期刊
NANO RESEARCH
卷 7, 期 10, 页码 1477-1487出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0508-x
关键词
graphene sponge; hierarchical; freezing media; porous; foams
类别
资金
- Beijing Natural Science Foundation [2122027]
- National Basic Research Program of China [2011CB013000]
- National Natural Science Foundation of China [51372133]
- Tsinghua University Initiative Scientific Research Program [2012Z02102]
With the combination of surfactant and freeze-drying, we have developed two kinds of graphene spongy structures. On the one hand, using foams of soap bubbles as templates, three-dimensional porous graphene sponges with rich hierarchical pores have been synthesized. Pores of the material contain three levels of length scales, including millimeter, micrometer and nanometer. The structure can be tuned by changing the freezing media, adjusting the stirring rate or adding functional additives. On the other hand, by direct freeze-drying of a graphene oxide/surfactant suspension, a porous framework with directionally aligned pores is prepared. The surfactant gives a better dispersion of graphene oxide sheets, resulting in a high specific surface area. Both of the obtained materials exhibit excellent absorption capacity and good compression performance, providing a broad range of possible applications, such as absorbents, storage media, and carriers.
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