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Title: Synthesis and Characterization of Highly Crystalline Graphene Aerogels

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 ~200 °C improvement in oxidation temperature and an order of magnitude increase in electrical conductivity.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
  2. Univ. of California, Berkeley, CA (United States). Department of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
  3. Univ. of California, Berkeley, CA (United States). Department of Physics; Center of Integrated Nanomechanical Systems, Berkeley, CA (United States)
  4. Univ. of California, Berkeley, CA (United States). Department of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division; Center of Integrated Nanomechanical Systems, Berkeley, CA (United States); Univ. of California and Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Kavli Energy NanoSciences Institute
Publication Date:
Report Number(s):
LLNL-JRNL-660064
Journal ID: ISSN 1936-0851
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; 13-LW-099
Type:
Published Article
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 8; Journal Issue: 10; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; aerogel; graphene
OSTI Identifier:
1349316
Alternate Identifier(s):
OSTI ID: 1408974

Worsley, Marcus A., Pham, Thang T., Yan, Aiming, Shin, Swanee J., Lee, Jonathan R. I., Bagge-Hansen, Michael, Mickelson, William, and Zettl, Alex. Synthesis and Characterization of Highly Crystalline Graphene Aerogels. United States: N. p., Web. doi:10.1021/nn505335u.
Worsley, Marcus A., Pham, Thang T., Yan, Aiming, Shin, Swanee J., Lee, Jonathan R. I., Bagge-Hansen, Michael, Mickelson, William, & Zettl, Alex. Synthesis and Characterization of Highly Crystalline Graphene Aerogels. United States. doi:10.1021/nn505335u.
Worsley, Marcus A., Pham, Thang T., Yan, Aiming, Shin, Swanee J., Lee, Jonathan R. I., Bagge-Hansen, Michael, Mickelson, William, and Zettl, Alex. 2014. "Synthesis and Characterization of Highly Crystalline Graphene Aerogels". United States. doi:10.1021/nn505335u.
@article{osti_1349316,
title = {Synthesis and Characterization of Highly Crystalline Graphene Aerogels},
author = {Worsley, Marcus A. and Pham, Thang T. and Yan, Aiming and Shin, Swanee J. and Lee, Jonathan R. I. and Bagge-Hansen, Michael and Mickelson, William and Zettl, Alex},
abstractNote = {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 ~200 °C improvement in oxidation temperature and an order of magnitude increase in electrical conductivity.},
doi = {10.1021/nn505335u},
journal = {ACS Nano},
number = 10,
volume = 8,
place = {United States},
year = {2014},
month = {10}
}