纳米银导电墨水的制备及其在高精度柔性电路打印中的应用  

Preparation of Nano-silver Conductive Ink and Its Application in High-Precision Flexible Circuit Printing

作　　者：丁泽宇 罗书轩 何瑞博 吉雅欣 徐世杰 景鑫 张文彦 Ding Zeyu;Luo Shuxuan;He Ruibo;Ji Yaxin;Xu Shijie;Jing Xin;Zhang Wenyan(College of Chemistry&Materials Science,Northwest University,Xi’an 710127,China;Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education,Xi’an 710127,China)

机构地区：[1]西北大学化学与材料科学学院,陕西西安710127 [2]合成与天然功能分子教育部重点实验室,陕西西安710127

出　　处：《稀有金属材料与工程》2023年第10期3530-3538,共9页Rare Metal Materials and Engineering

基　　金：陕西省科技厅项目(2022GY-384;2022-LL-JBGS-07;2021LLRH-05-21;S2022-YD-QFY-0107)。

摘　　要：分别以银纳米颗粒和银纳米线为导电组分,以BYK-333为表面助剂、乙二醇为溶剂制备出2类喷墨打印型导电墨水,采用MICROPLTTER Ⅱ型微纳米沉积系统在柔性透明基底上打印了导电线路,研究了打印工艺、热烧结固化、封装等对2种打印电路的导电性、耐候性和抗弯折等性能的影响。结果表明,打印机喷头口径和墨水与基底接触角是决定导电电路线宽精度的关键因素,热烧结处理可以提高银纳米颗粒柔性电路的导电性,在160℃烧结30 min时,电阻率下降到16.4μΩ·cm,在空气中放置90 d后保持导电性能不变,1000次弯折后电阻率上升12.4%;随着打印次数增加,银纳米线打印电路的导电性不断增加,打印9次得到的打印直线单位电阻为88.9Ω/cm,而随着烧结温度和时间的增加电路导电性下降,PDMS封装可以极大地提高打印电路的稳定性,在空气中放置90 d或弯折1000次后导电性能保持不变,表明基于银纳米材料导电墨水及微纳米沉积系统可以实现高性能和高精度柔性电路的稳定打印。Two kinds of ink-jet printing conductive inks were prepared with silver nanoparticles and silver nanowires as conductive components,BYK-333 as surface additive and ethylene glycol as solvent,respectively.The conductive lines were printed on the flexible transparent substrate by MICROPLTTER Ⅱ micro-nano deposition system.The effects of printing process,thermal sintering and packaging on the conductivity,weather resistance and bending resistance of the two printed circuits were studied.The results show that the diameter of printer nozzle and the contact angle between ink and substrate are the key factors to determine the linewidth accuracy of conductive circuit.Thermal sintering treatment can improve the conductivity of silver nanoparticles flexible circuit.After sintering at 160℃ for 30 min,the resistivity decreases to 16.4μΩ·cm,keep the conductivity unchanged after being placed in the air for 90 d,and the resistivity increases by 12.4% after 1000 bendings;With the increase of printing times,the conductivity of the silver nanowire printing circuit continues to increase.The unit resistance of the printing line obtained by printing 9 times is 88.9Ω/cm.With the increase in sintering temperature and time,the conductivity of the circuit decreases.PDMS packaging can greatly improve the stability in the printing circuit.After being placed in the air for 90 d or bent for 1000 times,the conductivity remains unchanged.It shows that utilizing the conductive inks of silver nanomaterials and micro-nano deposition system can achieve stable printing of high-performance and high-precision flexible circuits.

关 键 词：银纳米颗粒 银纳米线 导电墨水 喷墨打印 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TN604[电子电信—电路与系统]