激光辐照下金-树枝状大分子纳米复合材料的形态变化
Morphological change of gold-dendrimer nanocomposites by laser irradiation.
作者信息
Esumi Kunio, Hayakawa Kazutaka, Yoshimura Tomokazu
机构信息
Department of Applied Chemistry and Institute of Colloid and Interface Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.
出版信息
J Colloid Interface Sci. 2003 Dec 15;268(2):501-6. doi: 10.1016/s0021-9797(03)00598-8.
Gold-dendrimer nanocomposites are prepared in aqueous solutions in the presence of poly(amidoamine)dendrimers (PAMAM) (generation 3 and 5) or poly(propyleneimine)dendrimers (PPI) (generation 3 and 4) by wet chemical NaBH(4) method. Thus prepared gold-dendrimer nanocomposites are irradiated by laser at 532 nm. UV-vis absorption spectroscopy and transmission electron microscopy reveal that the gold nanoparticles grow with the laser irradiation time as well as the fluence of the laser; in particular, the gold nanoparticles prepared at lower concentrations of PAMAM dendrimer as well as lower generations of PAMAM grow significantly. On the other hand, in the case of PPI dendrimers, the gold nanoparticles hardly grow by irradiation. In addition, dynamic light-scattering measurements show that the laser irradiation markedly promotes the association of the gold-PAMAM G3 dendrimer nanocomposites compared to that of the gold-PAMAM G5 dendrimer nanocomposites, while the sizes of association for the gold-PPI G3, G4 dendrimer nanocomposites hardly change by laser irradiation.
通过湿化学NaBH₄法，在聚（酰胺胺）树枝状大分子（PAMAM，第3代和第5代）或聚（丙烯亚胺）树枝状大分子（PPI，第3代和第4代）存在的水溶液中制备金树枝状大分子纳米复合材料。将如此制备的金树枝状大分子纳米复合材料用532 nm的激光进行照射。紫外-可见吸收光谱和透射电子显微镜显示，金纳米颗粒随激光照射时间以及激光能量密度而生长；特别是，在较低浓度的PAMAM树枝状大分子以及较低代数的PAMAM存在下制备的金纳米颗粒生长显著。另一方面，对于PPI树枝状大分子，通过照射金纳米颗粒几乎不生长。此外，动态光散射测量表明，与金-PAMAM G5树枝状大分子纳米复合材料相比，激光照射显著促进了金-PAMAM G3树枝状大分子纳米复合材料的缔合，而激光照射后金-PPI G3、G4树枝状大分子纳米复合材料的缔合尺寸几乎不变。
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