Laser-induced graphitization of a forest-based ink for use in flexible and printed electronics  

作　　者：Jesper Edberg Robert Brooke Omid Hosseinaei Andreas Fall Kosala Wijeratne Mats Sandberg 

机构地区：[1]RISE Bio-and Organic Electronics,Bredgatan 33,60221,Norrköping,Sweden [2]RISE Bioeconomy,Drottning Kristinas väg 61,11428,Stockholm,Sweden

出　　处：《npj Flexible Electronics》2020年第1期149-158,共10页npj-柔性电子（英文）

基　　金：We would like to acknowledge funding from Vinnova for the Digital Cellulose Competence Center(DCC),Diary number 2016-05193.

摘　　要：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 3.8Ωsq^(−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.

关 键 词：FOREST PRINTING ELECTRONICS 

分 类 号：TN2[电子电信—物理电子学]