Author Affiliations
Abstract
1 University of Natural Resources and Life Sciences, Vienna, Department of Bionanosciences, Muthgasse 11, 1190 Vienna, Austria
2 University of Vienna, Department of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria
A silver microelectrode with a diameter of 30 µm in an aqueous K2SO4 electrolyte was irradiated with 55 fs and 213 fs laser pulses. This caused the emission of electrons which transiently charged the electrochemical double layer. The two applied pulse durations were significantly shorter than the electron-phonon relaxation time. The laser pulse durations had negligible impact on the emitted charge, which is incompatible with multiphoton emission. On the other hand, the observed dependence of emitted charge on laser fluence and electrode potential supports the thermionic emission mechanism.
hot electron emission femtosecond laser laser electrochemistry silver electrode Opto-Electronic Advances
2023, 6(6): 220170
江苏大学机械工程学院激光技术研究所, 江苏 镇江 212013
在所构建的纳秒脉冲激光电化学复合加工(LECM)系统中，利用激光辐照和脉冲电化学复合加工的方法，在相同的工艺参数下，分别对304不锈钢、7075铝合金、1060纯铝等金属和脆性材料硅进行了加工试验。探讨了激光热力效应促进电化学加工的机理，并对不同金属材料的极化曲线进行了测量。通过扫描电子显微镜(SEM)对比分析了不同材料复合加工表面的微观形貌；并通过超景深三维显微镜对不同材料的加工深度、宽度与深宽比进行了分析。试验结果表明，在激光热力作用下，铝合金的电化学刻蚀质量和表面形貌较好，且可以加工出深宽比较大的微结构；脆性材料则存在微颗粒的冲击崩离。
激光技术 激光电化学 热力效应 极化曲线 加工形貌
