UV-visible light reshaping of gold nanorods
UV-visible light reshaping of gold nanorods
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DOI：
10.1016/j.matchemphys.2010.01.048
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发表时间：
2010-05-15
影响因子：
4.6
通讯作者：
Al-Sherbini, El-Sayed A. M.
中科院分区：
文献类型：
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作者：
Al-Sherbini, El-Sayed A. M.
采用波长 620、560、520、460 nm 的二极管激光器和紫外光源照射，研究了通过在水或胶束水溶液中激光烧蚀和湿化学法制备的金纳米颗粒的光稳定性。结果表明，在胶束溶液中制备的金纳米粒子不受所有光源照射的影响，而在蒸馏水中激光烧蚀制备的金纳米粒子则观察到聚集体。这可能归因于封端胶束的稳定作用，其防止纳米粒子在照射过程中聚集。此外，对长宽比为2.6、3.1、3.6和3.8的金纳米棒进行紫外线照射，最大吸收波长分别为700、730、760和780 nm，导致颗粒形态和形状的变化以及棒的光分解。光分解速率随着纵横比的减小而降低，并且发现临界光分解发生在纵横比2.3+/-01处。这种降低是由金纳米棒周围的表面活性剂的溶解来解释的。 (C) 2010 Elsevier B.V. 保留所有权利。
The photostability of gold nanoparticles prepared via laser ablation in water or aqueous micellar solution and by wet chemical method was studied using irradiation from diode laser of wavelengths 620, 560, 520, 460 nm and UV-light sources. The results showed that gold nanoparticles prepared in micellar solution were not affected by irradiation from all light sources, whereas aggregates were observed in case of that prepared by laser ablation in distilled water. This may be attributed to the stabilizing role of the capping micelles which prevent nanoparticles from aggregation during the irradiation time course. Moreover, UV-irradiation of gold nanorods of aspect ratios 2.6, 3.1, 3.6, and 3.8 with absorption maxima at 700, 730, 760 and 780 nm, respectively, leads to a change in particles morphology and shape as well as photodecomposition of the rods. The rate of photodecomposition decreases with decreasing the aspect ratio and the critical photodecomposition was found to be at aspect ratio 2.3 +/- 01. The decreasing was explained by the dissolution of the surfactant around the gold nanorods. (C) 2010 Elsevier B.V. All rights reserved.