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Thermally Conductive Reduced Graphene Oxide Thin Films for Extreme Temperature Sensors

机译：极限温度传感器的导热还原氧化石墨烯薄膜

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摘要

Reduced graphene oxide (RGO) films are promising in applications ranging from electronics to flexible sensors. Though high electrical and thermal conductivities have been reported for RGO films, existing thermal conductivity data for RGO films show large variations from 30 to 2600 W m(-1) K-1. Further, there is a lack of data at low temperatures (300 K), which is critical for the understanding of thermal transport mechanisms. In this work, a temperature-dependent study of thermal (10-300 K) and electrical (10-3000 K) transport in annealed RGO films indicates the potential application of RGO films for sensing temperatures across an extremely wide range. The room-temperature thermal conductivity increases significantly from 46.1 to 118.7 W m(-1) K-1 with increasing annealing temperature from 1000 to 3000 K with a corresponding increase in the electrical conductivity from 5.2 to 1481.0 S cm(-1). In addition, films reduced at 3000 K are promising for sensing extreme temperatures as demonstrated through the measured electrical resistivity from 10 to 3000 K. Sensors based on RGO films are advantageous over conventional temperature sensors due to the wide temperature range and flexibility. Thus, this material is useful in many applications including flexible electronics and thermal management systems.
机译：还原型氧化石墨烯（RGO）膜在从电子产品到柔性传感器的各种应用中都有希望。尽管已报告了RGO膜的高电导率和热导率，但是RGO膜的现有热导率数据显示出从30到2600 W m（-1）K-1的较大差异。此外，在低温（<300 K）下缺乏数据，这对于理解热传输机制至关重要。在这项工作中，对退火的RGO薄膜中的热（10-300 K）和电（10-3000 K）传输进行了温度依赖性研究，表明RGO薄膜可用于在非常宽的范围内感测温度。随着退火温度从1000 K增加到3000 K，室温热导率从46.1显着增加到118.7 W m（-1）K-1，电导率从5.2到1481.0 S cm（-1）相应增加。此外，减少到3000 K的薄膜有望用于感测极端温度，如通过测得的电阻率（从10到3000 K）所证明的那样。基于RGO薄膜的传感器由于具有宽温度范围和灵活性而优于常规温度传感器。因此，这种材料可用于包括柔性电子和热管理系统在内的许多应用中。

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