A composition and size controllable approach for Au-Ag alloy nanoparticles

作者：Sun, Li; Luan, Weiling^*; Shan, Yue Jin

来源：Nanoscale Research Letters, 2012, 7(1): 225.

DOI：10.1186/1556-276X-7-225

• Au-Ag alloy
• Nanoparticles
• Composition
• Size
• Micro-reaction method

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 degrees C to 160 degrees 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.

• 出版日期2012-4-18
• 单位华东理工大学