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首页> 外文期刊>Applied Surface Science >Modification of surfaces of silver nanoparticles for controlled deposition of silicon, manganese, and titanium dioxides
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Modification of surfaces of silver nanoparticles for controlled deposition of silicon, manganese, and titanium dioxides

机译：修饰银纳米颗粒表面以控制硅，锰和二氧化钛的沉积

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In this work we show that nanometric-thick layers of SiO2, MnO2, and TiO2 may be effectively deposited on various silver nanoparticles (including cubic Ag nanoparticles) covered by a very thin (below 0.4 nm) layer of silver sulphide. The background in Raman measurements generated by sulphide-protected Ag nanoparticles is significantly smaller than that for analogous Ag nanoparticles protected by a monolayer formed from alkanethiols - depositing alkanethiols on a surface of anisotropic silver nanoparticles is the current standard method used for protecting a surface of Ag nanoparticles before depositing a layer of silica. Because of significantly smaller generated Raman background, Ag@SiO2 nanostructures with an Ag2S linkage layer between the silver core and the silica shell are very promising low-background electromagnetic nanoresonators for carrying out Raman analysis of various surfaces - especially using what is known as shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). Sample SHINERS analyses of various surfaces (including pesticide-contaminated surfaces of tomatoes) using cubic-Ag@SiO2 nanoparticles as electromagnetic nanoresonators are also presented. (C) 2017 Elsevier B.V. All rights reserved.
机译：在这项工作中，我们表明，SiO2，MnO2和TiO2的纳米厚层可以有效地沉积在被非常薄（低于0.4 nm）的硫化银层覆盖的各种银纳米颗粒（包括立方银纳米颗粒）上。由硫化物保护的Ag纳米颗粒产生的拉曼测量背景远远小于由烷硫醇形成的单层保护的类似Ag纳米颗粒的背景-在各向异性银纳米颗粒表面沉积烷硫醇是目前用于保护Ag表面的标准方法在沉积一层二氧化硅之前先形成纳米颗粒。由于产生的拉曼背景要小得多，因此在银核和二氧化硅壳之间具有Ag2S连接层的Ag @ SiO2纳米结构是非常有前途的低本底电磁纳米谐振器，可用于对各种表面进行拉曼分析-特别是使用所谓的壳-分离的纳米粒子增强拉曼光谱（SHINERS）。还介绍了使用立方Ag @ SiO2纳米颗粒作为电磁纳米谐振器对各种表面（包括西红柿污染的表面）进行样品SHINERS分析的方法。 （C）2017 Elsevier B.V.保留所有权利。

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