导电油墨是印刷电子技术中使用的关键电子材料,而导电填料作为导电油墨的主要成分要求其化学性能稳定且电导率高.其中,基于石墨烯的导电油墨因为其优异的电学性质受到广泛关注.本研究采用直流电弧放电法制备的石墨烯作为导电填料,并通过扫描电子显微镜、透射电子显微镜、拉曼光谱等手段对制备的石墨烯进行了表征.结果表明:直流电弧放电法制备的石墨烯为2～10层、尺寸在100～200 nm范围且纯度高、结晶性好.在此基础上,研究了涂层厚度、热处理温度以及弯曲角度等对石墨烯导电油墨导电性能的影响.研究发现,石墨烯导电油墨电阻率与涂层厚度、热处理温度成反比,且随着厚度、温度的增加石墨烯导电油墨的电阻率逐渐降低.并且样品在柔性基底上经过不同角度的弯曲折叠后电阻率没有明显变化.当厚度为170 μm的样品经过360℃(30 min)热处理后,石墨烯导电油墨的电阻率仅为0.003 Ω·cm.上述结果表明,电弧法制备的石墨烯导电油墨有望成为未来印制电子领域的关键材料.
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