Yuxi Xu, Hua Bai, Gewu Lu, Chun Li, Gaoquan Shi (2008). Flexible Graphene Films via the Filtration of Water-Soluble Noncovalent Functionalized Graphene Sheets Journal of the American Chemical Society, 130 (18), 5856-5857 DOI: 10.1021/ja800745y
This quick communication features a standard Hummers-style graphene oxide (GO) reduction, but uses a water-soluble pyrene derivative (1-pyrenebutyrate, PB-) as a stabilizer to keep the GO soluble in water after hydrazine reduction. They find that depositing films from this solution gives a PB-/reduced graphene complex that's one layer (1.7nm) thick in some regions. Filtering the solutions instead of depositing them gives a black, flexible film; one 30 micrometer thick film, for example, had a tensile strength of 8.4 MPa with a modulus of 4.2 GPa. The conductivity of these films was around 2X10^2 S/m, similar to our previous GO paper and about 7 orders of magnitude higher than the pre-reduced GO. The authors also use this material in some TiO2 solar cells and claim significant improvement.
Moral of the story: this paper is another incremental step in finding a nice way to make reduced GO films by using different stabilizing/solubilizing agents
EN#32
Friday, February 20, 2009
Flexible Graphene Films via the Filtration of Water-Soluble Noncovalent Functionalized Graphene Sheets
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2 comments:
Hi Rob
Could you please show me which coating techniques that can be used for depositing one layer graphene/graphene oxide film on SiO2/Si substrate?
Thank you very much
Hiddink,
Even looking at the supporting information, I did not see which technique the authors used to make the films for mechanical/spectroscopic testing, an omission I found odd. They used spin coating to make the films for their solar cells.
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