With the rise of the internet of things and applications such as smart packaging, the need for low cost, disposable temperature sensors with minimum environmental impact are critical. In this study, we report fully printed capacitive temperature sensors made from bio-degradable dielectric materials. All layers were aerosol jet printed and the areal capacitance was characterized at several temperatures between room temperature (22 ˚C) and 80 °C. Using a bilayer dielectric structure, a layer of poly (vinyl alcohol) (PVA) was encapsulated with polycaprolactone (PCL) through interfacial crosslinking to protect it against humidity. Various concentrations and layer amounts of PVA were investigated, with the most effective capacitors consisting of a single layer of PVA deposited from a 5.0 mg ml⁻¹ solution followed by a layer of the UV-crosslink-able PCL deposited from 2.0 mg ml⁻¹ solution, achieving a 43 ± 6% increase in areal capacitance at 80 °C when compared to room temperature, measured at a frequency of 501 Hz.

中文翻译：

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使用环保双层电介质的气溶胶喷射印刷温度传感器

随着物联网和智能包装等应用的兴起，对环境影响最小的低成本、一次性温度传感器的需求至关重要。在这项研究中，我们报告了由可生物降解介电材料制成的全印刷电容式温度传感器。所有层均采用气溶胶喷射印刷，并在室温 (22 °C) 和 80 °C 之间的多个温度下表征面积电容。采用双层介电结构，通过界面交联用聚己内酯（PCL）封装一层聚乙烯醇（PVA）以防止潮湿。研究了不同浓度和层数的 PVA，最有效的电容器由从 5.0 mg ml ^-1溶液沉积的单层 PVA 和随后从 2.0 mg ml ^-1溶液沉积的可 UV 交联的 PCL 层组成。与室温相比，在 501 Hz 频率下测量，80 °C 时的面积电容增加了 43 ± 6%。