期刊
NATURE CHEMISTRY
卷 4, 期 9, 页码 724-732出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1421
关键词
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资金
- US Office of Naval Research Multi University Research Initiative (MURI)
- NSF [DMR-0845287, DMR-0845358]
- Materials, Structures and Device (MSD) Center of the Focus Center Research Program (FCRP) at the Semiconductor Research Corporation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0845287] Funding Source: National Science Foundation
Graphene has exceptional electronic, optical, mechanical and thermal properties, which provide it with great potential for use in electronic, optoelectronic and sensing applications. The chemical functionalization of graphene has been investigated with a view to controlling its electronic properties and interactions with other materials. Covalent modification of graphene by organic diazonium salts has been used to achieve these goals, but because graphene comprises only a single atomic layer, it is strongly influenced by the underlying substrate. Here, we show a stark difference in the rate of electron-transfer reactions with organic diazonium salts for monolayer graphene supported on a variety of substrates. Reactions proceed rapidly for graphene supported on SiO2 and Al2O3 (sapphire), but negligibly on alkyl-terminated and hexagonal boron nitride (hBN) surfaces, as shown by Raman spectroscopy. We also develop a model of reactivity based on substrate-induced electron-hole puddles in graphene, and achieve spatial patterning of chemical reactions in graphene by patterning the substrate.
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