An integrated experimental and theoretical study on the optical properties of uniform hairy noble metal nanoparticles. Issue 48 (22nd October 2018)

• Record Type: Journal Article
• Authors: Yang, Di; Chen, Yihuang; Peng, Hongshang; Chen, Gengxiang; Lin, Zhiqun
• Is Part Of: Nanoscale. Volume 10:Issue 48(2018)
• Page Start: 22750
• Page End: 22757
• Publication Date: 2018-10-22
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr07115b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : An integrated experimental and modeling study reveals the contributions of intra- and inter-band transitions and the size and surface ligand effects on plasmonic absorption. Abstract : 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.