Poly(lactic acid)-Based Ink for Biodegradable Printed Electronics With Conductivity Enhanced through Solvent Aging
Poly(lactic acid)-Based Ink for Biodegradable Printed Electronics With Conductivity Enhanced through Solvent Aging
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DOI：
10.1021/acsami.0c05196
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发表时间：
2020-05-20
影响因子：
9.5
通讯作者：
Whiting, Gregory L.
中科院分区：
文献类型：
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作者：
Atreya, Madhur;Dikshit, Karan;Whiting, Gregory L.
生物可降解电子产品是一个快速发展的领域，开发适用于环境条件下增材制造的可控生物可降解、高导电性材料仍然是一个挑战。在这份报告中，可印刷的导电膏，采用聚（乳酸）（PLA）作为粘合剂和钨作为导体进行了演示。这些复合导体可以在可能存在水分的应用中提供增强的稳定性，例如环境监测或农业。使用溶剂老化技术对印刷迹线进行后处理可将其电导率提高多达2个数量级，最终电导率接近5000 S/m。当包括加热或激光烧结的热过程受到典型的可生物降解基材的温度约束的限制时，这种技术可以证明是有用的。加速氧化和水解降解的印刷复合导体进行检查，和一个完全可生物降解的电容式土壤水分传感器的制造和测试。
Biodegradable electronics is a rapidly growing field, and the development of controllably biodegradable, high-conductivity materials suitable for additive manufacturing under ambient conditions remains a challenge. In this report, printable conductive pastes that employ poly(lactic acid) (PLA) as a binder and tungsten as a conductor are demonstrated. These composite conductors can provide enhanced stability in applications where moisture may be present, such as environmental monitoring or agriculture. Post-processing the printed traces using a solvent-aging technique increases their conductivity by up to 2 orders of magnitude, with final conductivities approaching 5000 S/m. Such techniques could prove useful when thermal processes including heating or laser sintering are limited by the temperature constraints of typical biodegradable substrates. Both accelerated oxidative and hydrolytic degradation of the printed composite conductors are examined, and a fully biodegradable capacitive soil moisture sensor is fabricated and tested.