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[Carbon Letters]   Vol.13  No.1  (2012)  39 - 43
Control of size and physical properties of graphene oxide by changing the oxidation temperature  
   [39-43]-OA-3.pdf (10.4M) [107] DATE : 2012-11-01 17:25:51
The size and the physical properties of graphene oxide sheets were controlled by changing the  oxidation temperature of graphite. Graphite oxide (GO) samples were prepared at different oxidation  temperatures of 20oC, 27oC and 35oC using a modified Hummers’ method. The carbonto-  oxygen (C/O) ratio and the average size of the GO sheets varied according to the oxidation  temperature: 1.26 and 12.4 μm at 20oC, 1.24 and 10.5 μm at 27oC, and 1.18 and 8.5 μm at 35oC.  This indicates that the C/O ratio and the average size of the graphene oxide sheets respectively increase  as the oxidation temperature decreases. Moreover, it was observed that the surface charge  and optical properties of the graphene oxide sheets could be tuned by changing the temperature.  This study demonstrates the tunability of the physical properties of graphene oxide sheets and  shows that the properties depend on the functional groups generated during the oxidation process.

Kang D, Shin HS