期刊
ACS NANO
卷 8, 期 10, 页码 11013-11022出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn505335u
关键词
aerogel; graphene
类别
资金
- UC Lab Fees Research Program [12-LR-235323]
- Lawrence Livermore National Laboratory under U.S. Department of Energy [DE-AC52-07NA27344]
- Lawrence Livermore National Laboratory through LDRD [13-LW-099]
- National Science Foundation under the Center of Integrated Nanomechanical Systems [EEC-0832819]
- Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Center for Electron Microscopy of the Lawrence Berkeley National Laboratory [DE-AC02-05CH11231, 1770]
- Office of Science, OBES of the US DoE [DE-AC02-05CH11231]
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 similar to 200 degrees C improvement in oxidation temperature and an order of magnitude increase in electrical conductivity.
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