Fabrication of 2D arrays of multi-component nanoparticles

18th International Summer School on Vacuum, Electron and Ion Technologies

Nikov, Ru G.^1 ; Nedyalkov, N.N.^1 ; Stankova, N.E.^1 ; Atanasov, P.A.^1

Acad. E. Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria^1

关键词: Dielectric substrates;    Incident radiation;    Nanosecond laser pulse;    Narrow size distributions;    Quartz substrate;    Surface enhanced Raman spectroscopy;    Transmission spectrums;    Two dimensional (2D) arrays;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/514/1/012025/pdf
DOI  :  10.1088/1742-6596/514/1/012025

来源: IOP

【 摘 要 】

The paper presents a study of a physical method for fabrication of two-dimensional (2D) arrays composed of multi-component nanoparticles on a dielectric substrate. The method consists of two steps. In the first one, thin films composed of different metals are deposited by a classical PLD technique by using targets consisting of sections of different materials. Thin films composed of mixtures of different metals, as gold, silver, nickel, cobalt, iron, platinum, are thus deposited on a quartz substrate. By changing the area of the different sections in the target, thin films with different concentration of the metals are produced. The films fabricated are then annealed by nanosecond laser pulses delivered by a Nd:YAG laser system operating at its third harmonic. The modification of the films is studied as a function of the parameters of the incident radiation, as number of pulses and laser pulse fluence. It is found that the laser annealing can lead to a decomposition of the film into a monolayer of nanoparticles with a narrow size distribution. The optical properties of the structures produced are analyzed on the basis of their transmission spectra. The structures can be used in surface enhanced Raman spectroscopy (SERS) and magneto-optics.