Characteristics of Nanosecond Laser-Irradiated Damage inSingle-Layer Graphene on Fused Silica Substrate
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摘要: 采用化学气相沉积法在铜箔基底上生长单层石墨烯，利用湿化学方法将单层石墨烯转移到石英玻璃基底，获得石英基单层石墨烯样品。利用相衬显微镜和扫描电子显微镜，实验研究了单层石墨烯样品在紫外纳秒脉冲激光辐照下的损伤阈值和损伤概率，以及不同辐照通量下的典型微观结构。实验结果表明，单层石墨烯样品对550nm波长光的吸收率约为2.38%，与理论值2.3%接近。在波长为355nm、脉宽为5.8ns的条件下测得激光损伤阈值为78mJ/cm2。当辐照通量低于损伤阈值时，石墨烯样品表面有纳米碳球和碳花形成；当辐照通量等于损伤阈值时，石墨烯样品表面产生明显的多孔碳骨架烧蚀痕迹；当辐照通量高于损伤阈值时，则形成了特定的周期性折叠碳结构。Abstract: In this work, the chemical vapor deposition method was adopted to deposit a single-layer graphene on a copper foil, which was then transferred to a fused silica substrate using the wet chemical method.Then, using the phase-contrast microscopy and the scanning electron microscopy, we studied the damage threshold, the damage probability, the damage morphology and the microstructure of the as-prepared graphene layer irradiated by a nanosecond ultraviolet laser pulse.The experimental results show that the absorptivity of the single-layer graphene produced is 2.38% at 550nm, close to the theoretical value of 2.3%, and the measured laser-induced damage threshold is 78mJ/cm2 after irradiation with a wavelength of 355nm and a pulse width of 5.8ns.Moreover, we observed spherical carbon balls and carbon flowers in the laser-irradiated zone under relatively low fluence conditions, ablation framework of porous carbon at damage threshold fluence, and laser-induced nano-scale voids and folds of graphene under high-fluence laser irradiation.
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Key words:
- single layer graphene /
- pulsed ultraviolet laser /
- laser irradiation /
- damage threshold /
- microstructure
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图 1 单层石墨烯样品的透过率曲线
Figure 1. Transmittance curves of the as-preparedsingle-layer graphene samples
图 2 单层石墨烯样品的表面形貌和微观结构
Figure 2. Surface morphology and microstructure of the single-layer graphene sample
图 3 单层石墨烯样品的激光损伤阈值和损伤概率
Figure 3. Laser-induced damage threshold and damage probability of the single-layer graphene sample
图 4 单层石墨烯样品的激光损伤形貌
Figure 4. Laser-induced damage morphology of the single-layer graphene sample
图 5 单层石墨烯样品的激光损伤微观结构(F=33mJ/cm2)
Figure 5. Microstructure of the laser irradiated single-layer graphene sample (F=33mJ/cm2)
图 6 单层石墨烯样品的激光损伤微观结构(F=48mJ/cm2)
Figure 6. Microstructure of the laser irradiated single-layer graphene sample (F=48mJ/cm2)
图 7 单层石墨烯样品的激光损伤微观结构(F=78mJ/cm2)
Figure 7. Microstructure of the laser irradiated single-layer graphene sample (F=78mJ/cm2)
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