Size-regulated gold nanoparticles fabricated by a discharge in reverse micelle solutions
Size-regulated gold nanoparticles fabricated by a discharge in reverse micelle solutions
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DOI：
10.1016/j.surfcoat.2008.06.092
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发表时间：
2008-08
影响因子：
5.4
通讯作者：
J. Hieda;N. Saito;O. Takai
中科院分区：
文献类型：
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作者：
J. Hieda;N. Saito;O. Takai
放电施加到反胶束溶液，提供恒定体积的纳米反应器，合成尺寸调节的金纳米粒子。改变水与表面活性剂W的摩尔比以调节纳米颗粒尺寸。采用脉冲电源在反胶束溶液中产生放电。工作电压为960 V，脉冲宽度为2 μs，频率为15 kHz。用透射电子显微镜（TEM）观察了合成的金纳米粒子。利用紫外-可见光谱（UV-Vis）测量了金纳米粒子的表面等离子体吸收带。TEM图像表明，随着W的增加，平均粒径在3.8至11 nm之间变化。因此，金纳米粒子的尺寸可以通过反胶束溶液中水滴的体积来调节。[AuCl 4]−离子的还原和金纳米粒子的形成仅在由反胶束形成的水滴内进行。这些由反胶束调控的纳米反应器导致金纳米颗粒的均匀生长。
A discharge was applied to reverse micelle solutions, which provided constant volume nanoreactors, to synthesize size-regulated gold nanoparticles. The molar ratio of water to surfactant, W, was varied to regulate the nanoparticle size. A pulsed power supply was used to generate the discharge in the reverse micelle solutions. The applied voltage, pulse width, and frequency were 960 V, 2 μs, and 15 kHz, respectively. The synthesized gold nanoparticles were observed by transmission electron microscopy (TEM). Surface plasmon absorption band of the gold nanoparticles was measured by ultraviolet-visible (UV–Vis) spectroscopy. TEM images showed that the average particle size varied from 3.8 to 11 nm in diameter as W was increased. Thus, the size of gold nanoparticles can be regulated by the volume of water droplets in the reverse micelle solutions. Reduction of [AuCl4]−ions and formation of gold nanoparticles proceeded only inside the water droplets formed by reverse micelles. These nanoreactors regulated by reverse micelles lead to the uniform growth of gold nanoparticles.