Fabrication of gold and silver nanoparticles with pulsed laser ablation under pressurized CO2
Fabrication of gold and silver nanoparticles with pulsed laser ablation under pressurized CO2
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DOI：
10.1088/2043-6262/4/4/045011
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发表时间：
2013-12-01
影响因子：
2.1
通讯作者：
Goto, Motonobu
中科院分区：
文献类型：
--
作者：
Machmudah, Siti;Wahyudiono;Goto, Motonobu
脉冲激光烧蚀（PLA）已成为光子学、电子学和医学领域纳米团簇合成的一种很有前途的方法。本文将加压CO2中的聚乳酸应用于金、银纳米颗粒的制备。在不同压力（0.1 ~ 20mpa）、不同温度（40 ~ 80℃）CO2介质和不同烧蚀时间（1500 ~ 9000 s）下，以532 nm激发波长进行激光烧蚀。实验结果表明，CO2浓度的变化对金（Au）和银（Ag）纳米粒子的结构有显著的影响。随着烧蚀时间的延长，金、银纳米颗粒的结构也发生了变化。通过在硅片上制备的金纳米结构颗粒的场发射扫描电镜（FE-SEM）图像可以看出，制备的金纳米颗粒具有网状结构。用银片制备的颗粒形貌与此相似。银颗粒中含有直径从5 nm到1.2 μ m不等的纳米颗粒。纳米颗粒的制备机理如下：较大的金/银颗粒在烧蚀过程中熔化，然后喷射出较小的球形纳米颗粒，这些纳米颗粒附着在熔融颗粒上形成纳米团簇。
Pulsed laser ablation (PLA) has become a promising method for the synthesis of nanoclusters for photonics, electronics and medicine. In this work PLA in pressurized CO2 has been applied for fabrication of gold and silver nanoparticles. Laser ablation was performed with an excitation wavelength of 532 nm under various pressures (0.1-20MPa), temperatures (40-80 degrees C) of CO2 medium and ablation times (1500-9000 s). On the basis of the experimental result, it follows that structures of gold (Au) and silver (Ag) nanoparticles were significantly affected by the changes in CO2 density. The structures of gold and silver nanoparticles also changed with an increase of ablation time. From a field-emission scanning electron microscopy (FE-SEM) image of the fabricated gold nano-structured particles on silicon wafer, it was seen that a network structure of smaller gold particles was fabricated. A similar morphology of particles fabricated from silver plate was observed. Silver particles contain nanoparticles with large-varied diameter ranging from 5 nm to 1.2 mu m. The mechanism of nanoparticles fabrication could be observed as follows. Bigger gold/silver particles melted during the ablation process and then ejected smaller spherical nanoparticles, which formed nanoclusters attached on the molten particles.