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Controllable size-selective method to prepare graphene quantum dots from graphene oxide.

Fan T, Zeng W, Tang W, Yuan C, Tong S, Cai K, Liu Y, Huang W, Min Y, Epstein AJ - Nanoscale Res Lett (2015)

Bottom Line: We demonstrated one-step method to fabricate two different sizes of graphene quantum dots (GQDs) through chemical cutting from graphene oxide (GO), which had many advantages in terms of simple process, low cost, and large scale in manufacturing with higher production yield comparing to the reported methods.Bright blue luminescent GQDs were obtained with a produced yield as high as 34.8%.Moreover, how the different sizes affect fluorescence wavelength mechanism was investigated in details.

View Article: PubMed Central - PubMed

Affiliation: Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing, Jiangsu 210046 China.

ABSTRACT
We demonstrated one-step method to fabricate two different sizes of graphene quantum dots (GQDs) through chemical cutting from graphene oxide (GO), which had many advantages in terms of simple process, low cost, and large scale in manufacturing with higher production yield comparing to the reported methods. Several analytical methods were employed to characterize the composition and morphology of the resultants. Bright blue luminescent GQDs were obtained with a produced yield as high as 34.8%. Moreover, how the different sizes affect fluorescence wavelength mechanism was investigated in details.

No MeSH data available.


UV absorption, PL spectrum, and PL property of GQDs-1 and GQDs-2. (a) UV/Vis absorption of the GQDs-1 and GQDs-2 were dispersed in water; (b) PL spectra of the GQDs-1 at different excitation wavelengths from 340 to 440 nm. (c) PL spectra of the GQDs-2 at different excitation wavelengths from 340 to 540 nm in water solution.
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Fig7: UV absorption, PL spectrum, and PL property of GQDs-1 and GQDs-2. (a) UV/Vis absorption of the GQDs-1 and GQDs-2 were dispersed in water; (b) PL spectra of the GQDs-1 at different excitation wavelengths from 340 to 440 nm. (c) PL spectra of the GQDs-2 at different excitation wavelengths from 340 to 540 nm in water solution.

Mentions: The UV absorption of the GQDs-1 and the GQDs-2 dispersed in water (Figure 7a). For the GQDs-1, a typical absorption peak at ca. 280, 320 nm was observed, which was assigned to the π-π* transition of aromatic sp2 domains [27]. For the GQDs-1, it showed the two sharp peaks at 285 and 325 nm. However, besides the strong π-π* absorption peak at 285 nm, a new absorption band at 325 nm was also observed. Excitation-dependent PL behaviors were common in fluorescent carbon materials.Figure 7


Controllable size-selective method to prepare graphene quantum dots from graphene oxide.

Fan T, Zeng W, Tang W, Yuan C, Tong S, Cai K, Liu Y, Huang W, Min Y, Epstein AJ - Nanoscale Res Lett (2015)

UV absorption, PL spectrum, and PL property of GQDs-1 and GQDs-2. (a) UV/Vis absorption of the GQDs-1 and GQDs-2 were dispersed in water; (b) PL spectra of the GQDs-1 at different excitation wavelengths from 340 to 440 nm. (c) PL spectra of the GQDs-2 at different excitation wavelengths from 340 to 540 nm in water solution.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385023&req=5

Fig7: UV absorption, PL spectrum, and PL property of GQDs-1 and GQDs-2. (a) UV/Vis absorption of the GQDs-1 and GQDs-2 were dispersed in water; (b) PL spectra of the GQDs-1 at different excitation wavelengths from 340 to 440 nm. (c) PL spectra of the GQDs-2 at different excitation wavelengths from 340 to 540 nm in water solution.
Mentions: The UV absorption of the GQDs-1 and the GQDs-2 dispersed in water (Figure 7a). For the GQDs-1, a typical absorption peak at ca. 280, 320 nm was observed, which was assigned to the π-π* transition of aromatic sp2 domains [27]. For the GQDs-1, it showed the two sharp peaks at 285 and 325 nm. However, besides the strong π-π* absorption peak at 285 nm, a new absorption band at 325 nm was also observed. Excitation-dependent PL behaviors were common in fluorescent carbon materials.Figure 7

Bottom Line: We demonstrated one-step method to fabricate two different sizes of graphene quantum dots (GQDs) through chemical cutting from graphene oxide (GO), which had many advantages in terms of simple process, low cost, and large scale in manufacturing with higher production yield comparing to the reported methods.Bright blue luminescent GQDs were obtained with a produced yield as high as 34.8%.Moreover, how the different sizes affect fluorescence wavelength mechanism was investigated in details.

View Article: PubMed Central - PubMed

Affiliation: Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing, Jiangsu 210046 China.

ABSTRACT
We demonstrated one-step method to fabricate two different sizes of graphene quantum dots (GQDs) through chemical cutting from graphene oxide (GO), which had many advantages in terms of simple process, low cost, and large scale in manufacturing with higher production yield comparing to the reported methods. Several analytical methods were employed to characterize the composition and morphology of the resultants. Bright blue luminescent GQDs were obtained with a produced yield as high as 34.8%. Moreover, how the different sizes affect fluorescence wavelength mechanism was investigated in details.

No MeSH data available.