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• W2969529949 abstract "A two-dimensional nanocarbon, graphene, has attracted substantial interest due to its excellent properties. The reduction of graphene oxide (GO) has been investigated for the mass production of graphene used in practical applications. Different reduction processes produce different properties in graphene, affecting the performance of the final materials or devices. Therefore, an understanding of the mechanisms of GO reduction is important for controlling the properties of functional two-dimensional systems. Here, we determined the average structure of reduced GO prepared via heating and photoexcitation and clearly distinguished their reduction mechanisms using ultrafast time-resolved electron diffraction, time-resolved infrared vibrational spectroscopy, and time-dependent density functional theory calculations. The oxygen atoms of epoxy groups are selectively removed from the basal plane of GO by photoexcitation (photon mode), in stark contrast to the behavior observed for the thermal reduction of hydroxyl and epoxy groups (thermal mode). The difference originates from the selective excitation of epoxy bonds via an electronic transition due to their antibonding character. This work will enable the preparation of the optimum GO for the intended applications and expands the application scope of two-dimensional systems." @default.
• W2969529949 created "2019-08-29" @default.
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• W2969529949 date "2019-08-27" @default.
• W2969529949 modified "2023-09-23" @default.
• W2969529949 title "Selective Reduction Mechanism of Graphene Oxide Driven by the Photon Mode <i>versus</i> the Thermal Mode" @default.
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• W2969529949 doi "https://doi.org/10.1021/acsnano.9b03060" @default.
• W2969529949 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31450883" @default.
• W2969529949 hasPublicationYear "2019" @default.
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