Najafi Maedeh, Forestier Emilie, Safarpour Milad, Ceseracciu Luca, Zych Arkadiusz, Bagheri Ahmad, Bertolacci Laura, Athanassiou Athanassia, Bayer Ilker
Smart Materials, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genoa, Italy.
iCub Tech, Istituto Italiano di Tecnologia, Via S. Quirico 9d, 16163, Genoa, Italy.
Sci Rep. 2024 May 14;14(1):10988. doi: 10.1038/s41598-024-60315-z.
Investigating biodegradable and biocompatible materials for electronic applications can lead to tangible outcomes such as developing green-electronic devices and reducing the amount of e-waste. The proposed emulsion-based conducting ink formulation takes into consideration circular economy and green principles throughout the entire process, from the selection of materials to the production process. The ink is formulated using the biopolymer polylactic acid dissolved in a sustainable solvent mixed with water, along with conductive carbon nanotubes (CNTs) and silver flakes as fillers. Hybrid conductive fillers can lower the percolation threshold of the ink and the production costs, while maintaining excellent electrical properties. The coating formed after the deposition of the ink, undergoes isothermal treatment at different temperatures and durations to improve its adhesion and electrical properties. The coating's performance was evaluated by creating an eight-finger interdigitated sensor using a Voltera PCB printer. The sensor demonstrates exceptional performance when exposed to various loading and unloading pressures within the 0.2-500.0 kPa range. The results show a consistent correlation between the change in electrical resistance and the stress caused by the applied load. The ink is biodegradable in marine environments, which helps avoiding its accumulation in the ecosystem over time.
研究用于电子应用的可生物降解和生物相容性材料能够带来切实的成果，例如开发绿色电子设备和减少电子垃圾的数量。所提出的基于乳液的导电油墨配方在从材料选择到生产过程的整个过程中都考虑到了循环经济和绿色原则。该油墨是通过将生物聚合物聚乳酸溶解在与水混合的可持续溶剂中，并加入导电碳纳米管（CNT）和银片作为填料来配制的。混合导电填料可以降低油墨的渗流阈值和生产成本，同时保持优异的电性能。油墨沉积后形成的涂层在不同温度和持续时间下进行等温处理，以改善其附着力和电性能。通过使用Voltera PCB打印机创建一个八指叉指式传感器来评估涂层的性能。当传感器暴露在0.2 - 500.0 kPa范围内的各种加载和卸载压力下时，表现出卓越的性能。结果表明，电阻变化与施加负载引起的应力之间存在一致的相关性。该油墨在海洋环境中可生物降解，这有助于避免其随着时间的推移在生态系统中积累。
