Localized-Surface-Plasmon Enhanced the 357 nm Forward Emission from ZnMgO Films Capped by Pt Nanoparticles

Abstract

The Pt nanoparticles (NPs), which posses the wider tunable localized-surface-plasmon (LSP) energy varying from deep ultraviolet to visible region depending on their morphology, were prepared by annealing Pt thin films with different initial mass-thicknesses. A sixfold enhancement of the 357 nm forward emission of ZnMgO was observed after capping with Pt NPs, which is due to the resonance coupling between the LSP of Pt NPs and the band-gap emission of ZnMgO. The other factors affecting the ultraviolet emission of ZnMgO, such as emission from Pt itself and light multi-scattering at the interface, were also discussed. These results indicate that Pt NPs can be used to enhance the ultraviolet emission through the LSP coupling for various wide band-gap semiconductors.

Synthesis and Properties of Platinum Nanoparticles by Pulsed Laser Ablation in Liquid

“…According to the literature [4,5] and theoretical calculations [23], Pt spherical nanoparticles of around 10 nm presented an optical band in the far UV (<215 nm in water) and was attributed to interband transitions. In our case, the peak appeared at around 330 nm, which is in agreement with the results reported by You et al [24] that presented spectra with size dependence peaks in this range for Pt NPs of 4-8 nm. The absorption spectra were in agreement with that of Pt nanoparticles prepared by PLAL as well as chemical methods.…”

Descontaminación de agua utilizando nanomateriales y procesos fotocatalíticos

“…Oro 552 Eustis y El-Sayed 2006Plata 480 You et al (2009) Cobre 578 Gwak et al (1998) Platino 420 You et al (2009) Níquel 400 Chen et al (2011) fotoactividad del material híbrido con relación a sus componentes individuales; ello ocurrirá siempre y cuando las nanopartículas metálicas presenten propiedades plasmónicas (Cao et al, 2011). Otro ejemplo de estos sistemas son los semiconductores modificados en superficie por la adsorción de moléculas orgánicas con propiedades fotoquímicas, las cuales pueden alcanzar el estado de triplete a una longitud de onda similar a la del semiconductor y favorecer la activación del fotocatalizador mediante la transferencia de electrones desde la molécula excitada hacia la banda de conducción del semiconductor (Chong et al, 2010).…”

Composition Dependence on Structural and Optical Properties of MgxZn1-xO Thin Films Prepared by Sol-Gel Method

“…24,25 It was assumed that the enhancement in the (002) diffraction peak was due to increase in the oxygen affinity between Zn and O caused by the incorporation of MgO. The dynamic affinity of the Zn for bonding with O might be improved by the incorporation with a suitable amount of MgO due to the oxygen affinity of the Mg is larger than that of the Zn.…”