Synthesis and Characterization of Highly Crystalline Graphene Aerogels
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- 作者：Marcus A. Worsley ; Thang T. Pham ; Aiming Yan ; Swanee J. Shin ; Jonathan R. I. Lee ; Michael Bagge-Hansen ; William Mickelson ; Alex Zettl
- 刊名：ACS Nano
- 出版年：2014
- 出版时间：October 28, 2014
- 年：2014
- 卷：8
- 期：10
- 页码：11013-11022
- 全文大小：715K
- ISSN：1936-086X
文摘
Aerogels are used in a broad range of scientific and industrial applications due to their large surface areas, ultrafine pore sizes, and extremely low densities. Recently, a large number of reports have described graphene aerogels based on the reduction of graphene oxide (GO). Though these GO-based aerogels represent a considerable advance relative to traditional carbon aerogels, they remain significantly inferior to individual graphene sheets due to their poor crystallinity. Here, we report a straightforward method to synthesize highly crystalline GO-based graphene aerogels via high-temperature processing common in commercial graphite production. The crystallization of the graphene aerogels versus annealing temperature is characterized using Raman and X-ray absorption spectroscopy, X-ray diffraction, and electron microscopy. Nitrogen porosimetry shows that the highly crystalline graphene macrostructure maintains a high surface area and ultrafine pore size. Because of their enhanced crystallinity, these graphene aerogels exhibit a 鈭?00 掳C improvement in oxidation temperature and an order of magnitude increase in electrical conductivity.