单材料石墨烯热电偶
Single-Material Graphene Thermocouples
摘要：
随着纳米器件的复杂性和尺寸要求的增加以及随之而来的热探测和管理方面的挑战，微纳米尺度上的片上温度感测变得越来越理想。这突出了对可扩展和可靠的温度传感器的需求，这些传感器有可能被集成到当前和未来的设备结构中。在这里，我们展示了由一条宽腿和一条窄腿组成的U形石墨烯条带形成了一种单一材料热电偶，可以用作自供电温度传感器。我们发现，由于塞贝克系数的变化，石墨烯热电偶的灵敏度随着腿宽的减小而增加，这与我们先前的发现一致，并报告了$ΔS \approx$ 39 $\mathrmμ$ V/K的最大灵敏度。
英文摘要：
On-chip temperature sensing on a micro- to nanometer scale is becoming more desirable as the complexity of nanodevices and size requirements increase and with it the challenges in thermal probing and management. This highlights the need for scalable and reliable temperature sensors which have the potential to be incorporated into current and future device structures. Here, we show that U-shaped graphene stripes consisting of one wide and one narrow leg form a single material thermocouple that can function as a self-powering temperature sensor. We find that the graphene thermocouples increase in sensitivity with a decrease in leg width, due to a change in the Seebeck coefficient, which is in agreement with our previous findings and report a maximum sensitivity of $ΔS \approx$ 39 $\mathrmμ$V/K.
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