Abstract Highly conductive graphene nanoplatelet (GNP) inks for the rapid surface coating of diverse substrates are prepared by a simple ball-milling method. The method which employs direct yellow 50 (DY50) as a modifier is able to prepare a DY50-decorated GNP nanohybrid (GNP-DY50) from graphite with high production yield (∼100%), high conductivity (up to 3.5 × 104 S/m), high dispersion concentration and excellent film formation ability. The unique structure of DY50, i.e., a rigid, planar and conjugated diazo dye bearing four sulfonate groups, and its strong π-π and charge transfer interactions with exfoliated GNPs, are demonstrated responsible for the efficient synthesis of such GNPs. Very interestingly, the dispersion of 20 mg/mL GNP-DY50 in isopropanol produces a stable and viscous ink, which can achieve the formation of smooth, compact and strongly adhesive GNP coatings within several minutes on the surface of a variety of substrates, e.g., glass beads, copper wires, plastic films, porous sponges and plant leaves. The resulting GNP coatings possess good mechanical property, high conductivity, favorable electrochemical behaviors and efficient electrothermal effects, which have potential applications in a wide range of fields including energy storage devices, electrochemical sensors, smart thin-film heaters and functional coatings.

中文翻译：

---

高产量球磨合成极其浓缩和高导电性的石墨烯纳米片油墨，用于各种基材的快速表面涂层

摘要 通过简单的球磨法制备了用于各种基材快速表面涂层的高导电石墨烯纳米片 (GNP) 油墨。采用直接黄 50 (DY50) 作为改性剂的方法能够以高产率 (~100%)、高电导率 (高达 3.5 × 104 S/ m)、高分散浓度和优异的成膜能力。DY50 的独特结构，即带有四个磺酸盐基团的刚性、平面和共轭重氮染料，以及它与剥离的 GNP 的强 π-π 和电荷转移相互作用，被证明是此类 GNP 的有效合成的原因。非常有趣的是，20 mg/mL GNP-DY50 在异丙醇中的分散会产生一种稳定而粘稠的墨水，可以实现平滑、几分钟内即可在各种基材（例如玻璃珠、铜线、塑料薄膜、多孔海绵和植物叶子）的表面上形成致密且附着力强的 GNP 涂层。所得的 GNP 涂层具有良好的机械性能、高电导率、良好的电化学行为和高效的电热效应，在储能器件、电化学传感器、智能薄膜加热器和功能涂层等广泛领域具有潜在应用。