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Title: Impact of isotopic disorders on thermal transport properties of nanotubes and nanowires

We present a one-dimensional lattice model to describe thermal transport in isotopically doped nanotubes and nanowires. The thermal conductivities thus predicted, as a function of isotopic concentration, agree well with recent experiments and other simulations. Our results display that for any given concentration of isotopic atoms in a lattice without sharp atomic interfaces, the maximum thermal conductivity is attained when isotopic atoms are placed regularly with an equal space, whereas the minimum is achieved when they are randomly inserted with a uniform distribution. Non-uniformity of disorder can further tune the thermal conductivity between the two values. Moreover, the dependence of the thermal conductivity on the nanoscale feature size becomes weak at low temperature when disorder exists. In addition, when self-consistent thermal reservoirs are included to describe diffusive nanomaterials, the thermal conductivities predicted by our model are in line with the results of macroscopic theories with an interfacial effect. Our results suggest that the disorder provides an additional freedom to tune the thermal properties of nanomaterials in many technological applications including nanoelectronics, solid-state lighting, energy conservation, and conversion.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871 (China)
  2. HEDPS, Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871 (China)
  3. (China)
Publication Date:
OSTI Identifier:
22412969
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; DOPED MATERIALS; ENERGY CONVERSION; INTERFACES; NANOELECTRONICS; NANOMATERIALS; NANOTUBES; NANOWIRES; RANDOMNESS; SOLIDS; THERMAL CONDUCTIVITY