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Laser-induced graphitization of a forest-based ink for use in flexible and printed electronics
npj Flexible Electronics ( IF 14.6 ) Pub Date : 2020-08-06 , DOI: 10.1038/s41528-020-0080-2
Jesper Edberg , Robert Brooke , Omid Hosseinaei , Andreas Fall , Kosala Wijeratne , Mats Sandberg

Laser-induced graphitization (LIG) is a method of converting a carbon-rich precursor into a highly conductive graphite-like carbon by laser scribing. This method has shown great promise as a versatile and low-cost patterning technique. Here we show for the first time how an ink based on cellulose and lignin can be patterned using screen printing followed by laser graphitization. Screen printing is one of the most commonly used manufacturing techniques of printed electronics, making this approach compatible with existing processing of various devices. The use of forest-based materials opens the possibility of producing green and sustainable electronics. Pre-patterning of the ink enables carbon patterns without residual precursor between the patterns. We investigated the effect of the ink composition, laser parameters, and additives on the conductivity and structure of the resulting carbon and could achieve low sheet resistance of 3.8 Ω sq−1 and a high degree of graphitization. We demonstrated that the process is compatible with printed electronics and finally manufactured a humidity sensor which uses lignin as the sensing layer and graphitized lignin as the electrodes.



中文翻译:

用于柔性和印刷电子产品的森林油墨的激光诱导石墨化

激光诱导石墨化(LIG)是通过激光划线将富碳前体转化为高导电性类石墨碳的方法。这种方法作为一种通用且低成本的构图技术已显示出巨大的希望。在这里,我们首次展示了如何使用丝网印刷然后进行激光石墨化来对基于纤维素和木质素的油墨进行构图。丝网印刷是印刷电子产品最常用的制造技术之一,使这种方法与各种设备的现有处理兼容。使用基于森林的材料为生产绿色和可持续的电子产品提供了可能性。墨水的预构图可以形成碳图案,而在图案之间没有残留的前体。我们研究了墨水成分,激光参数,-1和高度石墨化。我们证明了该工艺与印刷电子产品兼容,并最终制造了一种湿度传感器,该湿度传感器使用木质素作为传感层,并使用石墨化木质素作为电极。

更新日期:2020-08-06
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