Abstract A highly conductive environmental benign strategy for even coating of metal ion is of the great demand for various applications. This article proposes a nature originated polyphenol-Tannic acid (TA) based method for uniform coating of silver (Ag) on the surface of polyurethane (PU) sponge for synthesizing conductive composite. Solution-processed layer-by-layer (LbL) coating technique has been developed for fabricating Ag coated PU sponge that is performed at room temperature, avoiding the requirement of harsh and unstable conditions. The developed Ag nanocoated PU sponges are then successfully utilized to serve as a compressive strain sensor. The sensor offered the good performances under repeated cycles of compression, a significant change in the resistivity has been observed under various applied loads. The flexibility and sensitivity are further exploited and showed resistance signals upon certain human motions including bending of a finger, wrist, elbow, knee, throat, foot movements and speech recognition. The TA based LbL deposition of Ag in this paper could be generalized through depositing Ag nanocoating on diverse natural and synthetic substrates including paper, fabric, and latex. The developed process has a promising way for simple, facile, and eco-friendly synthesis of the conductive substrates and offers potential for scale-up production.

中文翻译：

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基于植物多酚的溶液处理沉积银导电涂层及其在人体运动检测传感器中的应用

摘要 一种用于金属离子均匀包覆的高导电环境良性策略对各种应用有着巨大的需求。本文提出了一种基于天然多酚-单宁酸 (TA) 的方法，用于在聚氨酯 (PU) 海绵表面均匀涂覆银 (Ag) 以合成导电复合材料。已开发出溶液处理逐层 (LbL) 涂层技术，用于制造在室温下进行的银涂层 PU 海绵，避免了苛刻和不稳定条件的要求。然后，开发的 Ag 纳米涂层 PU 海绵成功地用作压缩应变传感器。该传感器在重复压缩循环下提供良好的性能，在各种施加的负载下观察到电阻率的显着变化。进一步利用灵活性和敏感性，并在某些人类运动（包括弯曲手指、手腕、肘部、膝盖、喉咙、脚部运动和语音识别）时显示阻力信号。本文中基于 TA 的银 LbL 沉积可以通过在各种天然和合成基材（包括纸张、织物和乳胶）上沉积银纳米涂层来推广。所开发的工艺为简单、方便和环保的导电基材合成提供了一种有前途的方法，并为扩大生产提供了潜力。本文中基于 TA 的银 LbL 沉积可以通过在各种天然和合成基材（包括纸张、织物和乳胶）上沉积银纳米涂层来推广。所开发的工艺为简单、方便和环保的导电基材合成提供了一种有前途的方法，并为扩大生产提供了潜力。本文中基于 TA 的银 LbL 沉积可以通过在各种天然和合成基材（包括纸张、织物和乳胶）上沉积银纳米涂层来推广。所开发的工艺为简单、方便和环保的导电基材合成提供了一种有前途的方法，并为扩大生产提供了潜力。