Department of Mechanical Engineering, Kyushu University, Fukuoka 8190395, Japan.
Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, and Institute for Advanced Study, Tongji University, Shanghai 200092, China.
Nat Commun. 2017 Jun 13;8:15843. doi: 10.1038/ncomms15843.
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.
热整流是主动热流控制的一个基本现象。在不对称的纳米结构中，如纳米线和薄膜中，预计会存在显著的热整流。作为一种只有一个原子厚的膜，石墨烯因其在实现热整流方面的潜力而引起了广泛关注，这一点在许多分子动力学模拟中都得到了体现。在这里，我们通过实验证明了各种不对称单层石墨烯纳米结构中的热整流现象。在一侧具有纳米孔的缺陷工程化单层石墨烯中，实现了 26%的大热整流因子。在一侧沉积有纳米颗粒或具有渐缩宽度的原始单层石墨烯中，实现了 10%的热整流因子。结果表明，单层石墨烯在设计用于控制热流和能量收集的高性能热整流器方面具有很大的潜力。
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