Laser annealing of bimetal thin films : A route of fabrication of composite nanostructures
Laser annealing of bimetal thin films : A route of fabrication of composite nanostructures
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双金属薄膜激光退火：复合纳米结构的制造途径
DOI：
10.1016/j.apsusc.2011.12.023
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and M. Obara
中科院分区：
文献类型：
--
作者：
N.N. Nedyalkov;R. Nikov;A.Og. Dikovska;P.A. Atanasov;G. Obara;and M. Obara
该论文介绍了双金属薄膜激光纳米结构的结果。通过使用由不同金属组成的两部分组成的靶材，通过经典的同轴脉冲激光沉积技术来沉积薄膜。使用这种技术，金/镍或金/银薄膜沉积在石英基板上。通过改变靶材不同部分的面积，可以获得两种金属不同浓度的薄膜。然后，所制造的薄膜通过 Nd:YAG 激光系统在 λ=355nm 下运行所发出的纳秒激光脉冲进行退火。研究了所生产薄膜的改性与入射辐射参数（如脉冲数和激光注量）、薄膜成分和环境特征的函数关系。研究发现，激光退火可以导致薄膜的纳米结构，因为在某些条件下薄膜分解成具有窄尺寸分布的单层纳米颗粒。进行的 EDX 分析表明，制造的颗粒由所用基本金属的双金属系统组成。所获得的结构的消光光谱显示出等离激元激发，因为通过改变薄膜中基本金属的比例可以在很宽的范围内有效地调谐共振波长。所获得的结构可用于SERS和磁光领域。
The paper presents results on laser nanostructuring of bimetallic thin films. The thin films are deposited by classical on-axis pulsed laser deposition technology by using targets consisted of two sections composed of different metals. Using this technique gold/nickel or gold/silver thin films are deposited on quartz substrate. By changing the area of the different sections of the target, thin films with different concentrations of the two metals are obtained. The as fabricated films are then annealed by nanosecond laser pulses delivered by Nd:YAG laser system operated at λ=355nm. The modification of the produced films is studied as a function of the parameters of the incident irradiation as pulse number and laser fluence, the composition of the thin films, and characteristics of the environment. It is found that the laser annealing may lead to nanostructuring of the films as at certain conditions the thin films are decomposed into a monolayer of nanoparticles with narrow size distribution. The performed EDX analyses indicated that the fabricated particles are composed by a bimetallic system of the basic metals used. The extinction spectra of the obtained structures show plasmon excitations as the resonance wavelength can be efficiently tuned in a wide range by changing the ratio of the basic metals in the films. The obtained structures can be used in SERS and magneto-optics.