Wang Yue, Peng Suping, Zhu Shu, Wang Yuming, Qiang Zhe, Ye Changhuai, Liao Yaozu, Zhu Meifang
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Key Laboratory of Shanghai City for Lightweight Composites, Donghua University Center for Civil Aviation Composites, Donghua University, Shanghai 200051, China.
ACS Appl Mater Interfaces. 2021 Dec 8;13(48):57930-57942. doi: 10.1021/acsami.1c17170. Epub 2021 Nov 19.
Conductive composite inks are widely used in various applications such as flexible electronics. However, grand challenges still remain associated with their relatively low electrical conductivity and require heavy use of organic solvents, which may limit their high performance in broad applications and cause environmental concerns. Here, we report a generalized and eco-friendly strategy to fabricate highly conductive aqueous inks using silver nanowires (AgNWs) and biomass-derived organic salts, including succinic acid-chitosan (SA-chitosan) and sebacic acid-chitosan. SA-chitosan/AgNW composite coatings can be prepared by directly casting conductive aqueous inks on various substrates, followed by subsequently heating for cross-linking. The composite coatings exhibit an ultrahigh electrical conductivity up to 1.4 × 10 S/cm, which are stable after being treated with various organic solvents and/or kept at a high temperature of 150 °C, indicating their high chemical and thermal resistance. The flexibility and performance durability of these composite coatings were demonstrated by a suite of characterization methods, including bending, folding, and adhesion tests. Moreover, a high electromagnetic interference shielding (EMI) effectiveness of 73.3 dB is achieved for SA-chitosan/AgNW composite coatings at a thickness of only 10 μm due to the ultrahigh electrical conductivity. Additionally, we further demonstrated that such conductive composite inks can be used for fabricating functional textiles for a variety of applications with high performance, such as EMI shielding, Joule heating, and strain sensing. The robust and highly conductive inks prepared by this simple and environmental-friendly method hold great promise as important material candidates for the potential large-scale manufacturing of flexible and wearable electronics.
导电复合墨水广泛应用于诸如柔性电子等各种领域。然而，它们相对较低的电导率仍然带来巨大挑战，并且需要大量使用有机溶剂，这可能会限制其在广泛应用中的高性能表现，并引发环境问题。在此，我们报告一种通用且环保的策略，即使用银纳米线（AgNWs）和生物质衍生的有机盐（包括琥珀酸 - 壳聚糖（SA - 壳聚糖）和癸二酸 - 壳聚糖）来制备高导电水性墨水。SA - 壳聚糖/AgNW复合涂层可通过将导电水性墨水直接浇铸在各种基材上，随后加热进行交联来制备。该复合涂层表现出高达1.4×10 S/cm的超高电导率，在用各种有机溶剂处理后以及在150°C的高温下保持稳定，表明其具有高化学稳定性和热稳定性。通过一系列表征方法（包括弯曲、折叠和附着力测试）证明了这些复合涂层的柔韧性和性能耐久性。此外，由于超高电导率，SA - 壳聚糖/AgNW复合涂层在仅10μm的厚度下实现了73.3 dB的高电磁干扰屏蔽（EMI）效能。此外，我们进一步证明，这种导电复合墨水可用于制造具有高性能的各种功能性纺织品，如EMI屏蔽、焦耳加热和应变传感。通过这种简单且环保的方法制备的坚固且高导电的墨水，作为柔性和可穿戴电子产品潜在大规模制造的重要候选材料具有巨大潜力。
