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Multi-modal sensing using photoactive thin films

机译：使用光敏薄膜的多模式传感

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摘要

The need for a reliable prognosis of the health of structural systems has promoted the development of sensing technologies capable of simultaneously detecting multiple types of damage. However, conventional sensors are designed to only measure a specific structural response (e.g., strain, displacement, or acceleration). This limitation forces one to use a wide variety of sensors densely instrumented on a given structure, which results in high overhead costs and requires extensive signal processing of raw sensor data. In this study, a photoactive thin film that has been engineered for multi-modal sensing to selectively detect strain and pH is proposed. In addition, the thin film is self-sensing in that it does not require external power to operate. Instead, light illumination causes the photoactive film to generate an electrical current, whose magnitude is directly related to applied strains (for deformations, impact or cracks) or pH (as a precursor of corrosion). First, the thin films were fabricated by spin-coating photoactive and conjugated polymers like poly(3-hexylthiophene) (P3HT). The thin film was also encoded with pH sensitivity by integrating polyaniline (PANI) as one component within the multilayered film architecture. Second, the optical response of the P3HT and PANI thin films subjected to applied strains or pH was characterized using absorption spectroscopy. Lastly, it was also verified that the thin films could selectively sense strain or pH depending on the wavelengths of light used for sensor interrogation.
机译：对结构系统健康状况进行可靠预测的需求促进了能够同时检测多种损坏类型的传感技术的发展。然而，常规传感器被设计成仅测量特定的结构响应（例如，应变，位移或加速度）。这种局限性迫使人们使用在给定结构上密集安装的多种传感器，这导致高昂的开销成本，并且需要对原始传感器数据进行大量的信号处理。在这项研究中，提出了一种已设计用于多模式传感以选择性检测应变和pH的光敏薄膜。另外，薄膜是自感应的，因为它不需要外部电源即可工作。取而代之的是，光照使光敏膜产生电流，该电流的大小与施加的应变（用于变形，冲击或破裂）或pH（作为腐蚀的前兆）直接相关。首先，通过旋涂光敏和共轭聚合物（如聚（3-己基噻吩）（P3HT））来制造薄膜。通过将聚苯胺（PANI）集成为多层膜结构中的一种组分，该薄膜还具有pH敏感性。第二，使用吸收光谱表征了施加应变或pH值的P3HT和PANI薄膜的光学响应。最后，还证实了薄膜可以根据用于传感器询问的光的波长来选择性地感测应变或pH。

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