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1. Thermal transport in graphyne nanoribbons£¬ Physical Review B

2. Thermal conductance modulator based on folded graphene nanoribbons£¬Applied Physics Letters

3. Ballistic thermal rectification in asymmetric three-terminal graphene nanojunctions, Physical Review B

4. Thermal transport in hexagonal boron nitride nanoribbons, Nanotechnology

5. Thermoelectric properties of gamma-graphyne nanoribbons and nanojunctions, Journal of Applied Physics

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1  Thermal transport in graphyne nanoribbons  
×÷Õß: Ouyang, T (Ouyang, Tao)[ 1 ] ; Chen, YP (Chen, Yuanping)[ 1 ] ; Liu, LM (Liu, Li-Min)[ 2 ] ; Xie, Y (Xie, Yuee)[ 1 ] ; Wei, XL (Wei, Xiaolin)[ 1 ] ; Zhong, JX (Zhong, Jianxin)[ 1 ]  
À´Ô´³ö°æÎï: PHYSICAL REVIEW B  ¾í: 85   ÆÚ: 23     ÎÄÏ׺Å: 235436   DOI: 10.1103/PhysRevB.85.235436   ³ö°æÄê: JUN 19 2012  
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ÕªÒª: Graphyne, a new allotrope of carbon, is a current topic of focus in the nanomaterial research community. We investigate the thermal transport property of graphyne nanoribbons (GYNRs) by using the nonequilibrium Green's-function method. The thermal conductance of GYNRs is only approximately 40% that of graphene nanoribbons. A distinct width dependence of the thermal property is observed in GYNRs as well. The conductance of armchair-edged GYNRs (A-GYNRs) shows a linear width dependence, while a steplike width dependence is displayed in the conductance of zigzag-edged GYNRs (Z-GYNRs). Moreover, the conductance of an A-GYNR is larger than that of a Z-GYNR of the same width, indicating obvious anisotropic transport in graphyne (twice that in graphene). In addition, the thermal transport in graphyne family nanoribbons is also explored. The results show that the conductance of graphyne family nanoribbons is insensitive to the acetylenic linkages, but depends on the number of benzene rings. These findings could offer useful guidelines for the design and performance improvement of the graphyne-based nanodevices.  



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2   Thermal conductance modulator based on folded graphene nanoribbons
×÷Õß: Ouyang, T (Ouyang, Tao)[ 1 ] ; Chen, YP (Chen, Yuanping)[ 1 ] ; Xie, YE (Xie, Yuee)[ 1 ] ; Stocks, GM (Stocks, G. M.)[ 2 ] ; Zhong, JX (Zhong, Jianxin)[ 1,2 ]
À´Ô´³ö°æÎï: APPLIED PHYSICS LETTERS  ¾í: 99   ÆÚ: 23     ÎÄÏ׺Å: 233101   DOI: 10.1063/1.3665184   ³ö°æÄê: DEC 5 2011
±»ÒýƵ´Î: 7 (À´×Ô Web of Science)
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ÕªÒª: Based on folded graphene nanoribbons, we report a thermal conductance modulator which performs analogous operations as the rheostat in electronic circuits. This fundamental device can controllably and reversibly modulate the thermal conductance by varying the geometric structures and its tuning range can be up to 40% of the conductance of unfolded nanoribbons (similar to 1 nm wide and 7-15 nm long). Under this modulation, the conductance shows a linearly dependence on the folded angle, while undergoes a transition with the variation of the inter-layer distance. This primary thermal device may have great potential applications for phononic circuits and nanoscale thermal management. (C) 2011 American Institute of Physics. [doi:10.1063/1.3665184]




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3     Ballistic thermal rectification in asymmetric three-terminal graphene nanojunctions
×÷Õß: Ouyang, T (Ouyang, Tao)[ 1 ] ; Chen, YP (Chen, Yuanping)[ 1 ] ; Xie, YE (Xie, Yuee)[ 1 ] ; Wei, XL (Wei, X. L.)[ 1 ] ; Yang, KK (Yang, Kaike)[ 1 ] ; Yang, P (Yang, Ping)[ 2 ] ; Zhong, JX (Zhong, Jianxin)[ 1 ]
À´Ô´³ö°æÎï: PHYSICAL REVIEW B  ¾í: 82   ÆÚ: 24     ÎÄÏ׺Å: 245403   DOI: 10.1103/PhysRevB.82.245403   ³ö°æÄê: DEC 6 2010
±»ÒýƵ´Î: 10 (À´×Ô Web of Science)
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ÕªÒª: Graphene nanojunctions (GNJs) are important components of future nanodevices and nanocircuits. Using the nonequilibrium Green's function method, we investigate the phononic properties of three-terminal GNJs (TGNJs). The results show that the heat flux runs preferentially along the direction from narrow to wide terminals, presenting an evident ballistic thermal rectification effect in the asymmetric TGNJs. The rectification efficiency is strongly dependent on the asymmetry of the nanojunctions, which increases rapidly with the width discrepancy between the left and right terminals. Meanwhile, the corner form of the TGNJs also plays an important role in the rectification effect. The mechanism of this thermal rectification is explained by a qualitative analysis. Compared to previous thermal rectifiers based on other materials, the asymmetric nanojunctions based on graphene possess much high rectification ratio which can approach about 200%. These indicate that asymmetric TGNJs might be a promising candidate for excellent ballistic thermal (phononic) devices.



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