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Supporting information
Topotactic Conversion of Calcium Carbide to High-Crystalline
Few-Layer Graphene in Water
Yin Jia,a,b Xiangchao Chen,c Guoxin Zhang,c,* Lin Wang,a Cejun Hu,b and Xiaoming Suna,b,c,*
a. State Key Laboratory of Chemical Resource Engineering, Beijing Advanced
Innovation Center of Soft Materials Science and Engineering, Beijing University of
Chemical Technology, Beijing 100029, China
b. College of Energy, Beijing University of Chemical Technology, Beijing 100029,
China
c. College of Electrical Engineering and Automation, Shandong University of Science
and Technology, Qingdao 266590, China
* Corresponding to Emails: [email protected]; [email protected]
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A.This journal is © The Royal Society of Chemistry 2018
Figures and caption
5 um5 um
A B
C D
Figure S1. SEM images of ball-milled product of CaC2/LiOH (A) before and (B) after acid washing. (C) Digital image of acid-washed ball-milled product of CaC2/LiOH. (D) XRD profile of ball-milled product of CaC2/LiOH.
10 um 5 um
A B
5 um
C D
5 um
Figure S2. SEM images of graphene materials prepared using different H-containing solvent or solution: (A) diluted HCl solution, (B) H2O, (C) acetic acid, and (D) ethylene glycol.
0 1000 2000 3000 4000
1734516815304560255075
20406080
Wavenumber(cm-1)
EG
Inte
nsity
(cps
)
AA
Water
ID/IG=0.12
ID/IG=0.22
ID/IG=0.07
HCl ID/IG=0.08
Figure S3. Raman spectra of graphene materials prepared using different H-containing solvent or solution: diluted HCl solution, H2O, acetic acid (AA), and ethylene glycol (EG).
BA
1 um1000 2000 3000
G
Wavenumber (cm-1)
D
2D
Figure S4. (A) SEM images of FLG after re-suspension and centrifugation. (B) Raman spectra of upper-layer FLG.
B
500 nm
A
0 20 40 60 80
0
200
400
600
800
Inte
nsity
(a.u
.)
2 Theta (degree)
Ag+
Ag#04-0783
Figure S5. (A) SEM image and (B) XRD profile of Ag+-promoted synthesized FLG, inset of (A) shows the typical suspension after CaC2 reacting with Ag+ in DMF.
Table S1. Yields of few-layered graphene using different H-containing solvents or solution.
Name Reaction rate Yield (‰)
Diluted HCl Very fast 9.6
Water Fast 9.7
Acetic Acid Mediate 4.7
Ethylene Glycol Slow 0.16
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