Synthesis of Water Soluble Graphene (2)

Supporting Information
One-Step Ionic Liquid-Assisted Electrochemical Synthesis of Ionic Liquid-Functionalized Graphene Sheet Directly from Graphite
Na Liu,a Fang Luo,*, a Haoxi Wu,a Yinghui Liu,b Chao Zhang b and Ji Chen b
1．Preparation of GNS ILs:
Two high-purity graphite rods (purchased from China National Medicines Shenyang Co.
Ltd) as electrodes, paralleled with a distance of 6.0 cm, were inserted into the ILs/water solution. An YJ26K model of potentiostat was used to provide potential. Static potentials of 10-20 V were added to the two electrodes. After 30 minutes, the anode graphite rod was corroded, and then a black precipitate gradually appeared at the bottom of the reactor.Finally, electrolyte formed a homogeneous solution. The precipitate was taken out of the reactor after
6 h, thoroughly washed with absolute ethanol and dried in oven for 2 h at 60 ºC. The product
of GNS ILs was obtained. The details of the experimental conditions and properties of the products have been shown in Table S1.
Table S1. Experimental conditions and properties of GNS ILs
synthesis condition properties
electrolyte (ml) GNS ILs
Ionic liquid water Voltage
(V)
Reaction time
(hour)
solubility conductivity
GNS C8P
[C8mim]+[PF6]-,
10
10 15 6 Yes Yes
GNS
C8B
[C 8mim]+[BF 4]-
,
10
10 15
6
Yes Yes
GNS C4P [C 4mim]+[PF 6]-,
10 10 15
6
Yes Yes
GNS 0[C 8mim]+Cl -, 20 0 20 10 No No GNS 1[C 8mim]+Cl -, 10 10 10 6 Yes No GNS 3[C 8mim]+Cl -, 5 15 10 6 Yes No GNS 5[C 8mim]+Cl -, 4 20 15 6 Yes No GNS 8[C 8mim]+Cl -, 3 24 15 6 Yes No GNS 10[C 8mim]+Cl -, 2 20 15 10 Yes No GNS 15[C 8mim]+Cl -, 2
30
15
10
Yes
No
2. The average thickness of the graphene was acquired as follow:
300 of the as-prepared graphene were counted and the thickness was measured. According to the thickness distribution histogram given below, the average thickness was obtained.
102030405060
7080F r e q u e n c y
Thickness /nm
Figure S1. Histogram of the graphene thickness distribution。