Freeze-drying-induced changes in the properties of graphene oxides
- Authors
- Ham, Heon; Tran Van Khai; Park, No-Hyung; So, Dae Sup; Lee, Joon-Woo; Na, Han Gil; Kwon, Yong Jung; Cho, Hong Yeon; Kim, Hyoun Woo
- Issue Date
- Jun-2014
- Publisher
- IOP PUBLISHING LTD
- Keywords
- freeze-drying; graphene oxides; Raman
- Citation
- NANOTECHNOLOGY, v.25, no.23, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOTECHNOLOGY
- Volume
- 25
- Number
- 23
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159888
- DOI
- 10.1088/0957-4484/25/23/235601
- ISSN
- 0957-4484
- Abstract
- 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).
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