Ag nano-material having ultraviolet band with hybrid quadrupole and preparation method thereof

Abstract

The invention provides an Ag nano-material having an ultraviolet band with a hybrid quadrupole and a preparation method thereof, belonging to the technical field of metal surface plasma materials. The method comprises the steps of preparing an Ag nano-particle film on a sapphire substrate by utilizing a metal sputtering device by controlling sputtering current and sputtering time, and then performing annealing treatment on the obtained Ag nano-particle film at the temperature of 250-450 DEG C in an inert atmosphere to obtain the Ag nano-material having the ultraviolet band with the hybrid quadrupole. The results of a plurality of tests of photoluminescence of MgZnO and MgZnO / Ag samples show that the Ag nano-material can enable near-band edge luminescence of MgZnO to be selectively enhanced, thereby indicating that the hybrid quadrupole can realize a coupling effect with near-band edge excitons of a wide bandgap semiconductor, so that the Ag nano-material can be used for enhancing the interaction between ultraviolet band light and substances.

Description

technical field [0001] The invention belongs to the technical field of metal surface plasmon materials, in particular to an Ag nano material with hybrid quadrupoles in the ultraviolet band and a preparation method thereof. Background technique [0002] Metal surface plasmons have spatial localization and local field enhancement. When surface plasmon resonance occurs, the field enhancement factor near the metal nanostructure can reach 10 2 -10 4 times, this field enhancement effect can be applied in many fields such as biosensing, nano-optoelectronic devices and so on. However, the current research results show that the application of metal surface plasmons is mainly concentrated in the visible and infrared bands, and there are few ultraviolet bands. The main reason is that the dipoles of most metals are located in the visible and infrared bands, and energy matching is the primary condition for the enhancement of the plasmon local field on the metal surface. Although it is...

AI Technical Summary

Problems solved by technology

Although it is theoretically possible to blue-shift the dipole peak of metal nanomaterials by reducing the particle size, it is currently difficult to realize its application in the ultraviolet band by reducing the size experimentally.

First of all, it is difficult to reduce the particle size to make the dipole resonance blue-shift to the ultraviolet band in the material preparation process, and secondly, reducing the size of metal nanoparticles will increase the absorption loss of the metal, which is not conducive to the application

In recent years, researchers have discovered that high-order resonances such as quadrupoles can be excited at short wavelengths, and both theory and experiments have confirmed that the hybrid quadrupoles formed by the Fano interference of dipoles and quadrupoles can also make the local electromagnetic field active. However, the preparation process reported internationally usually requires complex and precise processes such as electron beam or ion beam etching (Ye, J.; Wen, F.; Sobhani, H.; Lassiter, J.B.; Dorpe, P.V. ; Nordlander, P.; Halas, N.J. Plasmonic Nanoclusters: Near Field Properties of the Fano Resonance Interrogated with SERS. Nano Lett. 2012, 12, 1660-1667.)

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