An integrated experimental and theoretical study on the optical properties of uniform hairy noble metal nanoparticles

We report a viable route to plasmonic nanoparticles with well-controlled sizes, shapes, and compositions. A series of monodisperse Ag and Au nanoparticles capped with polystyrene chains (i.e., "hairy" nanoparticles) are crafted by capitalizing on star-like diblock copolymers as nanoreactor...

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Bibliographic Details
Published in:Nanoscale 2018-12, Vol.10 (48), p.22750-22757
Main Authors: Yang, Di, Chen, Yihuang, Peng, Hongshang, Chen, Gengxiang, Lin, Zhiqun
Format: Article
Language:English
Subjects:
Absorption spectra
Electromagnetic fields
Finite element method
Gold
Mathematical analysis
Nanoparticles
Noble metals
Optical properties
Polystyrene resins
Silver
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Summary:We report a viable route to plasmonic nanoparticles with well-controlled sizes, shapes, and compositions. A series of monodisperse Ag and Au nanoparticles capped with polystyrene chains (i.e., "hairy" nanoparticles) are crafted by capitalizing on star-like diblock copolymers as nanoreactors. Such monodisperse nanoparticles render an accurate absorption spectrum, providing a strong basis for theoretical investigation into their optical properties. By combining the experimental study with the three-dimensional finite element calculation of electromagnetic field distributions, the contributions of both intra-band and inter-band transitions to plasmonic absorption are revealed. The calculated absorption spectra perfectly reproduce the experimental observations, including the peak positions, shapes, and trends of peak shifting or broadening as a function of nanoparticle sizes. The influences of nanoparticle dimensions and surface ligands on plasmonic absorption of metallic nanoparticles are also systematically explored.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr07115b