Wu Wenjie, Maye Mathew M
Department of Chemistry, Syracuse University, 111 College Place, Syracuse, New York 13244 (USA).
Chemphyschem. 2014 Aug 25;15(12):2582-7. doi: 10.1002/cphc.201402082. Epub 2014 May 30.
The surface plasmon resonance (SPR) properties of Au/Au(x)Ag(1-x) core/alloy nanoparticles (NPs) have been investigated by means of the discrete dipole approximation. The core/alloy microstructure was varied by changing the shell alloy composition x, its thickness t(S), and the shell thickness to core radius ratio (t(S)/r(C)) in the range of 0.05-1.0. These changes resulted in a novel tuning of SPR shape, frequency, and extinction. These models were compared with experimental results for Au/Au(x)Ag(1-x) NPs prepared by a microwave-mediated hydrothermal processing method, which produces core/alloy NPs with SPR signatures closely resembling those of the models.
通过离散偶极近似法研究了金/金（x）银（1 - x）核/合金纳米颗粒（NPs）的表面等离子体共振（SPR）特性。通过改变壳层合金成分x、壳层厚度t(S)以及壳层厚度与核半径之比（t(S)/r(C)）（范围为0.05 - 1.0）来改变核/合金微观结构。这些变化导致了SPR形状、频率和消光的新型调谐。将这些模型与通过微波介导水热法制备的金/金（x）银（1 - x）纳米颗粒的实验结果进行了比较，该方法制备的核/合金纳米颗粒的SPR特征与模型的SPR特征非常相似。
