Photoluminescence of Hybrid Structure Base in ZnO@SiO2 Core-Shell Nanoparticles inside Porous Silicon
In this work, core-shell ZnO@SiO2 nanoparticles (NPs) were infiltrated into a macro/meso-porous silicon (PS) structure, to study its luminescent properties. The core-shell ZnO@SiO2 NPs were obtained by colloidal synthesis. The core-shell ZnO@SiO2 NP was 5 nm in diameter. The macro/meso-PS structure was made in two steps: we obtained the macroporous silicon (macro-PS) layer fist and the mesoporous silicon (meso-PS) layer second. This process was conducted using different electrolyte solutions, and the change of electrolyte led to a decrease in the special charge region over the wall macro-PS layer; this allowed the building of the meso-PS layers on the walls and the bottom of the macro-PS layer. The SEM results show the cross-section of the macro/meso-PS structure with and without core-shell ZnO@SiO2 NPs. These SEM images show that the core-shell ZnO@SiO2 NPs that infiltrated into macro/meso-PS structure were more efficiently bonded over all the porous walls. The core-shell ZnO@SiO2 PL interacted with the macro/meso-PS structure, modifying its PL intensity and controlling a shift toward a lower wavelength.
Luz Stella Gomez-Villalba
X. Leon et al., "Photoluminescence of Hybrid Structure Base in ZnO@SiO2 Core-Shell Nanoparticles inside Porous Silicon", Solid State Phenomena, Vol. 286, pp. 40-48, 2019