Photophysical properties of luminescent silicon nanoparticles surface-modified with organic molecules via hydrosilylation

Abstract

Luminescent silicon nanoparticles have attracted considerable attention for their potential uses in various applications. Many approaches have been reported to protect the surface of silicon nanoparticles and prevent their easy oxidation. Various air-stable luminescent silicon nanoparticles have been successfully prepared. However, the effect of interactions of the π-electron system with the silicon surface on the excited state properties of silicon nanoparticles is unclear. In this study, we have successfully prepared silicon nanoparticles protected with three organic compounds (styrene, 1-decene, and 1-vinyl naphthalene) and have examined their photophysical properties. The ligand π-electron systems on the silicon surface promoted the light harvesting ability for the luminescence through a charge transfer transition between the protective molecules and silicon nanoparticles and also enhanced the radiative rate of the silicon nanoparticles.

Use of Mg–Al Nanoclay as an Efficient Vehicle for the Delivery of the Herbicide 2,4-Dichlorophenoxyacetic Acid

“…The increment in the emission intensity for 2,4-D loaded nanoclay likely arose from charge transfer from 2,4-D through to nanoclay. The charge transfer promoted the radiative transition that further enhanced the emission spectra …”

“…The charge transfer promoted the radiative transition that further enhanced the emission spectra. 33 To understand the effect of loading on the structural orientation, 27 Al SSNMR of nanoclay was measured before and after loading. The peak commonly observed for both the nanoclay and 2,4-D loaded nanoclay corresponded with an octahedral Al in brucite pattern that is surrounded by six Mg 2+ ions.…”

Laser Ablation of Silicon Nanoparticles and Their Use in Charge-Coupled Devices for UV Light Sensing via Wavelength-Shifting Properties

“…Silicon nanoparticles exhibit a unique sensitivity to UV light due to a phenomenon known as the "quantum confinement effect" [33,34]. This effect arises when the dimensions of a material are reduced to nanoscale dimensions, typically in the range of a few nanometers or smaller [35]. In bulk silicon, the electronic bandgap-the energy difference between the valence band and the conduction band-determines its optical properties.…”

Highly photoluminescent and stable silicon nanocrystals functionalized via microwave-assisted hydrosilylation

“…There are two the promising methods to produce large quantities of luminescent Si-NCs, namely synthesis in a nonthermal plasma reactor or high temperature disproportionation reaction of silicon oxide based materialssilicon monoxide SiO x or hydrogen silsesquioxanes (HSiO 1.5 ) nand subsequent functionalization of the hydrogen capped nanocrystals (H-Si-NCs) with organic ligands. [3][4][5][6][7][8][9][10][11][12] The functionalization of Si-NCs relies on radical hydrosilylation reactions, initiated by temperature, light or radical initiators. The functionalization is necessary as it signicantly increases the PLQY and chemical stability of the Si-NCs.…”