Abstract

In past decades, stretchable conductors have been investigated for a wide range of applications, and the operation strain range of such devices varies by application. To commercialize stretchable devices, it is necessary to optimize the deformation of stretchable electrodes based on a given device elongation range. Therefore, we investigated the deformation mechanics of a silver nanowire (AgNW) electrode on an elastomeric substrate depending on its junction treatment method. At low-strain (< 15%), a thermally annealed AgNW electrode showed more stable resistance than a laser-welded AgNW electrode. Conversely, at high strain (> 20%), the thermally annealed AgNW electrode rapidly increased in resistance, while the laser-welded AgNW electrode showed lower resistivity change. By in situ surface analysis and a repetitive tensile test, we observed that the thermally annealed AgNW electrode shows less cracking at low strain but the laser-welded AgNW electrode exhibits fracturing of individual nanowires at low strain. Furthermore, at high strain, laser-welded AgNWs could slide to reduce stress during elongation, resulting in a smaller change in resistance compared to that of thermally annealed AgNW electrode. These results indicate that optimization of adhesion is necessary to fabricate stretchable devices based on deformation range.

Graphic Abstract

中文翻译：

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通过结处理优化操作范围的银纳米线

摘要

在过去的几十年中，已经对可拉伸导体进行了广泛的研究，并且这种设备的操作应变范围因应用而异。为了使可拉伸装置商业化，有必要基于给定的装置伸长范围来优化可拉伸电极的变形。因此，我们研究了银纳米线（AgNW）电极在弹性体衬底上的变形机理，具体取决于其结处理方法。在低应变（<15％）时，热退火的AgNW电极比激光焊接的AgNW电极具有更稳定的电阻。相反，在高应变（> 20％）下，热退火的AgNW电极的电阻迅速增大，而激光焊接的AgNW电极的电阻率变化较小。通过原位表面分析和反复拉伸试验，我们观察到，经热退火的AgNW电极在低应变下显示较少的裂纹，但是激光焊接的AgNW电极在低应变下显示出单个纳米线的断裂。此外，在高应变下，激光焊接的AgNW可以滑动以减小拉伸过程中的应力，与热退火的AgNW电极相比，电阻的变化较小。这些结果表明，基于变形范围，优化附着力对于制造可拉伸装置是必要的。与热退火的AgNW电极相比，电阻变化较小。这些结果表明，基于变形范围，优化附着力对于制造可拉伸装置是必要的。与热退火的AgNW电极相比，电阻变化较小。这些结果表明，基于变形范围，优化附着力对于制造可拉伸装置是必要的。

图形摘要