Ultra-high thermal sensitivity of graphene microfiber
Ultra-high thermal sensitivity of graphene microfiber
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DOI：
10.1016/j.carbon.2022.12.013
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发表时间：
2022-12-12
期刊：
影响因子：
10.9
通讯作者：
Wang, Xinwei
中科院分区：
文献类型：
--
作者：
Lin, Huan;Hunter, Nicholas;Wang, Xinwei
石墨烯基微/纳米材料在热传感方面的应用还不多，但在微/纳米测量方面，它们比电流传感器具有很大的潜在优势。这项工作报告了超热传感能力的发现，特别是在石墨烯微纤维（GMF）的低温温度下。从295 K到11 K，GMF的电阻增加了大约5个数量级（105倍）。通过对GMF热物理性质的动态测量，探讨了GMF的极端热敏性。在25 K时，可以高置信度地感测到小至0.027 K的温度变化。此外，纤维在电流退火后仍然具有极高的灵敏度。当退火温度变得更高时，材料的微观结构显著改善，从而确保在热恶劣环境中的应用鲁棒性。GMF是一种新型的超灵敏温度测量材料，在微/纳米尺度下，特别是在低温下，其时间响应可以达到毫秒级。
Graphene-based micro/nanoscale materials have not been used much for thermal sensing while they have great potential advantages over current sensors for micro/nanoscale measurement. This work reports on the discovery of ultra thermal sensing capability, especially at cryogenic temperatures for graphene microfibers (GMFs). From 295 K down to 11 K, the electrical resistance of GMF increases by around five orders of magnitude (105-fold). GMF's extreme thermal sensitivity is explored by using it for dynamically measuring its thermophysical properties. At 25 K, a temperature change as small as 0.027 K can be sensed with high confidence. Moreover, the fibers still have extreme sensitivity after current annealing. When the annealing temperature becomes higher, the microstructure of the material improves considerably, thereby ensuring application robustness in thermally hostile environment. GMF presents a novel ultra-sensitive material for temperature measurement at the micro/ nanoscale, especially at cryogenic temperatures while its temporal response can reach a level of ms.