Formation of bimetallic gold-silver nanoparticles in glass by UV laser irradiation
Formation of bimetallic gold-silver nanoparticles in glass by UV laser irradiation
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DOI：
10.1016/j.jallcom.2018.07.183
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发表时间：
2018-10-30
影响因子：
6.2
通讯作者：
Bugaev, Lusegen A.
中科院分区：
文献类型：
--
作者：
Heinz, Maximilian;Srabionyan, Vasiliy V.;Bugaev, Lusegen A.
本文介绍了在玻璃近表面区域制备空间排列的金银纳米粒子阵列的实验技术，并对所制备的纳米粒子进行了结构表征。与单晶Au、Ag粒子或相应的薄膜相比，这种纳米粒子阵列具有更宽的表面等离子共振（SPR）特性。所建议的技术是基于紫外激光照射（λ = 193 nm）的玻璃表面初步掺杂银离子，然后溅射涂敷薄的金层。制备的AuAg/玻璃样品的消光光谱表明SPR对施加的激光脉冲数的强烈依赖性。利用透射电子显微镜（TEM）、能量色散X射线能谱（EDX）、X射线荧光（XRF）和X射线吸收精细结构（XAFS）研究了“SPR特性-粒子结构和组成-合成条件”的关系。后者提供了金银键的结构信息，直接证明了金银/玻璃样品中双金属金银纳米颗粒的形成。XAFS导出的Au-Au和Au-Ag键的结构参数的值允许可视化的金和银的分布在代表性的AuAg纳米颗粒的体积，并建议最合理的簇模型的架构，这样的颗粒制备的AuAg/玻璃样品。结果表明，在低脉冲数下制备的AuAg/glass样品中，Au@Ag颗粒的核壳结构（Au-核，Ag-壳）是最合理的，而在50个或更多脉冲数下制备的样品中，无序固溶体结构适合AuAg颗粒。计算的贡献到实验的光学消光光谱的AuAg/玻璃样品的颗粒与所揭示的组成，尺寸和架构进行证明，所提出的纳米粒子的结构模型是不矛盾的观察到的样品的光学性质。(C)2018爱思唯尔B. V.保留所有权利。
Experimental technique for preparing of space arranged arrays of bimetallic AuAg nanoparticles in the near-surface region of glass, exhibiting surface plasmon resonance (SPR) characteristics varying in the wider ranges comparing to monometallic Au, Ag particles or corresponding thin films, is presented together with the structural characterization of the obtained particles. The suggested technique is based on the UV laser irradiation (lambda = 193 nm) of the glass surface preliminary doped with silver ions and then sputter coated by a thin gold layer. Optical extinction spectra of the prepared AuAg/glass samples demonstrated strong dependence of SPR upon the number of laser pulses applied. The relationship "SPR characteristics - particles structure and composition - synthesis conditions" was studied using transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray fluorescence (XRF) method and X-ray absorption fine structure (XAFS) spectroscopy. The latter provided the structural information on Au-Ag bonds, which directly evidenced on the formation of bimetallic AuAg nanoparticles in AuAg/glass samples. The XAFS derived values of structural parameters of Au-Au and Au-Ag bonds allowed to visualize the distribution of gold and silver over the volume of representative AuAg nanoparticle and to suggest the most plausible cluster models of the architecture of such particle for the prepared AuAg/glass samples. It was revealed that the core-shell architecture of Au@Ag particles (Au-core, Ag-shell) is the most plausible in AuAg/glass samples prepared by the low number of laser pulses, while the structure of disordered solid solution is suitable for AuAg particles in samples prepared by similar to 50 and more pulses. Calculations of contributions into experimental optical extinction spectra of AuAg/glass samples from particles with the revealed composition, size and architecture were performed to prove that the proposed structural models of nanoparticles are not in contradiction with the observed optical properties of the samples. (C) 2018 Elsevier B.V. All rights reserved.