Tuning Localized Surface Plasmon Resonance Wavelengths of Silver Nanoparticles by Mechanical Deformation.
Tuning Localized Surface Plasmon Resonance Wavelengths of Silver Nanoparticles by Mechanical Deformation.
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DOI：
10.1021/acs.jpcc.6b02169
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发表时间：
2016-09-22
期刊：
影响因子：
--
通讯作者：
Anker JN
中科院分区：
文献类型：
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作者：
Ameer FS;Varahagiri S;Benza DW;Willett DR;Wen Y;Wang F;Chumanov G;Anker JN
我们描述了一种简单的技术，通过在银纳米粒子 (AgNP) 上滚动玻璃管以机械压缩它们来改变银纳米粒子 (AgNP) 的形状。由此产生的形状变化反过来会引起局域表面等离子共振（LSPR）散射光谱的红移并暴露出新的表面积。通过光学和电子显微镜、单纳米颗粒散射光谱和表面增强拉曼光谱（SERS）对扁平颗粒进行了表征。 AFM 和 SEM 图像显示 AgNP 变形为圆盘；将施加的载荷从 0 增加到 100 N 会增加 AgNP 的直径并降低高度。这种变形导致纳米颗粒散射光谱发生显着的红移，并且还产生了硫醇化分子可以附着的新表面积，从 SERS 测量中可以明显看出。这里采用的简单技术不需要光刻模板，并且具有快速、可重复、廉价且可扩展地调整纳米颗粒形状、表面积和共振的潜力，同时保留颗粒体积。
We describe a simple technique to alter the shape of silver nanoparticles (AgNPs) by rolling a glass tube over them to mechanically compress them. The resulting shape change in turn induces a red-shift in the localized surface plasmon resonance (LSPR) scattering spectrum and exposes new surface area. The flattened particles were characterized by optical and electron microscopy, single nanoparticle scattering spectroscopy, and surface enhanced Raman spectroscopy (SERS). AFM and SEM images show that the AgNPs deform into discs; increasing the applied load from 0 to 100 N increases the AgNP diameter and decreases the height. This deformation caused a dramatic red shift in the nanoparticle scattering spectrum and also generated new surface area to which thiolated molecules could attach as evident from SERS measurements. The simple technique employed here requires no lithographic templates and has potential for rapid, reproducible, inexpensive and scalable tuning of nanoparticle shape, surface area, and resonance while preserving particle volume.