Highly Oriented Monolayer Graphene Grown on a Cu/Ni(111) Alloy Foil

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Title
Highly Oriented Monolayer Graphene Grown on a Cu/Ni(111) Alloy Foil
Author(s)
Ming Huang; Mandakini Biswal; Hyo Ju Park; Sunghwan Jin; Deshun Qu; Seokmo Hong; Zhili Zhu; Lu Qiu; Da Luo; Xiaochi Liu; Zhang Yang; Zhongliu Liu; Yuan Huang; Hyunseob Lim; Won Jong Yoo; Feng Ding; Yeliang Wang; Zonghoon Lee; Rodney S. Ruoff
Publication Date
2018-06
Journal
ACS NANO, v.12, no.6, pp.6117 - 6127
Publisher
AMER CHEMICAL SOC
Abstract
Fast-growth of single crystal monolayer graphene by CVD using methane and hydrogen has been achieved on "homemade" single crystal Cu/Ni(111) alloy foils over large area. Full coverage was achieved in 5 min or less for a particular range of composition (1.3 at.% to 8.6 at. % Ni), as compared to 60 min for a pure Cu(111) foil under identical growth conditions. These are the bulk atomic percentages of Ni, as a superstructure at the surface of these foils with stoichiometry Cu6Ni1 (for 1.3 to 7.8 bulk at.% Ni in the Cu/Ni(111) foil) was discovered by low energy electron diffraction (LEED). Complete large area monolayer graphene films are either single crystal or close to single crystal, and include folded regions that are essentially parallel and that were likely wrinkles that "fell over" to bind to the surface; these folds are separated by large, wrinkle-free regions. The folds occur due to the buildup of interfacial compressive stress (and its release) during cooling of the foils from 1075 degrees C to room temperature. The fold heights measured by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) prove them to all be 3 layers thick, and scanning electron microscopy (SEM) imaging shows them to be around 10 to 300 run wide and separated by roughly 20 mu m. These folds are always essentially perpendicular to the steps in this Cu/Ni(111) substrate. Joining of well-aligned graphene islands (in growths that were terminated prior to full film coverage) was investigated with high magnification SEM and aberration-corrected high-resolution transmission electron microscopy (TEM) as well as AFM, STM, and optical microscopy. These methods show that many of the "join regions" have folds, and these arise from interfacial adhesion mechanics (they are due to the buildup of compressive stress during cool-down, but these folds are different than for the continuous graphene films-they occur due to "weak links" in terms of the interface mechanics). Such Cu/Ni(111) alloy foils are promising substrates for the large-scale synthesis of single-crystal graphene film. ⓒ 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5480
ISSN
1936-0851
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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