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. 2012;2:523.
doi: 10.1038/srep00523. Epub 2012 Jul 23.

A Novel Solid-State Thermal Rectifier Based on Reduced Graphene Oxide

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Free PMC article

A Novel Solid-State Thermal Rectifier Based on Reduced Graphene Oxide

He Tian et al. Sci Rep. .
Free PMC article

Abstract

Recently, manipulating heat transport by phononic devices has received significant attention, in which phonon--a heat pulse through lattice, is used to carry energy. In addition to heat control, the thermal devices might also have broad applications in the renewable energy engineering, such as thermoelectric energy harvesting. Elementary phononic devices such as diode, transistor and logic devices have been theoretically proposed. In this work, we experimentally create a macroscopic scale thermal rectifier based on reduced graphene oxide. Obvious thermal rectification ratio up to 1.21 under 12 K temperature bias has been observed. Moreover, this ratio can be enhanced further by increasing the asymmetric ratio. Collectively, our results raise the exciting prospect that the realization of macroscopic phononic device with large-area graphene based materials is technologically feasible, which may open up important applications in thermal circuits and thermal management.

Figures

Figure 1
Figure 1
(a) Photograph of the rGO paper. (b) Surface profile of rGO paper under SEM. (c) Cross section image of rGO paper under SEM. The thickness is ∼50 um. (d) EDX spectrum of rGO paper. There remains little oxygen atoms. (e) Schematic view of the measure system. A triangular rGO structure is tested. (f) Schematic view of the devices.
Figure 2
Figure 2. Testing results of the 60° triangular shaped solid-state thermal rectifier.
Monitored temperatures (left axis) and current (right axis) as a function of time at points 1 and 2 of (a) positive direction and (b) negative direction, respectively. Measured (c) heat power and (d) rectification coefficient versus temperature difference |ΔT|. In Figure 2 (c) and (d), the first point is formula image (formula image, formula image in positive direction); The second point is formula image (formula image, formula image in positive direction); The third point is formula image (formula image, formula image in positive direction); The fourth point is formula image (formula image, formula image in positive direction). Measured (e) heat power and (f) rectification coefficient versus angle formula image under |ΔT| = 40 K. In Figure 2(f), the first point is formula image = 20°(formula image, formula image in positive direction); The second point is formula image = 40°(formula image, formula image in positive direction); The third point is formula image = 60°(formula image, formula image in positive direction).
Figure 3
Figure 3. Schematic structure and experimental results of the two-rectangular shaped solid-state thermal rectifier.
(a) Schematic view of the devices. Monitored temperatures (left axis) and current (right axis) as a function of time at points 1 and 2 of (b) positive direction and (c) negative direction under Wbot/Wtop = 4.5, respectively. (d) Measured rectification coefficient versus temperature difference |ΔT| under Wbot/Wtop = 4.5. Inset is heat power versus temperature difference |ΔT|. In Figure 3 (c) and (d), the first point is formula image (formula image, formula image in positive direction); The second point is formula image (formula image, formula image in positive direction); The third point is formula image (formula image, formula image in positive direction); The fourth point is formula image (formula image, formula image in positive direction). Measured (e) heat power and (f) rectifying coefficient versus Wbot/Wtop under |ΔT| = 40 K. In Figure 3(f), the first point is Wbot/Wtop = 9/7 (formula image, formula image in positive direction); The second point is Wbot/Wtop = 9/5 (formula image, formula image in positive direction); The third point is Wbot/Wtop = 9/2 (formula image, formula image in positive direction).
Figure 4
Figure 4. Finite element modeling (FEM) simulation results of the two- rectangular shaped solid-state thermal rectifier.
Simulation results of the temperatures distribution in (a) positive direction and (b) negative direction, respectively. (c) The total heat power (Experiments) and the thermal radiation power (Calculation) versus temperature difference |ΔT|. (d) Calculated and measured rectification coefficient versus the temperature difference |ΔT| under Wbot/Wtop = 4.5. Calculated and measured (e) heat power and (f) rectification coefficient versus Wbot/Wtop under |ΔT| = 40 K.
Figure 5
Figure 5
(a) Plot of the theoretical temperature dependent thermal conductivity of rGO paper with different thickness. (b) Plot of the theoretical rectification of two-rectangular shaped rGO paper versus the film thickness under Wbot/Wtop = 9/2. (c) Comparison of temperature dependent thermal conductivity of rGO with copper and silicon.

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