Letter abstract
Nature Nanotechnology 3, 538 - 542 (2008)
Published online: 1 August 2008 | doi:10.1038/nnano.2008.210
Subject Categories: Nanomaterials | Synthesis and processing
Highly conducting graphene sheets and Langmuir–Blodgett films
Xiaolin Li1, Guangyu Zhang1, Xuedong Bai2, Xiaoming Sun1, Xinran Wang1, Enge Wang2 & Hongjie Dai1
Abstract
Graphene is an intriguing material with properties that are distinct from those of other graphitic systems1, 2, 3, 4, 5. The first samples of pristine graphene were obtained by 'peeling off'2, 6 and epitaxial growth5, 7. Recently, the chemical reduction of graphite oxide was used to produce covalently functionalized single-layer graphene oxide8, 9, 10, 11, 12, 13, 14, 15. However, chemical approaches for the large-scale production of highly conducting graphene sheets remain elusive. Here, we report that the exfoliation–reintercalation–expansion of graphite can produce high-quality single-layer graphene sheets stably suspended in organic solvents. The graphene sheets exhibit high electrical conductance at room and cryogenic temperatures. Large amounts of graphene sheets in organic solvents are made into large transparent conducting films by Langmuir–Blodgett assembly in a layer-by-layer manner. The chemically derived, high-quality graphene sheets could lead to future scalable graphene devices.
- Department of Chemistry and Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Correspondence to: Hongjie Dai1 e-mail: hdai@stanford.edu
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