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Ryu, Gyeong Hee,Park, Hyo Ju,Ryou, Junga,Park, Jinwoo,Lee, Jongyeong,Kim, Gwangwoo,Shin, Hyeon Suk,Bielawski, Christopher W,Ruoff, Rodney S,Hong, Suklyun,Lee, Zonghoon RSC Pub 2015 Nanoscale Vol.7 No.24
<P>The production of holes by electron beam irradiation in hexagonal boron nitride (hBN), which has a lattice similar to that of graphene, is monitored over time using atomic resolution transmission electron microscopy. The holes appear to be initiated by the formation of a vacancy of boron and grow in a manner that retains an overall triangular shape. The hole growth process involves the formation of single chains of B and N atoms and is accompanied by the ejection of atoms and bundles of atoms along the hole edges, as well as atom migration. These observations are compared to density functional theory calculations and molecular dynamics simulations.</P>
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. American Chemical Society 2016 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.138 No.45
<P>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.</P>