Simultaneous Sheet Cross-Linking and Deoxygenation in the Graphene Oxide Sol鈥揋el Transition

详细信息    查看全文

• 作者：Anna P. Goldstein ; William Mickelson ; Ariella Machness ; Gloria Lee ; Marcus A. Worsley ; Leta Woo ; Alex Zettl
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：December 11, 2014
• 年：2014
• 卷：118
• 期：49
• 页码：28855-28860
• 全文大小：305K
• ISSN：1932-7455

文摘

The precursor material to graphene aerogels is a hydrogel formed from an aqueous solution of graphene oxide. We investigate the time evolution of the physical and chemical properties of a graphene oxide suspension as it transitions to a hydrogel. Fully formed hydrogels undergo densification during reaction, forming mechanically stable monoliths. We demonstrate that the gelation process removes oxygen functional groups, partially re-forms the sp² network, and creates bonds between graphene oxide sheets. Furthermore, these changes to the physical and chemical properties occur on exactly the same time scale, suggesting that they have a common origin. This discovery lends greater understanding to the formation of graphene oxide-based hydrogels, which could allow more flexibility and tunability in synthetic methods for graphene-like materials.