Supplementary Information

Transcription

1 Supplementary Information Reduced Graphene Oxide by Chemical Graphitization In Kyu Moon, Junghyun Lee, Rodney S. Ruoff, & Hyoyoung Lee Contents Supplementary Tables S1 Elemental analyses of Graphite, G-O and RG-O HI-AcOH powders Supplementary Tables S2 Dispersion of the RG-O HI-AcOH powder in selected solvents with different polarity indices Supplementary Figure S1 Bulk quantity of RG-O HI-AcOH powder prepared from G-O Using the Solution-Phase Supplementary Figure S2 Possible reduction mechanism and procedure for preparing the RG-O HI-AcOH platelets Supplementary Figure S3 Solubility Test of RG-O HI-AcOH Powder Supplementary Figure S4 Tyndall effect of RG-O Supplementary Figure S5 Tapping mode AFM image and line scan of G-O platelets spin-coated on mica Supplementary Figure S6 Tapping mode AFM image and line scan of RG-O HI-AcOH platelets deposited on SiO 2 by spin-coating Supplementary Figure S7 XPS data of GO, and RG-O HI-AcOH powder Supplementary Figure S8 FT-IR spectra of G-O and RG-O HI-AcOH powders Supplementary Figure S9 UV-Vis spectra of G-O and RG-O HI-AcOH platelets

2 Supplementary Figure S10 Conductivity of RG-O HI-AcOH graphene, chemically converted graphene (CCG), chemically converted graphene (CCG2), and HRG Supplementary Figure S11 Fabrication of G-O paper and VRG-O HI-AcOH paper Supplementary Figure S12 Digital images of the apparatus for preparing VRG-O NH2NH2 paper Supplementary Figure S13 Deconvoluted XPS C1s spectra Supplementary Figure S14 Optical images of the surfaces

3 Supplementary Table S1 Elemental analyses of Graphite, G-O and RG-O HI- AcOH powders. Materials C O H N C/O C/(O+N) Graphite G-O RG-O HI-AcOH Supplementary Table S2 Dispersion of the RG-O HI-AcOH powder in selected solvents with different polarity indices 35,36. Stable Dispersion Solvents Polarity index of RG-O HI-AcOH DMF 6.4 yes DMSO 7.2 yes DMAc 6.5 yes NMP 6.7 yes CyH 4.5 no CH 3 CN 5.8 no THF 4.0 no EtOH 5.2 no toluene 2.4 no DCB 2.7 no DCM 3.1 no

4 Supplementary Figure S1 Bulk quantity of RG-OHI-AcOH powder prepared from G-O Using the Solution-Phase. Supplementary Figure S2 Possible reduction mechanism and procedure for preparing the RG-OHI-AcOH platelets.

5 Supplementary Figure S3 Solubility Test of RG-O HI-AcOH Powder. (a) Photographs of RG-O HI-AcOH dispersed in a variety of solvents prepared by 2 h sonication (RG-O HI-AcOH /solvents = 0.3 mg/10 ml; 9:1 volume ratio of solvent to DMF, (b) The photographs were taken 1 week after preparing the RG-O HI-AcOH dispersion.

6 Supplementary Figure S4 Tyndall effect of RG-O. (a) Images of RG-O HI-AcOH, (b) RG-O NH2NH2 colloidal dispersion in DMF (0.3 mg/10 ml) irradiated with a red laser beam. The laser beam was strongly scattered. Supplementary Figure S5 Tapping mode AFM image and line scan of G-O platelets spin-coated on mica. A typical line scan of a single G-O platelet indicates a thickness of ~ 1.0 nm.

7 Supplementary Figure S6 Tapping mode AFM image and line scan of RG-O HI- AcOH platelets deposited on SiO 2 by spin-coating. A typical line scan (red line) of an RG-O HI-AcOH platelet indicates a thickness of about 0.66 nm. Two overlapped RG- O HI-AcOH platelets (blue line) have a thickness of about 1.28 nm.

8 Supplementary Figure S7 XPS data of GO, and RG-O HI-AcOH powder. (a) XPS survey scan of graphite, G-O, and RG-O HI-AcOH powder samples, (b) and (c) deconvoluted C1s spectra of G-O, and RG-O HI-AcOH powders, respectively.

9 Supplementary Figure S8 FT-IR spectra of G-O and RG-O HI-AcOH powders. The G-O and RG-O HI-AcOH powders were dispersed in KBr discs (1.0 mg/200.0 mg KBr).

10 Supplementary Figure S9 UV-Vis spectra of G-O and RG-O HI-AcOH platelets. The G-O and RG-O HI-AcOH powders were dispersed in DMF (0.1 mg/ml).

11 Supplementary Figure S10 Conductivity of RG-O HI-AcOH graphene, chemically converted graphene (CCG) 14, chemically converted graphene (CCG2) 30, and HRG 13. A four-probe technique was used for the measurement at room temperature.

12 Supplementary Figure S11 Fabrication of G-O paper and VRG-OHI-AcOH paper.(a) G-O paper pre-patterned (Circle), (b) Flexible G-O paper (Rectangle), (c) Flexible G-O paper (Circle), (d) Preparation of bendable VRG-OHI-AcOH paper exposed to a vapor emanating from the HI-AcOH solution, and (e) Pictures of the bendable VRG-OHI-AcOH paper

13 Supplementary Figure S12 Digital images of the apparatus for preparing VRG-O NH2NH2 paper. G-O paper (lower-left), and VRG-O NH2NH2 paper (upper-left) that was obtained after exposure of the G-O paper to vapor emanating from the hydrazine (35 wt% in water) container.

14 Supplementary Figure S13 Deconvoluted XPS C1s spectra. (a) VRG-O NH2NH2, and (b) VRG-O HI-AcOH paper.

15 Supplementary Figure S14 Optical images of the surfaces. G-O paper (left), VRG-O HI-AcOH paper (middle), and VRG-O NH2NH2 papers (right). Supplementary References (2007) (2010).