A one-step, solvothermal reduction method for producing reduced graphene oxide dispersions in organic solvents.
Refluxing graphene oxide (GO) in N-methyl-2-pyrrolidinone (NMP) results in deoxygenation and reduction to yield a stable colloidal dispersion. The solvothermal reduction is accompanied by a color change from light brown to black. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) images of the product confirm the presence of single sheets of the solvothermally reduced graphene oxide (SRGO). X-ray photoelectron spectroscopy (XPS) of SRGO indicates a significant increase in intensity of the C=C bond character, while the oxygen content decreases markedly after the reduction is complete. X-ray diffraction analysis of SRGO shows a single broad peak at 26.24 degrees 2theta (3.4 A), confirming the presence of graphitic stacking of reduced sheets. SRGO sheets are redispersible in a variety of organic solvents, which may hold promise as an acceptor material for bulk heterojunction photovoltaic cells, or electromagnetic interference shielding applications.
Dubin
Sergey
S
Department of Chemistry and Biochemistry and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA.
Gilje
Scott
S
Wang
Kan
K
Tung
Vincent C
VC
Cha
Kitty
K
Hall
Anthony S
AS
Farrar
Jabari
J
Varshneya
Rupal
R
Yang
Yang
Y
Kaner
Richard B
RB
D002244:Carbon / Q000737:chemistry*; D004553:Electric Conductivity; D006834:Hydrazines / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009930:Organic Chemicals / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D012997:Solvents / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
D006834:Hydrazines; D009930:Organic Chemicals; D010087:Oxides; D012997:Solvents; C029424:hydrazine; D002244:Carbon