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Issue 12, 2013
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Ammonia solution strengthened three-dimensional macro-porous graphene aerogel

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Abstract

Recently, many approaches were applied for assembling graphene sheets into a three-dimensional structure. However, it is still a great challenge to obtain a three-dimensional macroporous graphene network with high mechanical strength after drying. Herein, an ammonia strengthened three-dimensional graphene aerogel was prepared. Based on graphene chemistry and ice physics, the mechanical strength of graphene aerogel was improved greatly when the graphene hydrogel was treated by ammonia solution at an ambient temperature. The results demonstrated that the three-dimensional structure of graphene aerogels was destroyed thoroughly without ammonia solution treatment; conversely, the three-dimensional structure was maintained and the compressive strength was improved to 152 kPa at the static load after it was treated by ammonia solution at 90 °C for only 1 h. This phenomenon is due to two reasons: (1) the low freezing point of ammonia solution, which effectively retarded its freezing and then kept the porous structure undestroyed; (2) the reaction between ammonia and graphene hydrogel, which brought some covalent bonds among graphene sheets. We believe our efforts may pave the way for the development and application of three-dimensional graphene based materials.

Graphical abstract: Ammonia solution strengthened three-dimensional macro-porous graphene aerogel

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Article information


Submitted
25 Feb 2013
Accepted
03 Apr 2013
First published
08 Apr 2013

Nanoscale, 2013,5, 5462-5467
Article type
Paper

Ammonia solution strengthened three-dimensional macro-porous graphene aerogel

Z. Han, Z. Tang, P. Li, G. Yang, Q. Zheng and J. Yang, Nanoscale, 2013, 5, 5462
DOI: 10.1039/C3NR00971H

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