Biodegradable and Highly Deformable Temperature Sensors for the Internet of Things
Biodegradable and Highly Deformable Temperature Sensors for the Internet of Things
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DOI：
10.1002/adfm.201702390
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发表时间：
2017-09-20
影响因子：
19
通讯作者：
Troster, Gerhard
中科院分区：
文献类型：
--
作者：
Salvatore, Giovanni A.;Sulzle, Jenny;Troster, Gerhard
生物材料，薄膜加工和纳米纤维的最新进展提供了设计具有新颖和独特功能的电子产品的机会，包括高机械稳定性和生物降解性，这与医疗植入物，环境传感器以及可穿戴和一次性设备有关。将可靠的电气性能与高机械变形和化学降解相结合仍然具有挑战性。这项工作报告了温度传感器，其材料成分能够完全生物降解，而布局和封装格式确保了10 ms的响应时间和稳定的操作，当设备被揉皱，折叠和拉伸高达10%时，电阻变化小于0.7%。镁微结构被可堆肥认证的柔性聚合物封装，该聚合物表现出小的膨胀率和约500 MPa的杨氏模量，其接近肌肉和软骨的杨氏模量。从单个传感器到阵列的设计扩展及其集成到由相同聚合物制成的流体设备上，为智能生物可降解系统提供了流动映射的途径。传感器的适当包装将溶解动力学调整到水中几天，而与蓝牙模块的连接展示了在食品跟踪和医疗手术后监测中具有200 mK分辨率勘探应用的无线操作。
Recent advances in biomaterials, thin film processing, and nanofabrication offer the opportunity to design electronics with novel and unique capabilities, including high mechanical stability and biodegradation, which are relevant in medical implants, environmental sensors, and wearable and disposable devices. Combining reliable electrical performance with high mechanical deformation and chemical degradation remains still challenging. This work reports temperature sensors whose material composition enables full biodegradation while the layout and ultrathin format ensure a response time of 10 ms and stable operation demonstrated by a resistance variation of less than 0.7% when the devices are crumpled, folded, and stretched up to 10%. Magnesium microstructures are encapsulated by a compostable-certified flexible polymer which exhibits small swelling rate and a Young's modulus of about 500 MPa which approximates that of muscles and cartilage. The extension of the design from a single sensor to an array and its integration onto a fluidic device, made of the same polymer, provides routes for a smart biodegradable system for flow mapping. Proper packaging of the sensors tunes the dissolution dynamics to a few days in water while the connection to a Bluetooth module demonstrates wireless operation with 200 mK resolution prospecting application in food tracking and in medical postsurgery monitoring.