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Long-range ordered and atomic-scale control of graphene hybridization by photocycloaddition

Abstract : Chemical reactions converting sp 2 to sp 3 hybridization have been demonstrated to be a fascinating yet challenging route to functionalize graphene. So far, it has not been possible to precisely control the reaction sites nor their lateral order at the atomic/molecular scale. The application prospects have been limited for reactions requiring long soaking, heating, electric pulses, or probe tip press. Herein, we demonstrate a spatially-selective photocycloaddition reaction of a two-dimensional (2D) molecular network with defect-free basal plane of single-layer graphene. Directly visualized at the sub-molecular level, the cycloaddition is triggered by ultraviolet irradiation in ultrahigh vacuum, requiring no aid of the graphene Moiré pattern. The reaction involves both [2+2] and [2+4] cycloaddition, with the reaction sites aligned into a 2D extended and well-ordered array, inducing a bandgap for the reacted graphene layer. This work provides a solid base for designing and engineering graphene-based optoelectronic and microelectronic devices.
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https://hal.archives-ouvertes.fr/hal-03064896
Contributor : André Gourdon <>
Submitted on : Monday, December 14, 2020 - 3:58:07 PM
Last modification on : Wednesday, December 23, 2020 - 3:38:00 AM

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Miao Yu, Chong Chen, Qi Liu, Cristina Mattioli, Hongqian Sang, et al.. Long-range ordered and atomic-scale control of graphene hybridization by photocycloaddition. Nature Chemistry, Nature Publishing Group, 2020, 12 (11), pp.1035-1041. ⟨10.1038/s41557-020-0540-2⟩. ⟨hal-03064896⟩

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