一种用于测量局部热导率的金刚石加热-测温微传感器：明胶水凝胶案例研究
A diamond heater-thermometer microsensor for measuring localized thermal conductivity: a case study in gelatin hydrogel
AI总结：
本研究提出一种金刚石加热-测温微传感器，结合仿真模型实现全光学解耦测量局部热导率，精度约0.05 W/(m*K)，首次追踪水凝胶凝胶化过程的热导率变化，为细胞测温提供新工具。
摘要：
理解水凝胶的微观热效应对其在多个领域的应用至关重要，包括组织工程中的热相关研究和柔性电子器件的热管理。近几十年来，由于技术限制，局部热特性（如热导率）常常被忽视。为解决这一问题，我们提出了一种新型混合金刚石微传感器，能够以解耦方式同时进行温度控制和读数。具体而言，该传感器由一个长约10微米的硅柱（加热器）组成，其顶部有一个微米级金刚石颗粒，内含硅空位（SiV）中心（温度计），温度测量灵敏度为1.29 K*Hz^(-1/2)。将该创新且可扩展的传感器与一种新建立的仿真模型相结合，该模型可将加热激光引起的温度变化转换为热导率，我们引入了一种全光学解耦方法，精度约为0.05 W/(m*K)，可减少激光串扰。我们首次跟踪了水凝胶在凝胶化过程中的热导率变化，并证明了其变化的存在。我们介绍了一种快速、无干扰的微尺度热导率测量技术，有望成为细胞测温的宝贵工具，并强调了解耦可以减少不同激光之间的串扰，这对量子传感很有帮助。
英文摘要：
Understanding the microscopic thermal effects of the hydrogel is important for its application in diverse fields, including thermal-related studies in tissue engineering and thermal management for flexible electronic devices. In recent decades, localized thermal properties, such as thermal conductivity, have often been overlooked due to technical limitations. To tackle this, we propose a new hybrid diamond microsensor that is capable of simultaneous temperature control and readout in a decoupled manner. Specifically, the sensor consists of a silicon pillar (heater) at about 10 microns in length, topped by a micron-sized diamond particle that contains silicon-vacancy (SiV) centers (thermometer) with 1.29 K*Hz^(-1/2) temperature measurement sensitivity. Combining this innovative, scalable sensor with a newly established simulation model that can transform heating-laser-induced temperature change into thermal conductivity, we introduced an all-optical decoupled method with about 0.05 W/(m* K) precision, which can reduce laser crosstalk. For the first time, we track the thermal conductivity change of hydrogels during the gelation process and demonstrate the existence of variation. We introduce a rapid, undisturbed technique for measuring microscale thermal conductivity, potentially serving as a valuable tool for cellular thermometry and highlight the idea that decoupling can reduce crosstalk from different lasers, which is helpful for quantum sensing.
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