THE EFFECT OF LASER ENERGY DENSITY ON THE PROPERTIES OF GRAPHENE DOTS
Authors
- Evgeniya V. Seliverstova Buketov Karaganda University
-
Professor Ibrayev N.
Buketov Karaganda University
-
Elmira Zh. Alikhaidarova
Buketov Karaganda University
DOI:
https://doi.org/10.31489/2022No2/30-34Keywords:
graphene oxide, graphene dots, laser ablation, structure, optical propertiesAbstract
The structural and optical properties of dots based on graphene oxide (GO) obtained by laser ablation
method with various energy densities of radiation were studied. It was shown that after laser ablation, the average
lateral size of GO sheets was decreased from 1280–1900 nm to 230±95 nm and 110±42 nm for samples prepared
at a laser radiation with energy density of E~15 and 21 mJ/cm2
, respectively. Raman spectroscopy data showed
that after ablation, the ID/IG ratio decreased from 1.04 to 0.97, indicating an increase in the number of sp2
-
hybridized domains in GO after ablation. A change in the energy density has practically no effect on a change in
its functionalization, as well as the ordering of sp2
domains inside a GO sheet. The optical density of GO
dispersions and the intensity of their fluorescence depend on the ablation conditions. For non-ablated dispersions
along with the luminescence band at 450 nm, additional band appears in the spectrum with a maximum at about
600 nm. After ablation the distribution of particles becomes more uniform, as evidenced by both the change in the
shape of the GO luminescence band and the constancy of the fluorescence lifetime upon registration at different
wavelength.
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