We have characterized and evaluated changes in graphene oxide (GO) induced by means of freeze-drying. In order to evaluate these changes, we investigated the effects of freeze-drying and chemical reduction processes on the structure, morphology, chemical composition, and Raman properties of GO and reduced GO. The freeze-dried GO had a pore structure, maintaining a pored morphology even after thermal annealing. The freeze-dried samples were composed of a single folded nanosheet or a few nanosheets stacked and folded. The oxygen-containing functional groups were removed not only during the freeze-drying but also during the reduction processes, with an accompanying decrease in the average size of the sp 2 carbon domain (i.e. an increase in the I D /I G value).
Heon Ham, Tran Van Khai, No-Hyung Park, Dae Sup So, Joon-Woo Lee, Han Gil Na, Yong Jung Kwon, Hong Yeon Cho and Hyoun Woo Kim
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Heon Ham, Tran Van Khai, No-Hyung Park, Dae Sup So, Joon-Woo Lee, Han Gil Na, Yong Jung Kwon, Hong Yeon Cho and Hyoun Woo Kim
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