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We report a hydrothermal method that directly reduces graphene oxide (GO) into graphene nanosheets (GNs) with different sizes. In the presence of NaOH and hydrazine, the hydrothermal reaction at 80 °C resulted in the formation of GNs with a lateral size of ~1 μm but the size of GNs decreased to ~300 and ~100 nm upon increasing the reaction temperature to 150 and 200 °C, respectively. The morphology...
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