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![]() MALEKPOUR, Hoda, RAMNANI, Pankaj, SRINIVASAN, Srilok, BALASUBRAMANIAN, Ganesh, NIKA, Denis, MULCHANDANI, Ashok K., LAKE, Roger K., BALANDIN, Alexander A.. Thermal conductivity of graphene with defects induced by electron beam irradiation. In: Nanoscale, 2016, vol. 8, pp. 14608-14616. ISSN 2040-3364. DOI: https://doi.org/10.1039/c6nr03470e |
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Nanoscale | ||||||
Volumul 8 / 2016 / ISSN 2040-3364 /ISSNe 2040-3372 | ||||||
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DOI:https://doi.org/10.1039/c6nr03470e | ||||||
Pag. 14608-14616 | ||||||
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We investigate the thermal conductivity of suspended graphene as a function of the density of defects, ND, introduced in a controllable way. High-quality graphene layers are synthesized using chemical vapor deposition, transferred onto a transmission electron microscopy grid, and suspended over ∼7.5 μm size square holes. Defects are induced by irradiation of graphene with the low-energy electron beam (20 keV) and quantified by the Raman D-to-G peak intensity ratio. As the defect density changes from 2.0 × 1010 cm-2 to 1.8 × 1011 cm-2 the thermal conductivity decreases from ∼(1.8 ± 0.2) × 103 W mK-1 to ∼(4.0 ± 0.2) × 102 W mK-1 near room temperature. At higher defect densities, the thermal conductivity reveals an intriguing saturation-type behavior at a relatively high value of ∼400 W mK-1. The thermal conductivity dependence on the defect density is analyzed using the Boltzmann transport equation and molecular dynamics simulations. The results are important for understanding phonon-point defect scattering in two-dimensional systems and for practical applications of graphene in thermal management. |
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Cuvinte-cheie Boltzmann equation, Chemical vapor deposition, Defect density, defects, Electron beams, Electrons, graphene, High resolution transmission electron microscopy, irradiation, Molecular dynamics, Point defects, transmission electron microscopy |
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