Department of Mechanical Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea.
Nanotechnology. 2017 May 19;28(20):205205. doi: 10.1088/1361-6528/aa6cda. Epub 2017 Apr 12.
In this work, bimodal Cu nano-inks composed of two different sizes of Cu nanoparticles (NPs) (40 and 100 nm in diameter) were successfully sintered with a multi-pulse flashlight sintering technique. Bimodal Cu nano-inks were fabricated and printed with various mixing ratios and subsequently sintered by a flash light sintering method. The effects of the flashlight sintering conditions, including irradiation energy and pulse number, were investigated to optimize the sintering conditions. A detailed mechanism of the sintering of bimodal Cu nano-ink was also studied via real-time resistance measurement during the sintering process. The sintered Cu nano-ink films were characterized using x-ray photoelectron spectroscopy and scanning electron microscopy. From these results, it was found that the optimal ratio of 40-100 nm NPs was found to be 25:75 wt%, and the optimal multi-pulse flash light sintering condition (irradiation energy: 6 J cm, and pulse duration: 1 ms, off-time: 4 ms, and pulse number: 5) was found. The optimally sintered Cu nano-ink film exhibited the lowest resistivity of 5.68 μΩ cm and 5B adhesion level.
在这项工作中，成功地使用多脉冲闪光灯烧结技术将由两种不同尺寸的铜纳米粒子（NP）（直径为 40nm 和 100nm）组成的双模态 Cu 纳米油墨烧结在一起。制备了双模态 Cu 纳米油墨，并以不同的混合比进行打印，然后通过闪光烧结法进行烧结。研究了闪光灯烧结条件（包括辐照能量和脉冲数）的影响，以优化烧结条件。通过在烧结过程中的实时电阻测量，还研究了双模态 Cu 纳米油墨烧结的详细机理。使用 X 射线光电子能谱和扫描电子显微镜对烧结的 Cu 纳米油墨薄膜进行了表征。从这些结果中发现，40-100nm NPs 的最佳比例为 25:75wt%，最佳多脉冲闪光烧结条件（辐照能量：6J/cm，脉冲持续时间：1ms，关断时间：4ms，脉冲数：5）。最佳烧结的 Cu 纳米油墨薄膜表现出最低的电阻率为 5.68μΩcm 和 5B 附着力等级。
