Gradients for Metal Film-Based Strain
Posted on 06.08.2022 - 02:20
Metal film-based stretchable strain sensors hold great promise for applications in various domains, which require superior sensitivity-stretchability-cyclic stability synergy. However, the sensitivity-stretchability trade-off has been a long-standing dilemma and the metal film-based strain sensors usually suffer from weak cyclic durability, both of which significantly limit their practical applications. Here, we propose an extremely facile, low-cost and spontaneous strategy that incorporates topological gradients in metal film-based strain sensors, composed of intrinsic (grain size and interface) and extrinsic (film thickness and wrinkle) microstructures. The topological gradient strain sensor exhibits an ultrawide stretchability of 100% while simultaneously maintaining a high sensitivity at an optimal topological gradient of 4.5, due to the topological gradients-induced multistage film cracking. Additionally, it possesses a decent cyclic stability for >10 000 cycles between 0 and 40% strain enabled by the gradient-mixed metal/elastomer interfaces. It can monitor the full-range human activities from subtle pulse signals to vigorous joint movements.
CITE THIS COLLECTION
Zhu, Ting; Wu, Kai; Xia, Yun; Yang, Chao; Chen, Jiaorui; Wang, Yaqiang; et al. (2022): Topological Gradients for Metal Film-Based Strain Sensors. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.2c01967
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weak cyclic durabilityvigorous joint movementssubtle pulse signalsrange human activitiesdecent cyclic stabilitycyclic stability synergy10 000 cyclesbased strain sensorsincorporates topological gradientsrequire superior sensitivityoptimal topological gradienttopological gradientsstrain enabledvarious domainsstanding dilemmaspontaneous strategysimultaneously maintainingsignificantly limitmixed metalmetal filmhigh sensitivitygrain sizefilm thicknessextremely facileelastomer interfaces