Conductive inks for the future printed electronics should have the following merits: high conductivity, flexibility, low cost, and compatibility with wide range of substrates. However, the state-of-the-art conductive inks based on metal nanoparticles are high in cost and poor in flexibility. Herein, we reported a highly conductive, low cost, and super flexible ink based on graphene nanoplatelets. The graphene ink has been screen-printed on plastic and paper substrates. Combined with postprinting treatments including thermal annealing and compression rolling, the printed graphene pattern shows a high conductivity of 8.81 × 10⁴ S m^–1 and good flexibility without significant conductivity loss after 1000 bending cycles. We further demonstrate that the printed highly conductive graphene patterns can act as current collectors for supercapacitors. The supercapacitor with the printed graphene pattern as the current collector and printed activated carbon as the active material shows a good rate capability of up to 200 mV s^–1. This work potentially provides a promising route toward the large-scale fabrication of low cost yet flexible printed electronic devices.

中文翻译：

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柔性印刷电子用高导电石墨烯油墨的丝网印刷

用于未来印刷电子产品的导电油墨应具有以下优点：高导电性，柔韧性，低成本以及与各种基材的相容性。然而，基于金属纳米颗粒的最新导电油墨成本高且柔韧性差。本文中，我们报道了一种基于石墨烯纳米片的高导电性，低成本和超柔韧性油墨。石墨烯油墨已经丝网印刷在塑料和纸质基材上。结合包括热退火和压延轧制的印后处理，所印制的石墨烯图案显示出8.81×10 ⁴ S m ^–1的高电导率和良好的柔韧性，在经过1000次弯曲后不会明显降低导电性。我们进一步证明，印刷的高导电性石墨烯图案可以充当超级电容器的集电器。具有印刷石墨烯图案作为集电器和印刷活性炭作为活性材料的超级电容器具有高达200 mV s ^–1的良好倍率能力。这项工作潜在地为大规模制造低成本但柔性的印刷电子设备提供了一条有希望的途径。