Thermal rectification on asymmetric suspended graphene nanomesh devices

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Nano Futures Pub Date : 2021-11-04 DOI:10.1088/2399-1984/ac36b5
Fayong Liu, M. Muruganathan, Yu-Lun Feng, Shinichi Ogawa, Y. Morita, Chunmeng Liu, Jiayu Guo, Marek E. Schmidt, H. Mizuta
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引用次数: 4

Abstract

Graphene-based thermal rectification was investigated by measuring the thermal transport properties of asymmetric suspended graphene nanomesh devices. A sub-10 nm periodic nanopore phononic crystal structure was successfully patterned on the half area of the suspended graphene ribbon by helium ion beam milling technology. The ‘differential thermal leakage’ method was developed for thermal transport measurement without disturbance from the leakage of electron current through the suspended graphene bridge. A thermal rectification ratio of up to 60% was observed in a typical device with a nanopore pitch of 20 nm. By increasing the nanopore pitch in a particular range, the thermal rectification ratio showed an increment. However, this ratio was degraded by increasing the environmental temperature. This experiment suggests a promising way to develop a high-performance thermal rectifier by using a phononic crystal to introduce asymmetry on homogeneous material.
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不对称悬浮石墨烯纳米网器件的热整流
通过测量不对称悬浮石墨烯纳米网器件的热传输特性,研究了基于石墨烯的热整流。利用氦离子束铣削技术在悬浮石墨烯带的半个区域成功地形成了亚10nm周期性纳米孔声子晶体结构。开发了“差热泄漏”方法,用于在没有电子电流通过悬浮石墨烯桥泄漏干扰的情况下进行热传输测量。在纳米孔间距为20nm的典型器件中观察到高达60%的热整流率。通过在特定范围内增加纳米孔间距,热整流比表现出增加。然而,随着环境温度的升高,这种比例降低了。该实验提出了一种很有前途的开发高性能热整流器的方法,即使用声子晶体在均匀材料上引入不对称性。
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来源期刊
Nano Futures
Nano Futures Chemistry-General Chemistry
CiteScore
4.30
自引率
0.00%
发文量
35
期刊介绍: Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.
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