Journal
NANO ENERGY
Volume 35, Issue -, Pages 26-35Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.03.019
Keywords
Graphene nanomesh; Thermoelectric; Thermal conductivity; Bilayer graphene nanostructures; Block copolymer
Categories
Funding
- Global Frontier Research Program - Korean Government (MEST) [2011-0032156]
- R AMP
- D Convergence Program of NST (National Research Council of Science AMP
- Technology) of the Republic of Korea
- Korea Institute of Science and Technology (KIST)
- MITEI Seed Fund
- Ministry of Science & ICT (MSIT), Republic of Korea [2E27281] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0032156] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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When graphene is shrunk into similar to 10 nm scale graphene nanoribbons or nanomesh structures, it is expected that not only electrical properties but also thermal conductivity and thermoelectric property are significantly altered due to the quantum confinement effect and extrinsic phonon-edge scattering. Here, we fabricate large-area, sub-10 nm single-and bilayer graphene nanomeshes from block copolymer self-assembly and measure the thermal conductivity, thermoelectric and electrical transport properties to experimentally verify the effect of sub-10 nm quantum confinement, phonon-edge scattering and cross-plane coupling. Among the large variety of the samples, bilayer graphene nanomesh having 8 nm-neck width showed significantly low thermal conductivity down to similar to 78 W m(-1) K-1, which is the lowest thermal conductivity for suspended graphene nanostructures, and a high thermopower value of -520 mu V K-1, while it still shows the comparably high carrier mobility. Classical and quantum mechanical calculations successfully supported our nanomesh approach, which can achieve high thermoelectric properties based on the significantly reduced thermal conductivity and higher thermopower due to the confined geometry.
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