Hu Yang, Zhang An-Qi, Li Hui-Jun, Qian Dong-Jin, Chen Meng
Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China.
Nanoscale Res Lett. 2016 Dec;11(1):209. doi: 10.1186/s11671-016-1435-4. Epub 2016 Apr 19.
Water-soluble Ag-Au bimetallic nanostructures were prepared via co-reduction and seed-mediated growth routes employing poly-(4-styrenesulfonic acid-co-maleic acid) (PSSMA) as both a reductant and a stabilizer. Ag-Au alloy nanoparticles were obtained by the co-reduction of AgNO3 and HAuCl4, while Ag-Au core-shell nanostructures were prepared through seed-mediated growth using PSSMA-Au nanoparticle seeds in a heated AgNO3 solution. The optical properties of the Ag-Au alloy and core-shell nanostructures were studied, and the growth mechanism of the bimetallic nanoparticles was investigated. Plasmon resonance bands in the range 422 to 517 nm were observed for Ag-Au alloy nanoparticles, while two plasmon resonances were found in the Ag-Au core-shell nanostructures. Furthermore, discrete dipole approximation theoretical simulation was used to assess the optical property differences between the Ag-Au alloy and core-shell nanostructures. Composition and morphology studies confirmed that the synthesized materials were Ag-Au bimetallic nanostructures.
通过共还原法和种子介导生长法制备了水溶性Ag-Au双金属纳米结构，采用聚（4-苯乙烯磺酸-co-马来酸）（PSSMA）作为还原剂和稳定剂。通过AgNO₃和HAuCl₄的共还原获得Ag-Au合金纳米颗粒，而Ag-Au核壳纳米结构则是在加热的AgNO₃溶液中使用PSSMA-Au纳米颗粒种子通过种子介导生长法制备的。研究了Ag-Au合金和核壳纳米结构的光学性质，并研究了双金属纳米颗粒的生长机制。Ag-Au合金纳米颗粒在422至517nm范围内观察到等离子体共振带，而在Ag-Au核壳纳米结构中发现了两个等离子体共振。此外，采用离散偶极近似理论模拟来评估Ag-Au合金和核壳纳米结构之间的光学性质差异。组成和形态研究证实，合成材料为Ag-Au双金属纳米结构。
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