The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
J. W. Ding - One of the best experts on this subject based on the ideXlab platform.
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Thermal conductivity of zigzag single-walled carbon nanotubes: Role of the Umklapp Process
Physical Review B, 2004Co-Authors: J. X. Cao, Y. Xiao, X. H. Yan, J. W. DingAbstract:Considering the three-phonon Process, we calculate the thermal conductivity of zigzag tubes. it is raund that thermal conductivity of an isolated (6, 0) single-walled carbon nanotube increases with the increase of temperature at low temperature, and would show a peak behavior at about 85 K before falling off at high temperature. Moreover, thermal conductivity is high for single-walled carbon nanotubes with small diameters as compared to the tubes with large diameters. The thermal conductivity at 300 K is approximately inversely proportional to the tube's diameter.
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Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
Journal of Physics: Condensed Matter, 2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result.
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LETTER TO THE EDITOR Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result. Continuous improvement of the fabrication of carbon nanotubes (CNTs) has attracted extensive research interest both experimentally and theoretically since their discovery [1, 2]. The unique electronic properties originating from their unique structures have stimulated calculations of their electronic structures involving developing some analytical [3] and numerical schemes [4– 6]. This research suggests that CNTs have bright prospects for applications: they can be used to fabricate field emission devices, tips for scanning probe microscopy instruments, and constituents of nanoelectronic devices [7–9]. Like the electronic properties, the thermal properties of CNTs, such as thermal conductivity, have been proposed as attractive for therma
J. X. Cao - One of the best experts on this subject based on the ideXlab platform.
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Thermal conductivity of zigzag single-walled carbon nanotubes: Role of the Umklapp Process
Physical Review B, 2004Co-Authors: J. X. Cao, Y. Xiao, X. H. Yan, J. W. DingAbstract:Considering the three-phonon Process, we calculate the thermal conductivity of zigzag tubes. it is raund that thermal conductivity of an isolated (6, 0) single-walled carbon nanotube increases with the increase of temperature at low temperature, and would show a peak behavior at about 85 K before falling off at high temperature. Moreover, thermal conductivity is high for single-walled carbon nanotubes with small diameters as compared to the tubes with large diameters. The thermal conductivity at 300 K is approximately inversely proportional to the tube's diameter.
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Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
Journal of Physics: Condensed Matter, 2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result.
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LETTER TO THE EDITOR Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result. Continuous improvement of the fabrication of carbon nanotubes (CNTs) has attracted extensive research interest both experimentally and theoretically since their discovery [1, 2]. The unique electronic properties originating from their unique structures have stimulated calculations of their electronic structures involving developing some analytical [3] and numerical schemes [4– 6]. This research suggests that CNTs have bright prospects for applications: they can be used to fabricate field emission devices, tips for scanning probe microscopy instruments, and constituents of nanoelectronic devices [7–9]. Like the electronic properties, the thermal properties of CNTs, such as thermal conductivity, have been proposed as attractive for therma
Y. Xiao - One of the best experts on this subject based on the ideXlab platform.
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Thermal conductivity of zigzag single-walled carbon nanotubes: Role of the Umklapp Process
Physical Review B, 2004Co-Authors: J. X. Cao, Y. Xiao, X. H. Yan, J. W. DingAbstract:Considering the three-phonon Process, we calculate the thermal conductivity of zigzag tubes. it is raund that thermal conductivity of an isolated (6, 0) single-walled carbon nanotube increases with the increase of temperature at low temperature, and would show a peak behavior at about 85 K before falling off at high temperature. Moreover, thermal conductivity is high for single-walled carbon nanotubes with small diameters as compared to the tubes with large diameters. The thermal conductivity at 300 K is approximately inversely proportional to the tube's diameter.
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Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
Journal of Physics: Condensed Matter, 2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result.
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LETTER TO THE EDITOR Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result. Continuous improvement of the fabrication of carbon nanotubes (CNTs) has attracted extensive research interest both experimentally and theoretically since their discovery [1, 2]. The unique electronic properties originating from their unique structures have stimulated calculations of their electronic structures involving developing some analytical [3] and numerical schemes [4– 6]. This research suggests that CNTs have bright prospects for applications: they can be used to fabricate field emission devices, tips for scanning probe microscopy instruments, and constituents of nanoelectronic devices [7–9]. Like the electronic properties, the thermal properties of CNTs, such as thermal conductivity, have been proposed as attractive for therma
X. H. Yan - One of the best experts on this subject based on the ideXlab platform.
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Thermal conductivity of zigzag single-walled carbon nanotubes: Role of the Umklapp Process
Physical Review B, 2004Co-Authors: J. X. Cao, Y. Xiao, X. H. Yan, J. W. DingAbstract:Considering the three-phonon Process, we calculate the thermal conductivity of zigzag tubes. it is raund that thermal conductivity of an isolated (6, 0) single-walled carbon nanotube increases with the increase of temperature at low temperature, and would show a peak behavior at about 85 K before falling off at high temperature. Moreover, thermal conductivity is high for single-walled carbon nanotubes with small diameters as compared to the tubes with large diameters. The thermal conductivity at 300 K is approximately inversely proportional to the tube's diameter.
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Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
Journal of Physics: Condensed Matter, 2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result.
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LETTER TO THE EDITOR Three-phonon Umklapp Process in zigzag single-walled carbon nanotubes
2003Co-Authors: Y. Xiao, X. H. Yan, J. X. Cao, J. W. DingAbstract:The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp Process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown that the value of the phonon mean free path reaches a few micrometres, which is consistent with the estimated experimental result. Continuous improvement of the fabrication of carbon nanotubes (CNTs) has attracted extensive research interest both experimentally and theoretically since their discovery [1, 2]. The unique electronic properties originating from their unique structures have stimulated calculations of their electronic structures involving developing some analytical [3] and numerical schemes [4– 6]. This research suggests that CNTs have bright prospects for applications: they can be used to fabricate field emission devices, tips for scanning probe microscopy instruments, and constituents of nanoelectronic devices [7–9]. Like the electronic properties, the thermal properties of CNTs, such as thermal conductivity, have been proposed as attractive for therma
Yunfei Chen - One of the best experts on this subject based on the ideXlab platform.
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Thermal conductivities of single-walled carbon nanotubes calculated from the complete phonon dispersion relations
Physical Review B, 2007Co-Authors: Yunfei ChenAbstract:The thermal conductivity of an individual single-walled carbon nanotube is calculated with the analysis of all possible combining and splitting Umklapp scattering Processes based on complete phonon dispersion relations. The relaxation rate for the transverse acoustic phonons that undergo the combination umpklapp Process is found to increase with many singularities as temperature rises. The calculated mean free path suggests that the combining (splitting) Umklapp Process is predominant in the low (high) frequency regime. The phonons with a very high frequency contribute little to thermal conduction due to the splitting Umklapp Process. The calculated thermal conductivity for (10,10) carbon nanotube is $474\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕\mathrm{m}\phantom{\rule{0.2em}{0ex}}\mathrm{K}$ at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$.