Thermal conductivity of carbon nanotube superlattices: Comparative study with defective carbon nanotubes

Abstract

We use molecular dynamics simulation to calculate the thermal conductivities of (5, 5) carbon nanotube superlattices (CNTSLs) and defective carbon nanotubes (DCNTs), where CNTSLs and DCNTs have the same size. It is found that the thermal conductivity of DCNT is lower than that of CNTSL at the same concentration of Stone-Wales (SW) defects. We perform the analysis of heat current autocorrelation functions and observe the phonon coherent resonance in CNTSLs, but do not observe the same effect in DCNTs. The phonon vibrational eigen-mode analysis reveals that all modes of phonons are strongly localized by SW defects. The degree of localization of CNTSLs is lower than that of DCNTs, because the phonon coherent resonance results in the phonon tunneling effect in the longitudinal phonon mode. The results are helpful in understanding and tuning the thermal conductivity of carbon nanotubes by defect engineering.

Energy relaxation in disordered lattice ϕ 4 system: The combined effects of disorder and nonlinearity*

“…Over the past decades, the study of energy relaxation in anharmonic disordered systems has attracted a lot of interest both theoretically [1][2][3][4][5][6][7][8][9][10][11][12] and experimentally. [13][14][15][16][17][18] In a simple case of harmonic disordered systems, this is relevant to the celebrated Anderson localization phenomenon predicted for noninteracting electrons propagating in uncorrelated random landscapes, [19] which has the strongest effect in one dimension. In such a case, all the linear eigenmodes, i.e., the Anderson modes are localized, which means that any initially localized wave packet will remain localized for all time.…”

Enhancement of corona discharge induced wind generation with carbon nanotube and titanium dioxide decoration*

“…Furthermore, DWCNTs have poor adhesion to the conductive substrate, causing an unwanted contact resistance, which in turn creates the heating effect. [47][48][49] The poor adhesion may be a barrier for electrical carriers to transport during the discharge process. The created heating effect would ascend the electrical resistance of the discharge needle and 095202-4 then the corona current falls off.…”

Filled carbon-nanotube heterostructures: from synthesis to application

“…Carbon nanotubes have excellent conductivity [132] , optical [133] , and thermal properties [5] , mechanical properties [4] , and flexibility [134] , which can be applied to them in nano-electronics [2] , photovoltaic [135] , thermoelectric power generation [136] , energy storage [137] , catalytic [138] , and other important areas. SWCNTs can be a metal or semiconductor, depending on their atomic structure [139] .…”

“…CNTs have received widespread attention since they were confirmed to exist in 1991 by Japanese scientist Iijima [1] due to their one-dimensional (1D) nanostructure with remarkable electronic [2] , optical [3] , mechanical [4] , and thermal properties [5] . Because of these characteristics, CNTs are critical for the advancement of electronics and nanoelectronics [6] .…”