AI Article Synopsis
- Graphene boasts impressive electronic, optical, mechanical, and thermal properties, making it a promising material for electronic and sensing applications.
- The chemical modification of graphene, particularly through covalent bonding with organic diazonium salts, is used to tailor its electronic characteristics, although its performance is heavily influenced by the substrate it’s on.
- The study demonstrates that electron-transfer reactions occur rapidly on SiO(2) and Al(2)O(3) substrates but are minimal on alkyl-terminated and hBN surfaces, highlighting a substrate-based model of reactivity and enabling spatial patterning of reactions on graphene.
Article Abstract
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 SiO(2) and Al(2)O(3) (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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