Birch-Type Hydrogenation of Few-Layer Graphenes: Products and Mechanistic Implications
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- Birch-Type Hydrogenation of Few-Layer Graphenes: Products and Mechanistic Implications
- Zhang, Xu; Huang, Yuan; Chen, Shanshan; Kim, Na Yeon; Kim, Wontaek; Schilter, David; Biswal, Mandakini; Li, Baowen; Lee, Zonghoon; Ryu, Sunmin; Bielawski, Christopher W.; Bacsa, Wolfgang S.; Ruoff, Rodney S.
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.138, no.45, pp.14980 - 14986
- Few-layer graphenes, supported on Si with a superficial oxide layer, were subjected to a Birch-type reduction using Li and H2O as the electron and proton donors, respectively. The extent of hydrogenation for bilayer graphene was estimated at 1.6–24.1% according to Raman and X-ray photoelectron spectroscopic data. While single-layer graphene reacts uniformly, few-layer graphenes were hydrogenated inward from the edges and/or defects. The role of these reactive sites was reflected in the inertness of pristine few-layer graphenes whose edges were sealed. Hydrogenation of labeled bilayer (12C/13C) and trilayer (12C/13C/12C) graphenes afforded products whose sheets were hydrogenated to the same extent, implicating passage of reagents between the graphene layers and equal decoration of each graphene face. The reduction of few-layer graphenes introduces strain, allows tuning of optical transmission and fluorescence, and opens synthetic routes to long sought-after films containing sp3-hybridized carbon.
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