Ultrafine-fiber thermistors for microscale biomonitoring
Ultrafine-fiber thermistors for microscale biomonitoring
复制标题
用于微型生物监测的超细纤维热敏电阻
DOI：
10.1039/d2tc04548f
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发表时间：
2023
影响因子：
6.4
通讯作者：
Tsuchiya Tetsuo
中科院分区：
文献类型：
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作者：
Nakajima Tomohiko;Tsuchiya Tetsuo
我们在室温下采用KrF激光照射的光结晶技术在超细芳纶（聚对苯二甲酰对苯二胺）纤维上制备了尖晶石Mn1.4Co0.9Ni0.5Cu0.2O4（MCNC）薄膜热敏电阻。我们使用MCNC纳米颗粒分散体涂覆直径为15微米的芳纶纤维，并采用KrF激光照射使纤维表面的MCNC薄膜结晶。由此产生的超细纤维热敏电阻表现出良好的半导体行为，热敏电阻常数高达 2767.3 K。它还表现出非常快的响应时间，仅为约 100 kHz。 100ms，上升率和下降率几乎相当。观察到这些快速响应是由于纤维基材的横截面积 (S) 极小而导致的热容较小。热传递模拟表明，与基板厚度为 60 μm 的片状热敏电阻相比，Φ15 μm 芯光纤热敏电阻可以更可靠地检测微观物体的温度变化。通过对纤维型和片型热敏电阻的温度模拟，我们还证实响应的上升和下降时间尺度（τr 和 τd）的等效性不受传入/传出基板的不良热流的影响。 τd/τr 接近 1.0 并尽可能减小 S 值非常重要，因为 τd/τr 与 log S 成正比。 Φ15 μm 芯光纤热敏电阻的 τd/τr 值很小，仅为 1.12。超细 MCNC 纤维热敏电阻的快速、准确的温度响应使其成为微型温度传感器的有希望的候选者。
We have prepared spinel Mn1.4Co0.9Ni0.5Cu0.2O4 (MCNC) film thermistors on ultrafine aramid (poly-p-phenylene-terephthalamide) fibers using a photocrystallization technique with KrF laser irradiation at room temperature. We coated a ϕ15 μm diameter aramid fiber using an MCNC nanoparticle dispersion, and we employed KrF laser irradiation to crystallize the MCNC film on the fiber surface. The resulting ultrafine-fiber thermistor showed a good semiconducting behavior with a high thermistor constant of 2767.3 K. It also exhibited a very rapid response time of only ca. 100 ms, and the rise and drop rates were almost equivalent. These rapid responses were observed due to the small heat capacity that resulted from the minuscule cross-sectional area (S) of the fiber substrate. Thermal-transfer simulations showed that the ϕ15 μm-core fiber thermistor can detect temperature variations of microscopic objects more reliably than a sheet-type thermistor with a substrate thickness of 60 μm. Using temperature simulations of both fiber- and sheet-type thermistors, we also confirmed that the equivalence of the rise and drop timescales (τr and τd) of the response was not influenced by undesirable heat flow to/from the substrates. It is very important for τd/τr to approach 1.0 and for the value of S to be reduced as much as possible, as τd/τr is proportional to log S. The ϕ15 μm-core fiber thermistor achieved a small τd/τr value of only 1.12. The rapid and accurate temperature responses of the ultrafine MCNC fiber thermistors make them promising candidates for microscopic temperature sensors.