Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 45, Pages 14980-14986Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08625
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Funding
- National Natural Science Foundation of China [51302233, 11374244]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2015R1A2A2A01006992]
- Center for Advanced Soft-Electronics - Ministry of Science, ICT and Future Planning of Korea [NRF-2011-0031630]
- Ministry of Education
- National Research Foundation of Korea
- [IBS-R019-D1]
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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 (C-12/C-13) and trilayer (C-12/C-13/C-12) 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 sp(3)-hybridized carbon.
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