Abstract
Nitrogen-containing carbon dots were synthesized from glucose and glucosamine by hydrothermal treatment. The relation between the PL properties of the carbon dots and chemical states of nitrogen in them are discussed. The actual N/C ratio of synthesized samples increased from 0.00 to 0.08 as the nominal molar percentage of glucosamine/(glucose+glucosamine), xN, was increased from 0 to 100 mol%. The samples were nanoparticles with microscopic local graphite structure. Some nitrogen atoms were doped in the graphite skeleton, and others were present as surface NH2 groups. The nanoparticles exhibited blue photoluminescence (PL) under near-ultraviolet excitation. The PL peak shifted to longer wavelength as the excitation wavelength increased. PL intensity was proportional to the absorbance of the carbon dots, and both increased with the amount of nitrogen doped in the graphite skeleton. Other carbon dots were synthesized using ammonium hydroxide as a nitrogen source instead of glucosamine. These samples possessed abundant surface NH2 groups, and exhibited no change in PL intensity with increasing NH2 content. Nitrogen doped in the graphite skeleton formed donor levels in the energy band of the carbon dots, increasing the amount of absorption centers and enhancing PL.
| Original language | English |
|---|---|
| Pages (from-to) | 123-131 |
| Number of pages | 9 |
| Journal | Journal of Luminescence |
| Volume | 180 |
| DOIs | |
| Publication status | Published - 2016 Dec 1 |
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Keywords
- Carbon dot
- Glucose
- Hydrothermal synthesis
- Nanoparticle
- Nitrogen
- Photoluminescence
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Chemistry(all)
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
Cite this
Influence of chemical states of doped nitrogen on photoluminescence intensity of hydrothermally synthesized carbon dots. / Niino, Shinichiro; Takeshita, Satoru; Iso, Yoshiki; Isobe, Tetsuhiko.
In: Journal of Luminescence, Vol. 180, 01.12.2016, p. 123-131.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of chemical states of doped nitrogen on photoluminescence intensity of hydrothermally synthesized carbon dots
AU - Niino, Shinichiro
AU - Takeshita, Satoru
AU - Iso, Yoshiki
AU - Isobe, Tetsuhiko
PY - 2016/12/1
Y1 - 2016/12/1
N2 - Nitrogen-containing carbon dots were synthesized from glucose and glucosamine by hydrothermal treatment. The relation between the PL properties of the carbon dots and chemical states of nitrogen in them are discussed. The actual N/C ratio of synthesized samples increased from 0.00 to 0.08 as the nominal molar percentage of glucosamine/(glucose+glucosamine), xN, was increased from 0 to 100 mol%. The samples were nanoparticles with microscopic local graphite structure. Some nitrogen atoms were doped in the graphite skeleton, and others were present as surface NH2 groups. The nanoparticles exhibited blue photoluminescence (PL) under near-ultraviolet excitation. The PL peak shifted to longer wavelength as the excitation wavelength increased. PL intensity was proportional to the absorbance of the carbon dots, and both increased with the amount of nitrogen doped in the graphite skeleton. Other carbon dots were synthesized using ammonium hydroxide as a nitrogen source instead of glucosamine. These samples possessed abundant surface NH2 groups, and exhibited no change in PL intensity with increasing NH2 content. Nitrogen doped in the graphite skeleton formed donor levels in the energy band of the carbon dots, increasing the amount of absorption centers and enhancing PL.
AB - Nitrogen-containing carbon dots were synthesized from glucose and glucosamine by hydrothermal treatment. The relation between the PL properties of the carbon dots and chemical states of nitrogen in them are discussed. The actual N/C ratio of synthesized samples increased from 0.00 to 0.08 as the nominal molar percentage of glucosamine/(glucose+glucosamine), xN, was increased from 0 to 100 mol%. The samples were nanoparticles with microscopic local graphite structure. Some nitrogen atoms were doped in the graphite skeleton, and others were present as surface NH2 groups. The nanoparticles exhibited blue photoluminescence (PL) under near-ultraviolet excitation. The PL peak shifted to longer wavelength as the excitation wavelength increased. PL intensity was proportional to the absorbance of the carbon dots, and both increased with the amount of nitrogen doped in the graphite skeleton. Other carbon dots were synthesized using ammonium hydroxide as a nitrogen source instead of glucosamine. These samples possessed abundant surface NH2 groups, and exhibited no change in PL intensity with increasing NH2 content. Nitrogen doped in the graphite skeleton formed donor levels in the energy band of the carbon dots, increasing the amount of absorption centers and enhancing PL.
KW - Carbon dot
KW - Glucose
KW - Hydrothermal synthesis
KW - Nanoparticle
KW - Nitrogen
KW - Photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=84983552273&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84983552273&partnerID=8YFLogxK
U2 - 10.1016/j.jlumin.2016.08.021
DO - 10.1016/j.jlumin.2016.08.021
M3 - Article
AN - SCOPUS:84983552273
VL - 180
SP - 123
EP - 131
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
ER -