Ganash Entesar Ali, Altuwirqi Reem Mohammad
Physics Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Materials (Basel). 2021 Apr 30;14(9):2326. doi: 10.3390/ma14092326.
In this work, silver nanoparticles (Ag NPs) were synthesized using a chemical reduction approach and a pulsed laser fragmentation in liquid (PLFL) technique, simultaneously. A laser wavelength of 532 nm was focused on the as produced Ag NPs, suspended in an extract solution, with the aim of controlling their size. The effect of liquid medium concentration and irradiation time on the properties of the fabricated NPs was studied. While the X-ray diffraction (XRD) pattern confirmed the existence of Ag NPs, the UV-Vis spectrophotometry showed a significant absorption peak at about 420 nm, which is attributed to the characteristic surface plasmon resonance (SPR) peak of the obtained Ag NPs. By increasing the irradiation time and the extract concentration, the SPR peak shifted toward a shorter wavelength. This shift indicates a reduction in the NPs' size. The effect of PLFL on size reduction was clearly revealed from the transmission electron microscopy images. The PLFL technique, depending on experimental parameters, reduced the size of the obtained Ag NPs to less than 10 nm. The mean zeta potential of the fabricated Ag NPs was found to be greater than -30 mV, signifying their stability. The Ag NPs were also found to effectively inhibit bacterial activity. The PLFL technique has proved to be a powerful method for controlling the size of NPs when it is simultaneously associated with a chemical reduction process.
在这项工作中，同时采用化学还原法和液体中的脉冲激光破碎（PLFL）技术合成了银纳米颗粒（Ag NPs）。将波长为532 nm的激光聚焦于悬浮在提取液中的生成的Ag NPs上，以控制其尺寸。研究了液体介质浓度和辐照时间对所制备纳米颗粒性能的影响。X射线衍射（XRD）图谱证实了Ag NPs的存在，紫外可见分光光度法显示在约420 nm处有一个明显的吸收峰，这归因于所获得的Ag NPs的特征表面等离子体共振（SPR）峰。通过增加辐照时间和提取液浓度，SPR峰向较短波长移动。这种移动表明纳米颗粒尺寸减小。透射电子显微镜图像清楚地显示了PLFL对尺寸减小的影响。根据实验参数，PLFL技术将所获得的Ag NPs的尺寸减小到小于10 nm。所制备的Ag NPs的平均zeta电位大于-30 mV，表明其稳定性。还发现Ag NPs能有效抑制细菌活性。当PLFL技术与化学还原过程同时结合时，已证明它是一种控制纳米颗粒尺寸的有效方法。
