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Experimental study of thermal rectification in suspended monolayer graphene.

Haidong WangShiqian HuKoji TakahashiXing ZhangHiroshi TakamatsuJie Chen
Published in: Nature communications (2017)
Thermal rectification is a fundamental phenomenon for active heat flow control. Significant thermal rectification is expected to exist in the asymmetric nanostructures, such as nanowires and thin films. As a one-atom-thick membrane, graphene has attracted much attention for realizing thermal rectification as shown by many molecular dynamics simulations. Here, we experimentally demonstrate thermal rectification in various asymmetric monolayer graphene nanostructures. A large thermal rectification factor of 26% is achieved in a defect-engineered monolayer graphene with nanopores on one side. A thermal rectification factor of 10% is achieved in a pristine monolayer graphene with nanoparticles deposited on one side or with a tapered width. The results indicate that the monolayer graphene has great potential to be used for designing high-performance thermal rectifiers for heat flow control and energy harvesting.
Keyphrases
  • room temperature
  • molecular dynamics simulations
  • walled carbon nanotubes
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  • working memory
  • risk assessment