State Key Laboratory of Plastic Forming Simulation and Die and Mold Technology, Huazhong University of Science and Technology, Wuhan, Hubei, People's Republic of China.
Nanotechnology. 2010 Jan 15;21(2):025607. doi: 10.1088/0957-4484/21/2/025607. Epub 2009 Dec 3.
Silver nanostructures have been synthesized via a microwave-assisted polyol method by adding sodium sulfide (Na(2)S) into the solution. An interesting morphology evolution can be observed by adjusting the concentration of Na(2)S and the heating power. It is found that the ideal concentration of Na(2)S is 31.25-500 microM for the fast reduction of Ag(+) at 300 W under optimal conditions for producing monodispersed silver nanocubes. When the heating power is increased to 400 W, 62.5-250 microM is the ideal concentration of Na(2)S for the synthesis of silver nanocubes. On increasing the concentration of Na(2)S (>500 microM), a mixture of silver nanowires, nanocubes, bipyramids, and irregular/quasispherical particles is synthesized at 300 and 400 W. In particular, an increase in the concentration of Na(2)S to 750 microM at 400 W leads to the production of a quantity of silver nanowires. In addition, silver nanocubes with controllable sizes can be obtained by changing the concentration of Na(2)S and the heating power. Compared to traditional wet-chemical methods, this method has the advantage of a marked decrease in reaction time to 3.5 min. Finally, our work provides a simple strategy for fabricating silver nanostructures with controllable morphologies and sizes.
通过在溶液中添加硫化钠 (Na(2)S)，采用微波辅助多元醇法合成了银纳米结构。通过调整 Na(2)S 的浓度和加热功率，可以观察到有趣的形态演变。研究发现，在 300 W 下，当加热功率为 300 W 且条件最佳以产生单分散银纳米立方体时，Na(2)S 的理想浓度为 31.25-500 microM，可快速还原 Ag(+)。当加热功率增加到 400 W 时，Na(2)S 的理想浓度为 62.5-250 microM，用于合成银纳米立方体。当 Na(2)S 的浓度增加 (>500 microM)时，在 300 和 400 W 下合成了银纳米线、纳米立方体、双锥和不规则/准球形颗粒的混合物。特别是，在 400 W 下将 Na(2)S 的浓度增加到 750 microM 会导致大量银纳米线的产生。此外，通过改变 Na(2)S 的浓度和加热功率，可以获得具有可控尺寸的银纳米立方体。与传统的湿化学方法相比，这种方法的反应时间明显缩短至 3.5 分钟。最后，我们的工作为制备具有可控形貌和尺寸的银纳米结构提供了一种简单的策略。
