Electronic Supplementary Material (ESI) for New Journal of Chemistry
This journal is © The Royal Society of Chemistry and The Centre National de la Recherche Scientifique 2013
Submitted to New Journal of Chemistry
Electronic Supplementary Material
For
Self-assembled ionic nanohybrids of long-chain organic ion
grafted carbon dots with liquid-like behavior and dual
luminescence
Denian Lia, Xuan Hua, Qi Lia, Lijie Donga, Jing Huanga, Hairong Lia, Haian Xiea and
Chuanxi Xiong*a,b
a
State Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, and School of Materials Science and Engineering, Wuhan University of
Technology, Wuhan 430070, People’s Republic of China.
b
School of Materials Science and Engineering, Wuhan Textile University, Wuhan
430073, People’s Republic of China.
E-mail: [email protected]
Results & Discussions
H2 O
H2 O
1. Stirring
2. Standing
CHCl3
CHCl3
Figure S1. A contrast showing optial appearance of the mixture before and after
extraction. The brown color indicates the location of CDs.
Electronic Supplementary Material (ESI) for New Journal of Chemistry
This journal is © The Royal Society of Chemistry and The Centre National de la Recherche Scientifique 2013
Percentage (%)
35
30
25
20
15
10
5
0
1
2
3
4
Size (nm)
Figure S2. Size distribution of N-CDs obtained by measuring the diameters of 100
N-CDs in Fig. 2c.
100
80
TG%
60
93%
40
20
0
0
100
200
300
400
500
600
700
O
Temperature/ C
Figure S3. Thermal gravimetric analysis of N-CDs.
800
Electronic Supplementary Material (ESI) for New Journal of Chemistry
This journal is © The Royal Society of Chemistry and The Centre National de la Recherche Scientifique 2013
Normalized intensity
1.4
N-CDs in
Acetone
Absence of any solvents
1.2
1.0
0.8
0.6
0.4
0.2
0.0
400
450
500
550
Wavelength (nm)
600
650
Figure S4. Normalized fluorescence spectra of N-CDs in acetone and absence of any
solvents (at 360 nm excitation).
-COO-
N
+N
O -+
N
N+
Organic solvents
-C
OO
OO
C
-
+
-C
O
N-CDs
N+-CO
O-
O-CO
-C
OO
-COO-+N
C- OO
-+ N
O
-CO
-
-COOWater
N-CDs
N+
-COO
- COO-
-COO-
OO
C
-
Bare CDs
-+
N
Emissive centers
Figure S5. Cartoon illustration of CDs, N-CDs in water and, N-CDs in organic
solvents.
+N
Electronic Supplementary Material (ESI) for New Journal of Chemistry
This journal is © The Royal Society of Chemistry and The Centre National de la Recherche Scientifique 2013
FL Intensity (a.u.)
300
Vw,Va (mL)
10, 0
7.5, 2.5
5, 5
2.5, 7.5
0, 10
250
200
150
100
50
0
400
450
500
550
600
650
700
Wavelength (nm)
Figure S6. Fluorescence spectra of N-CDs dissolved in solution of mixed water and
acetone with different volume proportions. Volume of water (Vw) and acetone (Va).
1.0
Absorbance (a.u.)
N-CDs
CDs
225nm
0.5
230nm
270nm
0.0
200
300
400
500
600
700
800
Wavelength(nm)
Figure S7. UV-vis absorption spectra of CDs in water and N-CDs in ethanol. The 230
nm absorption peak in orange curve can be attributed to carbonyl groups in CDs. The
emerging peaks at 225 nm and 270 nm are ascribed to absorptions by NPEQ.