Ding Su, Tian Yanhong, Jiu Jinting, Suganuma Katsuaki
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Harbin 150001 China
College of Materials and Environmental Engineering, Hangzhou Dianzi University Hangzhou 310036 China.
RSC Adv. 2018 Jan 9;8(4):2109-2115. doi: 10.1039/c7ra12738c. eCollection 2018 Jan 5.
Copper nanowire (CuNW) based flexible transparent electrodes have been extensively investigated due to their outstanding performances and low price. However, commonly used methods for processing CuNW transparent electrodes such as thermal annealing and photonic sintering inevitably damage the flexible substrates leading to low transmittance. Herein, a surface coating layer was demonstrated to protect the heat-sensitive polyethylene terephthalate (PET) polymer from being destroyed by the instantaneous high temperature during the photonic sintering process. The stable ceramic surface coating layer avoided the direct exposure of PET to intense light, further reduced the heat releasing to the bottom part of the PET, protecting the flexible PET base from destruction and ensuring high transparency for the CuNW transparent electrodes. A CuNW transparent electrode on surface coated PET (C-PET) substrates with a sheet resistance of 33 Ohm sq and high transmittance of 82% has been successfully fabricated by the photonic sintering method using light intensity of 557 mJ cm within several seconds in ambient conditions. The surface coating layers open a novel method to optimize the rapid photonic sintering technique for processing metal nanomaterials on heat-sensitive substrates.
基于铜纳米线（CuNW）的柔性透明电极因其卓越的性能和低廉的价格而受到广泛研究。然而，常用的处理CuNW透明电极的方法，如热退火和光子烧结，不可避免地会损坏柔性基板，导致透光率降低。在此，展示了一种表面涂层，以保护热敏聚对苯二甲酸乙二酯（PET）聚合物在光子烧结过程中不被瞬间高温破坏。稳定的陶瓷表面涂层避免了PET直接暴露于强光下，进一步减少了向PET底部释放的热量，保护柔性PET基底不被破坏，并确保CuNW透明电极具有高透明度。通过在环境条件下使用557 mJ/cm²的光强度在几秒钟内进行光子烧结法，成功制备了表面涂覆PET（C-PET）基板上的CuNW透明电极，其方阻为33 Ohm/sq，透光率高达82%。表面涂层为优化在热敏基板上加工金属纳米材料的快速光子烧结技术开辟了一种新方法。
