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Highly Flexible Strain Sensors Based on CNT-Reinforced Ecoflex Silicone Rubber for Wireless Facemask Breathing Monitoring via Bluetooth
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-09-05 , DOI: 10.1021/acsapm.3c01689 Antonio del Bosque 1 , Xoan Xosé Fernández Sánchez-Romate 1 , Álvaro De La Llana Calvo 2, 3 , Pedro Rafael Fernández 2 , Susana Borromeo 2 , María Sánchez 1 , Alejandro Ureña 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-09-05 , DOI: 10.1021/acsapm.3c01689 Antonio del Bosque 1 , Xoan Xosé Fernández Sánchez-Romate 1 , Álvaro De La Llana Calvo 2, 3 , Pedro Rafael Fernández 2 , Susana Borromeo 2 , María Sánchez 1 , Alejandro Ureña 1
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Highly stretchable strain sensors based on carbon nanotube (CNT)-reinforced Ecoflex silicone rubber are developed for breathing monitoring purposes. The addition of CNTs promotes an improvement in electrical conductivity and mechanical properties (Young’s modulus and tensile strength) due to its good dispersion in Ecoflex. The evaluation of strain monitoring response, in both tensile and compression conditions, indicates a wide strain detection range and an ultrasensitive response at high strain levels, reaching a gauge factor of around 104 at 70% or 105 at 300% for 0.3 and 0.7 wt % CNT-reinforced sensors, respectively. They show a quite stable electrical response under 2000 cycling loads and different levels of frequencies. Moreover, the response and recovery times are in the range of milliseconds (∼600 and ∼800 ms, respectively). Finally, a proof-of-concept of wireless facemask breathing monitoring was carried out with Bluetooth Low Energy technology and a platform that has been developed to acquire, filter, visualize, and store the breathing signal. With this, the respiration rate can be unequivocally monitored as well as the difference between inspiration and expiration. Thus, this type of trial is proposed for breath monitoring in medical analysis, emergency teams, or first aid.
中文翻译：
基于 CNT 增强 Ecoflex 硅橡胶的高度灵活应变传感器，用于通过蓝牙进行无线面罩呼吸监测
基于碳纳米管 (CNT) 增强 Ecoflex 硅橡胶的高度可拉伸应变传感器专为呼吸监测目的而开发。由于碳纳米管在 Ecoflex 中具有良好的分散性，添加碳纳米管可促进导电性和机械性能（杨氏模量和拉伸强度）的改善。在拉伸和压缩条件下对应变监测响应的评估表明，在高应变水平下具有较宽的应变检测范围和超灵敏响应，对于 0.3 和 0.7，应变系数在 70% 时达到约 10 4 或在 300% 时达到10 5分别为 wt % CNT 增强传感器。它们在 2000 次循环负载和不同频率水平下表现出相当稳定的电气响应。此外，响应和恢复时间在毫秒范围内（分别为~600 和~800 毫秒）。最后，利用蓝牙低功耗技术和为采集、过滤、可视化和存储呼吸信号而开发的平台，进行了无线面罩呼吸监测的概念验证。这样，可以明确地监测呼吸速率以及吸气和呼气之间的差异。因此，此类试验建议用于医学分析、急救队或急救中的呼吸监测。
更新日期：2023-09-05
中文翻译：
基于 CNT 增强 Ecoflex 硅橡胶的高度灵活应变传感器，用于通过蓝牙进行无线面罩呼吸监测
基于碳纳米管 (CNT) 增强 Ecoflex 硅橡胶的高度可拉伸应变传感器专为呼吸监测目的而开发。由于碳纳米管在 Ecoflex 中具有良好的分散性，添加碳纳米管可促进导电性和机械性能（杨氏模量和拉伸强度）的改善。在拉伸和压缩条件下对应变监测响应的评估表明，在高应变水平下具有较宽的应变检测范围和超灵敏响应，对于 0.3 和 0.7，应变系数在 70% 时达到约 10 4 或在 300% 时达到10 5分别为 wt % CNT 增强传感器。它们在 2000 次循环负载和不同频率水平下表现出相当稳定的电气响应。此外，响应和恢复时间在毫秒范围内（分别为~600 和~800 毫秒）。最后，利用蓝牙低功耗技术和为采集、过滤、可视化和存储呼吸信号而开发的平台，进行了无线面罩呼吸监测的概念验证。这样，可以明确地监测呼吸速率以及吸气和呼气之间的差异。因此，此类试验建议用于医学分析、急救队或急救中的呼吸监测。
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