期刊
ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY
卷 10, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2043-6254/ab1b73
关键词
graphene quantum dots (GQDs); nitrogen-doped graphene quantum dots (N-GQD); absorption spectra; PL spectra; Raman spectra; microwave
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.03-2018.03]
In this report we will present completely new results on the improvement of the graphene quantum dots (GQDs) and nitrogen-doped graphene quantum dots (N-GQD) production method, using the microwave with different power levels and durations, from citric acid and urea. This is a new and unprecedented method of fabrication. The use of microwave has allowed ultra-fast fabrication of GQDs and nitrogen doped GQDs. These GQDs had their characteristics identified by Raman scattering spectra for the characteristic C-C graphene vibration mode (G-peak) and defects of GQDs (D-peak). The absorption spectra of GQDs samples were fabricated under different conditions, with the expectation of different sizes, to be compared and analyzed. These absorption spectra were also compared with those of the N-GQD produced under the same conditions. The absorption mechanism of GQDs and N-GQD will be presented in detail. Measurements of the photoluminescence (PL) spectra in GQDs and N-GQD have also been recorded and analyzed. The fluorescence mechanism will be presented, explained, and compared with other international publications of other authors. Some of the TEM and HR-TEM images of these two samples were also presented to confirm the shape, size and in-plane spacing lattice of the GQD structure.
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