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Ballistic phonon thermal conductance in graphene nanoribbons
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10.1116/1.4804617
/content/avs/journal/jvstb/31/4/10.1116/1.4804617
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/31/4/10.1116/1.4804617
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Structure models for (a) AGNR and (b) ZGNR. In these figures, each edge atom is terminated with the single hydrogen atom. represents the index number for the width of the ribbon in a unit of the number of dimer lines of GNR. shows the real width of the ribbon after the structural optimization.

Image of FIG. 2.
FIG. 2.

(Color online) Phonon dispersion relations for (a) -AGNR, (b)hydrogen-terminated -AGNR, and (c) hydrogen-terminated -ZGNR. Three acoustic modes (ZA, TA, and LA) and TW modes are indicated by solid and dashed lines, respectively. The lowest optical modes are marked by arrows.

Image of FIG. 3.
FIG. 3.

(Color online) Ballistic thermal conductance as a function of temperature for (a) dehydrogenated-AGNR ( = 4–8) and (b) hydrogenated-ZGNR ( = 2–6). Solid lines show the total thermal conductance. Dashed lines show the acoustic and the optical components, which are summed up for all the corresponding modes, respectively.

Image of FIG. 4.
FIG. 4.

(Color online) Normalized thermal conductance as a function of temperature: (a) 4-AGNR, (b) 7-AGNR, (c) 2-ZGNR-H, and (d) 5-GNR-H. Contributions of LA, TA, TW, ZA, and ZO are explicitly indicated and those from other optical modes are shown by solid lines without explanatory notes.

Image of FIG. 5.
FIG. 5.

(Color online) Ballistic thermal conductance per unit width, , as a function of temperature. Solid lines show the results for (a) dehydrogenated-AGNR ( = 4–8) and (b) hydrogenated-ZGNR ( = 2–6). Dashed line shows the ballistic thermal conductance per unit width for graphene for comparison.

Image of FIG. 6.
FIG. 6.

(Color online) Ballistic thermal conductances per unit width for dehydrogenated-(solid line) and hydrogenated-(dashed line) AGNR ( ) as a function of temperature, respectively. The inset shows the atomic structures optimized for dehydrogenated and hydrogenated AGNRs.

Image of FIG. 7.
FIG. 7.

(Color online) Normalized ballistic thermal conductances for (a) dehydrogenated AGNR and zigzag (7,0) SWCNT and (b) hydrogenated ZGNR and armchair () SWCNT ( = 3,4, and 5). Solid and dashed lines show the results for GNRs and SWCNTs, respectively. The inset shows the low-temperature behavior in detail.

Image of FIG. 8.
FIG. 8.

(Color online) Normalized ballistic thermal conductance for each component of (a) 14-AGNR and (b) (7,0) SWCNT. Contributions of LA, TA, TW, ZA, and ZO are explicitly indicated and those from other optical modes are shown by solid lines without explanatory notes. Dashed lines show the contribution ratio of all the optical modes to the total thermal conductance.

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/content/avs/journal/jvstb/31/4/10.1116/1.4804617
2013-05-14
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ballistic phonon thermal conductance in graphene nanoribbons
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/31/4/10.1116/1.4804617
10.1116/1.4804617
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