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https://scholarbank.nus.edu.sg/handle/10635/134991
DC Field | Value | |
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dc.title | HEAT TRANSPORT BY PHONONS AND ELECTRONS ACROSS GRAPHENE INTERFACES AND GRAPHENE-BASED NANOSTRUCTURES | |
dc.contributor.author | HUANG BIN | |
dc.date.accessioned | 2017-03-07T18:00:15Z | |
dc.date.available | 2017-03-07T18:00:15Z | |
dc.date.issued | 2016-08-15 | |
dc.identifier.citation | HUANG BIN (2016-08-15). HEAT TRANSPORT BY PHONONS AND ELECTRONS ACROSS GRAPHENE INTERFACES AND GRAPHENE-BASED NANOSTRUCTURES. ScholarBank@NUS Repository. | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/134991 | |
dc.description.abstract | Due to high in-plane thermal conductivity of graphene, heat dissipation in graphene devices is primarily governed by the thermal resistance of metal/graphene interface. First, we compared the thermal conductance (<I>G</I>) of Al/trG/Cu and Al/grG/Cu to investigation which of the following factors: roughness, residues, oxides, conformity and voids could reduce the <I>G</I> of graphene interfaces. Second, we measured the <I>G</I> of Al/trG/Cu, Al/grG/Cu, Au/trG/Au, Ag/trG/Ag, and Pd/trG/Pd, and demonstrated that electrons do not play a crucial role in heat transfer across graphene interfaces, regardless of whether the metals are physisorbed or chemisorbed. We also demonstrate a convenient approach to enhance electronic heat transfer across metal/graphene interfaces by depositing the top Pd layer of Pd/trG/Pd interfaces using rf magnetron sputtering. Finally, we prepared metal/graphene heterostructures with the ratio of phononic and electronic thermal conductivity Λ<SUB>ph</SUB> / Λ<SUB>e</SUB> ≈1 at room temperature, despite the ultralow thermal conductivity of ≈0.1 W m<SUP>-1</SUP> K<SUP>-1</SUP>. | |
dc.language.iso | en | |
dc.subject | Graphene, nanoscale heat transfer, interfaces, phonons, time-domain thermoreflectance | |
dc.type | Thesis | |
dc.contributor.department | MECHANICAL ENGINEERING | |
dc.contributor.supervisor | KOH YEE KAN | |
dc.description.degree | Ph.D | |
dc.description.degreeconferred | DOCTOR OF PHILOSOPHY | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Ph.D Theses (Open) |
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HuangB.pdf | 19.32 MB | Adobe PDF | OPEN | None | View/Download |
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