A new route to gold nanoflowers
A new route to gold nanoflowers
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DOI：
10.1088/1361-6528/aaaffd
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发表时间：
2018-05-04
期刊：
影响因子：
3.5
通讯作者：
Koetz, Joachim
中科院分区：
文献类型：
--
作者：
Liebig, Ferenc;Henning, Ricky;Koetz, Joachim
将阴离子表面活性剂双（2-乙基己基）磺基琥珀酸钠盐与阳离子表面活性剂十六烷基三甲基溴化铵混合，自发形成阴阳离子囊泡，用作还原介质，产生金簇，其嵌入并有序地进入模板相中。金簇可用作生长过程中的种子，随后通过添加抗坏血酸作为温和的还原组分。当在冰浴中非常缓慢地加入抗坏血酸时，产生了圆形边缘的金纳米花。当在室温下在Ag+离子的存在下进行相同的实验时，可以合成边缘尖锐的纳米花。纳米颗粒形成的机制可以理解为嵌入阴阳离子囊泡片段中的预定金纳米颗粒的非扩散限制的Ostwald熟化过程。表面增强拉曼散射实验表明，一个很好的增强因子为1.7。图10（5）示出了沉积在硅晶片上的纳米花。
Catanionic vesicles spontaneously formed by mixing the anionic surfactant bis(2-ethylhexyl)sulfosuccinate sodium salt with the cationic surfactant cetyltrimethylammonium bromide were used as a reducing medium to produce gold clusters, which are embedded and well-ordered into the template phase. The gold clusters can be used as seeds in the growth process that follows by adding ascorbic acid as a mild reducing component. When the ascorbic acid was added very slowly in an ice bath round-edged gold nanoflowers were produced. When the same experiments were performed at room temperature in the presence of Ag+ ions, sharp-edged nanoflowers could be synthesized. The mechanism of nanoparticle formation can be understood to be a non-diffusion-limited Ostwald ripening process of preordered gold nanoparticles embedded in catanionic vesicle fragments. Surface-enhanced Raman scattering experiments show an excellent enhancement factor of 1.7 . 10(5) for the nanoflowers deposited on a silicon wafer.