Three-dimensional (3D) printed highly conductive graphene-based nanocomposites have led to a paradigm shift in the development of flexible electronics as well as customized therapeutic devices. This article addresses the deployment and characterization of a piezoelectric-pneumatic material-jetting (PPMJ) additive manufacturing process to print graphene-based nanocomposites with 3D structures. Here, development of a graphene-silicone ink, so-called MJ-3DG, with a high content of graphene (70 wt%) and its adoption for the PPMJ process to 3D print a highly conductive graphene-silicone structure is demonstrated. The robust 3D printed structure from MJ-3DG ink with the surface roughness around 2.99 (μm) has the resistivity as low as 0.41 (Ω.cm). This low resistivity is fairly comparable with the previously reported extrusion-based 3D-printed graphene structures that are the highest among all the carbon-based 3D-printed structures reported to date. Furthermore, in contrast to the extrusion-based systems, the high process speed (up to 500 mm/s) and the drop-on-demand nature of PPMJ provide internal design flexibility for 3D printed structures and make the development of smart graphene-based electronic and biomonitoring devices possible.

三维（3D）打印的高导电性石墨烯基纳米复合材料已导致柔性电子产品以及定制治疗设备的开发发生了范式转变。本文介绍了压电-气动材料喷射（PPMJ）增材制造工艺的部署和特性，以打印具有3D结构的基于石墨烯的纳米复合材料。在此，说明了石墨烯含量高（70 wt％）的石墨烯-有机硅油墨（所谓的MJ-3DG）的开发及其在PPMJ工艺中3D打印高导电性石墨烯-有机硅结构的采用。由MJ-3DG墨水制成的坚固的3D打印结构，其表面粗糙度约为2.99（μm），电阻率低至0.41（Ω.cm）。这种低电阻率与以前报道的基于挤压的3D打印的石墨烯结构相当，后者是迄今为止报道的所有基于碳的3D打印的结构中最高的。此外，与基于挤出的系统相比，PPMJ的高处理速度（高达500 mm / s）和按需滴落特性为3D打印结构提供了内部设计灵活性，并推动了基于智能石墨烯的开发电子和生物监测设备。