Wang Liyong, Wang Zhiwen, Bakhtiyari Ali Naderi, Zheng Hongyu
Centre for Advanced Laser Manufacturing (CALM), School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, Shandong, China.
Micromachines (Basel). 2020 Dec 11;11(12):1094. doi: 10.3390/mi11121094.
Laser-induced graphene (LIG) is an emerging technique for producing few-layer graphene or graphene-like material that has recently received increasing attention, due to its unique advantages. Subsequently, a variety of lasers and materials have been used to fabricate LIG using this technique. However, there is a lack of understanding of how different lasers (wavelengths) perform differently in the LIG conversion process. In this study, the produced LIG on polyimide (PI) under a locally water-cooled condition using a 10.6 μm CO infrared laser and a 355 nm ultraviolet (UV) laser are compared. The experimental investigations reveal that under the same UV and CO laser fluence, the ablation of PI show different results. Surface morphologies with micron-sized and nanometer pores were formed by the UV laser under different laser fluences, whereas micron-sized pores and sheet structure with fewer pores were produced by the CO laser. Energy dispersive spectrometry and three-dimensional topography characterization indicate that the photochemical effects were also involved in the LIG conversion with UV laser irradiation. It is also observed through experiments that the photothermal effect contributed to the formation of LIG under both lasers, and the LIG formed on PI substrates by the CO laser showed better quality and fewer layers.
激光诱导石墨烯（LIG）是一种用于制备少层石墨烯或类石墨烯材料的新兴技术，由于其独特优势，近年来受到越来越多的关注。随后，人们使用了各种激光和材料通过该技术来制备LIG。然而，对于不同激光（波长）在LIG转化过程中的表现差异，人们还缺乏了解。在本研究中，对在局部水冷条件下使用10.6μm CO红外激光和355nm紫外（UV）激光在聚酰亚胺（PI）上制备的LIG进行了比较。实验研究表明，在相同的UV和CO激光通量下，PI的烧蚀呈现出不同的结果。在不同激光通量下，UV激光形成了具有微米级和纳米级孔隙的表面形貌，而CO激光则产生了微米级孔隙和孔隙较少的片状结构。能量色散光谱和三维形貌表征表明，光化学效应也参与了UV激光辐照下的LIG转化过程。通过实验还观察到，光热效应在两种激光作用下均有助于LIG的形成，并且由CO激光在PI基底上形成的LIG质量更好且层数更少。
