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Bimodal Control of Heat Transport at Graphene–Metal Interfaces Using Disorder in Graphene

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Title
Bimodal Control of Heat Transport at Graphene–Metal Interfaces Using Disorder in Graphene
Author(s)
Jaehyeon Kim; Muhammad Ejaz Khan; Jae-Hyeon Ko; Jong Hun Kim; Eui-Sup Lee; Joonki Suh; Junqiao Wu; Yong-Hyun Kim; Jeong Young Park; Ho-Ki Lyeo
Publication Date
2016-10
Journal
Scientific Reports, v.6, no., pp.34428 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Thermal energy transport across the interfaces of physically and chemically modified graphene with two metals, Al and Cu, was investigated by measuring thermal conductance using the timedomain thermoreflectance method. Graphene was processed using a He2+ ion-beam with a Gaussian distribution or by exposure to ultraviolet/O3, which generates structural or chemical disorder, respectively. Hereby, we could monitor changes in the thermal conductance in response to varying degrees of disorder. We find that the measured conductance increases as the density of the physical disorder increases, but undergoes an abrupt modulation with increasing degrees of chemical modification, which decreases at first and then increases considerably. Moreover, we find that the conductance varies inverse proportionally to the average distance between the structural defects in the graphene, implying a strong in-plane influence of phonon kinetics on interfacial heat flow. We attribute the bimodal results to an interplay between the distinct effects on graphene’s vibrational modes exerted by graphene modification and by the scattering of modes. © The Author(s) 2016
URI
http://pr.ibs.re.kr/handle/8788114/3513
ISSN
2045-2322
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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