Synthesis of large-scale undoped and nitrogen-doped amorphous graphene on MgO substrate by chemical vapor deposition
Despite amorphous graphene (a-graphene) domains having been created and observed within crystalline graphene, large-area synthesis is still in its infancy. Here, using MgO single crystals as a catalytic substrate, large-area (10 5 mm) undoped and nitrogen-doped a-graphene were synthesized by chemica...
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Published in | Journal of materials chemistry Vol. 22; no. 37; pp. 19679 - 19683 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.01.2012
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Subjects | |
Online Access | Get full text |
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Summary: | Despite amorphous graphene (a-graphene) domains having been created and observed within crystalline graphene, large-area synthesis is still in its infancy. Here, using MgO single crystals as a catalytic substrate, large-area (10 5 mm) undoped and nitrogen-doped a-graphene were synthesized by chemical vapor deposition with benzene and pyridine as precursors, respectively. The dependence of the number of layers and the crystallinity of a-graphene on the growth temperature was observed by transmission electron microscopy, selected area electron diffraction and Raman spectroscopy. Few-layer (2-5 layers) a-graphene films are demonstrated to have high transmittance (>85% at 550 nm) and low conductivity (<1 10 super(-3) S cm super(-1)). When doped with nitrogen (N/C ratio = similar to 0.09), the conductivity of the a-graphene film could be increased. The preparation of large-area a-graphene films not only extends to two-dimensional carbon materials but also might provide building blocks for future all-carbon devices. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0959-9428 1364-5501 |
DOI: | 10.1039/c2jm33209d |