Enhanced Magneto‐optical Properties of Semiconductor EuS Nanocrystals Assisted by Surface Plasmon Resonance of Gold Nanoparticles

Abstract

Remarkable magneto-optical properties of a new isolator material, that is, europium sulfide nanocrystals with gold (EuS-Au nanosystem), has been demonstrated for a future photo-information technology. Attachment of gold particles that exhibit surface plasmon resonance leads to amplification of the magneto-optical properties of the EuS nanocrystals. To construct the EuS-Au nanosystems, cubic EuS and spherical Au nanocrystals have been joined by a variety of organic linkers, that is, 1,2-ethanedithiol (EDT), 1,6-hexanedithiol (HDT), 1,10-decanedithiol (DDT), 1,4-bisethanethionaphthalene (NpEDT), or 1,4-bisdecanethionaphthalene (NpDDT) . Formation of these systems was observed by XRD, TEM, and absorption spectra measurements. The magneto-optical properties of the EuS-Au nanosystem have been characterized by using Faraday rotation spectroscopy. The Faraday rotation angle of the EuS-Au nanosystem is dependent on the Au particle size and interparticle distance between EuS and Au nanocrystals. Enhancement of the Faraday rotation of EuS-Au nanosystems was observed. The spin configuration in the excited state of the EuS-Au nanosystem was also investigated using photo-assisted electron paramagnetic resonance.

Luminescent silicon nanoparticles covered with ionic liquid

“…The luminescence properties of silicon nanoparticles come from the direct recombination of excited electrons and positive holes based on the wavefunction overlap in the nanometer range, which is known as the quantum confinement effect. The energy gaps of silicon nanoparticles depend on their particle sizes, indirect quantum effects of silicon nanoparticles [30].…”

“…The silicon nanoparticles with ionic liquid exhibit perfect Si-H bonds on the surface without stable chemical bonds [30]. …”

“…Their silicon surface protections are based on the chemical reaction for formation of stable chemical bond between silicon atom and organic molecules, surface termination reaction [23]. The stable chemical bonds on the silicon nanoparticles, however, prevent from surface-exchange reaction for assemble formation and addition of photo-functional groups such as a photosensitizer [30][31][32]. The surface-exchange reaction is a key factor for development of photo-3 functional materials.…”

Synthesis of TbO<i>_x</i>Nanoparticles from the Thermal Decomposition of Tb(III) Complexes

“…Singh and coworkers have also reported synthesis of Pd 17 Se 15 nanoparticles using Pd-Se complex and their efficient catalyst for C-O coupling reactions [11]. Recently, we have reported the synthesis of monodisperse EuS nanoparticles using Eu(III) dithiocarbamate complex, and demonstrated characteristic magneto-optical properties of EuS nanoparticles depending on their particle size, shape and surface environments [12][13][14].…”

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

“…253 The distance between the EuS EuS / SiO 2 glass composite Figure 33. Schematic illustration of the preparation of EuSsilica nanoglass via two-step reaction with ligandexchange process:…”