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Stabilizing a C–H bond on graphene with sound
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Journal Article
Stabilizing a C–H bond on graphene with sound
2019
Overview
The formation of carbon-hydrogen bonds on graphene is aided by sonic energy loss Unlike most other materials, graphene—a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice—contracts when heated ( 1 ). This unusual property is caused by the extreme asymmetry of the two-dimensional structure. When the carbon atoms vibrate thermally, they experience a strong in-plane restoring force and a weak out-of-plane restoring force. As a result, the out-of-plane vibrations have the larger amplitude, leading to a contraction of the graphene layer. On page 379 of this issue, Jiang et al. ( 2 ) show that this asymmetry also leads to an unusually efficient energy loss pathway in carbon-hydrogen (C–H) bond formation on graphene. The results demonstrate the existence of a previously unexplored pathway to energy loss in C–H bond formation and may provide a method to tune the properties of graphene through controlled C–H bond formation.
