一种可控制组成和尺寸的 Au-Ag 合金纳米粒子的方法。
A composition and size controllable approach for Au-Ag alloy nanoparticles.
机构信息
The Key Laboratory of Safety Science of Pressurized System (MOE), School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China.
出版信息
Nanoscale Res Lett. 2012 Apr 18;7(1):225. doi: 10.1186/1556-276X-7-225.
A capillary micro-reaction was established for the synthesis of Au-Ag alloy nanoparticles (NPs) with a flexible and controllable composition and grain size by tuning the synthesis temperature, the residence time, or the mole ratio of Au3+:Ag+. By extending the residence time from 5 to 900 s, enhancing the temperature from 120°C to 160°C, or decreasing the mole ratio of Au3+:Ag+ from 1:1 to 1:20, the composition of samples was changed continuously from Au-rich to Ag-rich. The particles became large with the increase of the residence time; however, synthesis temperatures showed less effect on the particle size change. The particle size of the Au-Ag alloy NPs with various composition could be kept by adjusting the mole ratio of Au3+:Ag+. TEM observation displayed that the as-obtained NPs were sphere-like with the smallest average size of 4.0 nm, which is half of those obtained by the traditional flask method.
建立了一种毛细管微反应体系，通过调节合成温度、停留时间或 Au3+：Ag+的摩尔比，灵活可控地合成具有不同组成和粒径的 Au-Ag 合金纳米粒子（NPs）。通过将停留时间从 5 秒延长至 900 秒、将温度从 120°C 升高至 160°C 或降低 Au3+：Ag+的摩尔比（从 1:1 至 1:20），可以连续改变样品的组成，使其从富 Au 变为富 Ag。随着停留时间的增加，颗粒会变大；然而，合成温度对粒径变化的影响较小。通过调节 Au3+：Ag+的摩尔比，可以控制具有不同组成的 Au-Ag 合金 NPs 的粒径。TEM 观察显示，所得到的 NPs 呈球形，平均粒径最小为 4.0nm，是传统瓶方法得到的 NPs 的一半。
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