As printed electronics is evolving towards applications in biosensing and wearables, the need of novel routes to fabricate flat, lightweight, stretchable conductors is increasing in importance. A suitable strategy for creating soft yet robust and stretchable interconnections in the aforementioned technological applications is to use print-related techniques to pattern conductors on top of elastomer substrates. In this study some thin elastomeric sheets – two forms of medical grade thermoplastic polyurethanes and a medical grade silicone – are considered as suitable substrates. Their mechanical, surface and moisture barrier properties -relevant for their application in soft and wearable electronics- are first investigated. VariousDFour different approaches are tested to pattern conductors, based on: screen printing of (i) conducting polymer (poly(3,4 ethylenedioxythiophene): polystyrene sulfonate, PEDOT:PSS), or (ii) stretchable Ag ink, and (iii) laser-scribing of Laser Induced Graphene (LIG). The electromechanical properties of these materials are thoroughly investigated by means of tensile testing and concurrent electrical measurements up to a maximum strain of 100%. Performance of the different stretchable conductors is compared and rationalized, evidencing the differences in onset and propagation of failure. Selected materials are then used in a proof of concept application as connectors for a wearable tattoo biosensor.

中文翻译：

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用于软和可穿戴电子产品的薄弹性体上的印刷和激光划线可拉伸导体

随着印刷电子产品向生物传感和可穿戴设备的应用发展，制造扁平、轻质、可拉伸导体的新途径的需求越来越重要。在上述技术应用中创建柔软但坚固且可拉伸的互连的合适策略是使用与印刷相关的技术在弹性体基板顶部图案化导体。在这项研究中，一些弹性薄板——两种形式的医用级热塑性聚氨酯和一种医用级有机硅——被认为是合适的基材。首先研究了它们的机械、表面和防潮性能——与它们在软和可穿戴电子产品中的应用相关。各种 D 测试了四种不同的方法来图案化导体，基于： (i) 导电聚合物 (poly(3, 4 亚乙基二氧噻吩）：聚苯乙烯磺酸盐，PEDOT:PSS），或 (ii) 可拉伸银墨水，和 (iii) 激光诱导石墨烯 (LIG) 的激光划线。这些材料的机电性能通过拉伸测试和同时进行的电气测量进行了彻底的研究，最大应变可达 100%。对不同可拉伸导体的性能进行了比较和合理化，证明了故障发生和传播的差异。然后将选定的材料用于概念验证应用，作为可穿戴纹身生物传感器的连接器。这些材料的机电性能通过拉伸测试和同时进行的电气测量进行了彻底的研究，最大应变可达 100%。对不同可拉伸导体的性能进行了比较和合理化，证明了故障发生和传播的差异。然后将选定的材料用于概念验证应用，作为可穿戴纹身生物传感器的连接器。这些材料的机电性能通过拉伸测试和同时进行的电气测量进行了彻底的研究，最大应变可达 100%。对不同可拉伸导体的性能进行了比较和合理化，证明了故障发生和传播的差异。然后将选定的材料用于概念验证应用，作为可穿戴纹身生物传感器的连接器。