Photochemically grown silver nanodecahedra with precise tuning of plasmonic resonance

Abstract

The ability to control the local surface plasmonic resonance (LSPR) absorption peaks of silver nanoparticles will greatly broaden the scope of their practical application. Conventional methods tune the LSPR peaks by modifying the shape or size of the silver nanoparticles. Here, we present a novel method to tune the LSPR band by controlling the particle corner sharpness. A modified photochemical method was used to prepare silver nanoparticles. It was found that the nanoparticles irradiated using light-emitting diodes (LEDs) with a wavelength of 455 nm were decahedral, although the reaction temperature was different. However, the in-plane dipole LSPR peak of the as-prepared silver nanodecahedra exhibited an evident red shift from 460 nm to 500 nm during the synthesis process, and the wavelength of the LSPR peak increased linearly as the reaction time increased. A numerical simulation conducted to investigate the mechanism behind the shift revealed that the red shift of the LSPR peak was mainly induced by the evolution of the corner sharpness of the silver nanodecahedra. These results demonstrated the effectiveness of the method in precisely tuning the LSPR peak by controlling the reaction time. By turning off the irradiation light, the photochemical process could be immediately terminated, and the LSPR peak of the silver nanoparticles remained constant. Compared with conventional methods, the present tuning precision can reach 1 nm.

Synthesis and Comparative Biological Properties of Ag-PEG Nanoparticles with Tunable Morphologies from Janus to Multi-Core Shell Structure

“…The functionality of SH-PEA makes it possible to utilizing photochemical reduction route for the fabrication of AgNPs with a green and facile method. Photochemical reduction has been proved as a cost-effective, convenient and controllable technique to prepare AgNPs [ 41 , 42 , 43 ]. In this work, Ag-PEG nanoparticles were prepared through photochemical reduction of AgNO 3 with SH-PEA in water.…”

Silver- and copper-modified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst

“…590 nm). 49,[78][79][80] The photoabsorption properties of Cu-modified samples are quite different than reported ones, where generally, due to rapid copper oxidation, no LSPR peak of Cu could be detected (no absorption at 400 to 600 nm), and a single broad peak at 600 to 1000 nm indicated the presence of CuO. 81,82 For a single DAP/Cu sample, the broad peak from 400 to 800 nm could be caused by: (1) the interfacial charge transfer (IFCT) from the valence band of titania to the Cu x O (X∶1; 2) clusters at 400 to 500 nm, (2) the interband absorption of Cu 2 O at 500 to 600 nm, (3) LSPR of zero-valent Cu at ca.…”

Quadrupole Plasmon Lasers with a Super Low Threshold Based on an Active Three-Layer Nanoshell Structure

“…In terms of experimental feasibility, a 5-nm-thick silver shell clearly outperforms a 2-nm-thick silver shell. Although the 5-nm-thick silver layer chosen here is quite thin, it can be manufactured effectively by adopting a specific fabrication technique that can make the shell layer ultra-smooth and continuous [23,24]. Therefore, in the following numerical calculations, we identify 5 nm as the optimal thickness of the silver nanoshell for a plasmonic laser.…”

“…In addition, compared with nanospheres and nanoeggs, dielectric-metal-dielectric core/shell/shell nanoparticles show more flexible tunebility and more colorful plasmonic features [9]. Recently, we demonstrated a novel method to precisely tune the LSPR band of silver nanoparticles by controlling the reaction time of the photochemical synthesis [23]; we also synthesized spherical, decahedral, flaky hexagonal, and flaky triangular silver nanoparticles using the modified photochemical method [24]. Based on the former works, we will further synthesize silver nanoshell-structure NPs to explore the possibility to design and fabricate silver-nanoshell plasmonic lasers.…”