G1 dendrimers-mediated evolution of silver nanostructures from nanoparticles to solid spheres.
G1 dendrimers-mediated evolution of silver nanostructures from nanoparticles to solid spheres.
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DOI：
10.1016/s0021-9797(03)00122-x
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发表时间：
2003-05
影响因子：
9.9
通讯作者：
Ling-Li Li-Ling-Li-Li-47681414;Xu Cao;F. Yu;Z. Yao;Yi Xie
中科院分区：
文献类型：
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作者：
Ling-Li Li-Ling-Li-Li-47681414;Xu Cao;F. Yu;Z. Yao;Yi Xie
在G1聚氨基胺（PAMAM）的控制下，通过透射电镜（TEM）观察了稳定的胶体银在紫外线照射下还原硝酸银溶液，从离散的纳米颗粒到固体球体的演化过程。产物的形态与银离子浓度有关。提出了一种球形组装机制来解释纳米结构的演化。粉末x射线衍射图（XRD）、电子衍射图（ED）和x射线光电子能谱图（XPS）显示了立方对称银的存在。XPS和傅里叶变换红外光谱（FT-IR）证实了树状大分子参与了银纳米结构的稳定和控制。在紫外可见光谱中，表面强等离子体的中心分别位于425 nm和430 nm处，对应于圆点和实心球体的形状。固体微球对2,7-二氯荧光素（DCF）的还原表现出优异的催化效率。
With the control of G1 poly(amidoamine) (PAMAM), an evolutionary course of stable colloidal silver from discrete nanoparticles to solid spheres through ultraviolet irradiation reduction of silver nitrate solutions was observed by transmission electron microscopy (TEM). The morphologies of the products depend on the Ag+concentration. A mechanism of globular assembly was put forward to interpret the evolution of the nanostructures. Powder X-ray diffraction (XRD), electron diffraction (ED) patterns, and X-ray photoelectron spectroscopy (XPS) indicate the presence of cubic symmetry silver. XPS and Fourier transform infrared (FT-IR) spectroscopy confirm that dendrimers have participated in the stabilization and control of Ag nanostructures. In the UV–vis spectra, the intense surface plasmons are centered at 425 and 430 nm corresponding to the shapes of dots and solid spheres, respectively. The solid spheres exhibit excellent catalytic efficiency on the reduction of 2,7-dicholoroflurescein (DCF).