Supplementary Information

High-Quality Reduced Graphene Oxide by a Dual-Function Chemical Reduction and Healing Process

Surajit Some, Youngmin Kim, Yeoheung Yoon, HeeJoun Yoo, Saemi Lee, Younghun Park and Hyoyoung Lee*

National Creative Research Initiative, Center for Smart Molecular Memory, Department of Chemistry, Samsung-SKKU Graphene Center, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Korea.

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Experimental Section

1.1 Materials

Natural graphite (Bay Carbon, SP-1 graphite), sulpuric acid (95-97%), hydrogen peroxide (30 wt. %), potassium permanganate, sodium nitrate, hydrazine tetrahydrofuran, hydrazine hydrate (35%), thiophene and dibenzothiophene were obtained from commercial sources and used as received.

Table S1. XPS Data

Entry / Name of Sample / C/O
1. / rGOC(0.2mL-T) / 3.8
2. / rGOC(1mL-T) / 7.7
3. / rGOC(5mL-T) / 12.8
4. / rGOCT(5mL-T) / 17.9

Table S2. Raman Data

Entry / Name of Sample / ID/IG
1. / GO / 0.91
2. / rGON2H4 / 1.2
3. / rGOC(2mL-T) / 0.41
4. / rGOC(0.2mL-T) / 0.81
5. / rGOC(1mL-T) / 0.65
6. / rGOC(5mL-T) / 0.43
7. / rGOCT(2mL-T) / 0.85
8. / rGOCT(5mL-T) / 0.83

Figure S1. High-resolution C1s spectra of GO.

Figure S2. XPS spectra of GO (black), rGOC (red) and rGOCT (blue).

Figure S3. Powder XRD pattern of graphite (black), GO (red) and control rGON2H4 (blue) produced by hydrazine.

Figure S4. Powder XRD pattern of rGOC and rGOCT produced by use of 5 mL thiophene.

Figure S5. Powder XRD pattern of rGOC produced by use of 0.2, 1 and 2 mL thiophene.

Figure S6. Raman spectra of as-prepared rGOC and rGOCT by using 2 mL thiophene.

Figure S7. Raman spectra of as-prepared rGOC and rGOCT by using 5 mL thiophene.

Figure S8. Picture of SO2 detection before and after SO2 gas passed.

Figure S9. EDX spectra of CaSO3.

Figure S10. AFM image of as-prepared rGOC sheet using thiophene.

Figure S11. AFM image of as-prepared rGOCT sheet using thiophene.

Figure S12. AFM image of GO sheet.

Figure S13. High-resolution TEM image and SAED pattern (inset) of the as-prepared a) rGOC and b) rGOCT.

Figure S14. NMR spectra of thiophene.

Figure S15. NMR spectra of dibenzothiophene before the reaction with GO.

Figure S16. NMR spectra of dibenzothiophene after the reaction with GO.