研究目的
Investigating the optical properties of gold nanoparticle assemblies through simulation to understand the contribution of different structures to the experimentally measurable extinction spectra during particle clustering.
研究成果
The simulations demonstrated that the optical response of gold nanoparticle assemblies is highly sensitive to the interparticle gap, with different spectral shaping achievable even for the same type of cluster. This highlights the importance of experimental design in nanoparticle synthesis and surface modification, as large surface molecules might limit achievable coupling or spectral band in certain applications.
研究不足
The study acknowledges that for smaller sized particles with separations below 0.5 nm, the calculated spectra neglect non-local effects, allowing only qualitative conclusions. Additionally, the computational time increases with the number of particles, especially for longer chains and 3D clusters.
1：Experimental Design and Method Selection:
The study used boundary element method (BEM) for simulating the optical response of gold nanoparticle assemblies. The MNPBEM toolbox in Matlab? was utilized for these simulations.
2：Sample Selection and Data Sources:
Gold nanoparticles with diameters of 18 and 40 nm were modeled in different assemblies (linear chains, 2D arrays, and 3D clusters). The interparticle distance was varied based on earlier work.
3：List of Experimental Equipment and Materials:
The simulations were performed using Matlab? with the MNPBEM toolbox. The dielectric function from Johnson and Christy was used for gold particles, and the embedding medium was set to water.
4：Experimental Procedures and Operational Workflow:
The nanoparticle surface was discretized using triangles, with each nanoparticle surface subdivided using 400 vertices. The simulations considered different geometries and interparticle distances.
5：Data Analysis Methods:
The extinction spectra were analyzed to understand the optical response of different nanoparticle assemblies. Near-field calculations were also performed to investigate the coupled modes.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
