Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
310 0 |
SM ISO690:2012 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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Rezumat | ||||||
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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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 × 10<sup>10</sup> cm<sup>-2</sup> to 1.8 × 10<sup>11</sup> cm<sup>-2</sup> the thermal conductivity decreases from ∼(1.8 ± 0.2) × 10<sup>3</sup> W mK<sup>-1</sup> to ∼(4.0 ± 0.2) × 10<sup>2</sup> W mK<sup>-1</sup> 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<sup>-1</sup>. The thermal conductivity dependence on the defect density is analyzed using the Boltzmann transport equation and molecular dynamics simulations. 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