Feng Jiayun, Wang Zhiyuan, Wu Zhuohuan, Wang Shujun, Sun Yuxin, Meng Qi, Wen Jiayue, Wang Shang, Tian Yanhong
State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China.
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450041, China.
Materials (Basel). 2025 Jul 19;18(14):3393. doi: 10.3390/ma18143393.
In this article, femtosecond laser scanning was used to create heterojunctions between silver nanowire (Ag NW) and graphene oxide (GO), resulting in a mechanical and electrical interconnection. Surface plasmon resonances (SPRs) were generated on the nanowire surface by using femtosecond laser irradiation, producing a periodically excited electric field along the Ag NWs. This electric field then interfered with the femtosecond laser field, creating strong localized heating effects, which melted the Ag NW and GO, leading to mechanical bonding between the two. The formation of these heterostructures was attributed to the transfer of plasmon energy from the Ag NW to the adjacent GO surface. Since the connection efficiency of the nanowires is closely related to the specific location and the polarization direction of the laser, FDTD simulations were conducted to model the electric field distribution on the surface of Ag NW and GO structures under different laser polarization directions, varying the lengths and diameters of the nanowires. Finally, the resistance changes of the printed Ag NW paths on the GO thin film after femtosecond laser irradiation were investigated. It was found that laser bonding could reduce the resistance of the Ag NW-GO heterostructures by two orders of magnitude, further confirming the formation of the junctions.
在本文中，利用飞秒激光扫描在银纳米线（Ag NW）和氧化石墨烯（GO）之间创建异质结，从而实现机械和电气互连。通过飞秒激光辐照在纳米线表面产生表面等离子体共振（SPR），沿Ag NW产生周期性激发电场。然后该电场与飞秒激光场相互干涉，产生强烈的局部加热效应，使Ag NW和GO熔化，导致两者之间形成机械键合。这些异质结构的形成归因于等离子体能量从Ag NW转移到相邻的GO表面。由于纳米线的连接效率与激光的特定位置和偏振方向密切相关，因此进行了有限时域差分（FDTD）模拟，以模拟不同激光偏振方向下Ag NW和GO结构表面的电场分布，并改变纳米线的长度和直径。最后，研究了飞秒激光辐照后GO薄膜上印刷的Ag NW路径的电阻变化。结果发现，激光键合可使Ag NW-GO异质结构的电阻降低两个数量级，进一步证实了结的形成。
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