基于石墨烯的机电热开关
Graphene-Based Electromechanical Thermal Switches
摘要：
热管理是现代电子、航空电子、汽车和储能系统中的一个重要挑战。虽然经常使用被动热解决方案（如散热器或散热器），但主动调节热流（例如通过热开关或二极管）将为热瞬变和系统可靠性的管理提供额外的控制程度。在这里，我们报告了第一个基于柔性可折叠石墨烯膜的热开关，具有< 2 V的低工作电压。我们还采用主动模式扫描热显微镜（SThM）来实时测量器件行为和开关。一个紧凑的分析热模型开发的一般情况下的热开关的基础上的双夹紧悬浮膜，突出的热和电气设计的挑战。系统级建模演示了作为开关比的函数的调制温度摆幅和平均温度之间的热权衡。这些基于石墨烯的热开关为密集集成系统中快速（甚至纳秒）热瞬变的主动控制提供了新的机会。
英文摘要：
Thermal management is an important challenge in modern electronics, avionics, automotive, and energy storage systems. While passive thermal solutions (like heat sinks or heat spreaders) are often used, actively modulating heat flow (e.g. via thermal switches or diodes) would offer additional degrees of control over the management of thermal transients and system reliability. Here we report the first thermal switch based on a flexible, collapsible graphene membrane, with low operating voltage, < 2 V. We also employ active-mode scanning thermal microscopy (SThM) to measure the device behavior and switching in real time. A compact analytical thermal model is developed for the general case of a thermal switch based on a double-clamped suspended membrane, highlighting the thermal and electrical design challenges. System-level modeling demonstrates the thermal trade-offs between modulating temperature swing and average temperature as a function of switching ratio. These graphene-based thermal switches present new opportunities for active control of fast (even nanosecond) thermal transients in densely integrated systems.
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