022007还原氧化石墨制备石墨烯.pdfVIP

Carbon 45 (2007) 1558–1565 /locate/carbon Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide Sasha Stankovich a, Dmitriy A. Dikin a, Richard D. Piner a, Kevin A. Kohlhaas a, Alfred Kleinhammes c, Yuanyuan Jia c, Yue Wu c, SonBinh T. Nguyen b,*, Rodney S. Ruoff a,* a Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208-3133, USA b Department of Chemistry, 2145 Sheridan Rd., Evanston, IL 60208-3113, USA c Department of Physics and Astronomy and Curriculum in Applied and Materials Sciences, University of North Carolina, Chapel Hill, NC, 27599-3255, USA Received 17 January 2007; accepted 19 February 2007 Available online 6 March 2007 Abstract Reduction of a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high-surface-area carbon material which consists of thin graphene-based sheets. The reduced material was characterized by elemental analysis, thermo-gravimetric analysis, scanning electron microscopy, X-ray photoelectron spectroscopy, NMR spectroscopy, Raman spectroscopy, and by electrical conductivity measurements. 2007 Elsevier Ltd. All rights reserved. 1. Introduction lets/nanoplatelets from the expanded material (ball milling or exposure to ultrasound) has