Quantification of mass-specific laser energy input converted into particle properties during picosecond pulsed laser fragmentation of zinc oxide and boron carbide in liquids
Quantification of mass-specific laser energy input converted into particle properties during picosecond pulsed laser fragmentation of zinc oxide and boron carbide in liquids
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DOI：
10.1016/j.apsusc.2014.07.053
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发表时间：
2015-09-01
影响因子：
6.7
通讯作者：
Barcikowski, Stephan
中科院分区：
文献类型：
--
作者：
Lau, Marcus;Barcikowski, Stephan
脉冲激光在液体中破碎是一种通过烧蚀悬浮颗粒来制备有机、金属或半导体纳米颗粒的有效方法。然而，该过程的建模和放大缺乏对特定产品性质（如胶体的粒径或制造的纳米颗粒的带隙能量）所需的激光能量的量化。一种用于自由液体射流中的限定激光能量剂量的新颖设置使得能够实现脉冲激光破碎的质量比能量平衡和精确阈值确定。通过这种技术，激光能量和材料响应可以精确地关联。对于ZnO和B4 C颗粒的例子，已经观察到随着质量比激光能量输入的颗粒直径的线性减小和带隙能量的线性增加。通过密度梯度离心、电子显微镜、紫外-可见和X射线衍射分析晶体结构来分析趋势。该研究有助于定量模型参数放大，并提供了深入了解悬浮颗粒与脉冲激光源照射时发生的机制。(C)2014爱思唯尔有限公司版权所有。
Pulsed laser fragmentation in liquids is an effective method to fabricate organic, metal or semiconductor nanoparticles by ablation of suspended particles. However, modelling and up-scaling of this process lacks quantification of the laser energy required for a specific product property like particle diameter of the colloid or bandgap energy of the fabricated nanoparticles. A novel set-up for defined laser energy dose in a free liquid jet enables mass-specific energy balancing and exact threshold determination for pulsed laser fragmentation. By this technique laser energy and material responses can be precisely correlated. Linear decrease of the particle diameter and linear increase of the bandgap energy with mass-specific laser energy input has been observed for the examples of ZnO and B4C particles. Trends are analysed by density gradient centrifugation, electron microscopy, UV-vis and X-ray diffraction analysis of the crystal structure. The study contributes to quantitative model parameters for up-scaling and provides insight into the mechanisms occurring when suspended particles are irradiated with pulsed laser sources. (C) 2014 Elsevier B.V. All rights reserved.