Quan Ying-Jun, Kim Young-Gyun, Kim Min-Soo, Min Soo-Hong, Ahn Sung-Hoon
Institute of Advanced Machines and Design, Seoul National University, Seoul 08826, Republic of Korea.
Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Republic of Korea.
ACS Nano. 2020 May 26;14(5):5392-5399. doi: 10.1021/acsnano.9b08953. Epub 2020 Apr 15.
Structural colors that can be changed dynamically, using either plasmonic nanostructures or photonic crystals, are rapidly emerging research areas for stretchable sensors. Despite the wide applications of various techniques to achieve strain-responsive structural colors, important factors in the feasibility of strain sensors-such as their sensing mechanism, stability, and reproducibility-have not yet been explored. Here, we introduce a stretchable, diffractive, color-based wireless strain sensor that can measure strain using the entire visible spectrum, based on an array of cone-shaped nanostructures on the surface of an elastomeric substrate. By stretching or compressing the substrate, the diffractive color can be tuned according to the changing grating pitch. Using the proposed method, we designed three types of strain-sensing modes: large-deformation (maximum 100%) tensile strain, biaxial 2D strain, and shear strain (maximum 78%). The strain sensors were fabricated, and applicability to strain-sensing was evaluated.
利用等离激元纳米结构或光子晶体可实现动态变化的结构色，这是可拉伸传感器领域迅速兴起的研究方向。尽管实现应变响应结构色的各种技术应用广泛，但应变传感器可行性的重要因素，如传感机制、稳定性和可重复性等，尚未得到探索。在此，我们介绍一种可拉伸、基于衍射色的无线应变传感器，它基于弹性体基底表面的锥形纳米结构阵列，能够利用整个可见光谱测量应变。通过拉伸或压缩基底，衍射色可根据光栅间距的变化进行调节。利用所提出的方法，我们设计了三种应变传感模式：大变形（最大100%）拉伸应变、双轴二维应变和剪切应变（最大78%）。制备了应变传感器，并评估了其在应变传感方面的适用性。
