

Thanks for your reply sir.

https://www.chemistryworld.com/news/graphene-band-gap-heralds-new-electronics/9000.article. this news informed of the ability ti get a 0.5 eV of graphene that could be used as semiconductor materials. Nevertheless doping and recently laser irradiation could be used in tunning the energy gap of materials.

https://www.researchgate.net/publication/216306844_Physical_and_Chemical_Changes_of_Polystyrene_Nanospheres_Irradiated_with_Laser

thank you Mohd Arif Agam