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首页> 外文期刊>RSC Advances >Synthesis of optically tunable bumpy silver nanoshells by changing the silica core size and their SERS activities
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Synthesis of optically tunable bumpy silver nanoshells by changing the silica core size and their SERS activities

机译：通过改变二氧化硅芯尺寸及其SERS活动来合成光学调谐凸型银纳米型

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摘要

The fabrication of hollow metal nanostructures on a silica core template has been widely studied by taking advantage of the chemical stabilities of silica cores. When the size of the silica core reduces, however, this benefit is no longer effective because there are the synthetic difficulties which often cause dispersion instability, and therefore finally the aggregations of nanoparticles (NPs) are often caused during introduction of metallic nanostructures. This study reports the successful fabrication of silver nanoshells (AgNSs; 119, 152, 165, 186, and 207 nm) on amorphous silica nanoparticles (Si NPs) of different core sizes (59, 82, 103, 124, and 148 nm) by overcoming the increased instabilities during fabrication with reduced core sizes. Improvements related to fabrication were made by changing the reducing agents, controlling the amount of the dispersing agent and the concentration of Si NPs. All the AgNSs showed broad extinction from the visible to the near-infrared (NIR) region regardless of particle sizes, and their size-dependent surface properties were analyzed by introducing a concept of roughness factor, with AgNS of 152 nm exhibiting the highest degree of roughness. High SERS enhancements of AgNSs of all sizes were observed at three laser excitation wavelengths (532, 660, and 785 nm), and these enhancements correlated positively with the surface roughness. Therefore, our results provide a clear understanding of size-dependent SERS activity for AgNS, facilitating proper selection of AgNS with an appropriate size depending on the purpose of the investigation.
机译：通过利用二氧化硅芯的化学稳定性，广泛研究了二氧化硅核心模板上的中空金属纳米结构。然而，当二氧化硅核心的尺寸减小时，这种益处不再有效，因为存在合成困难，这通常会导致分散不稳定性，因此最后在引入金属纳米结构期间纳米颗粒（NPS）的聚集。本研究报告了在不同核心尺寸（59,82,103,124和148nm）的无定形二氧化硅纳米粒子（Si NP）上的银纳米型（AgNSS; 119,152,165,186和207nm）的成功制造克服了在减少核心尺寸的制造过程中增加的不稳定性。通过改变还原剂，控制分散剂的量和Si NP的浓度来制备与制造相关的改进。所有AGNS都显示出近红外（NIR）区域的可见偏光，无论粒度如何，通过引入粗糙因子的概念来分析它们的大小依赖性表面性质，具有152nm的AGN呈现最高程度粗糙度。在三个激光激发波长（532,660和785nm）中观察到所有尺寸的AGNS的高分辨率增强，并且这些增强功能与表面粗糙度正相关。 Therefore, our results provide a clear understanding of size-dependent SERS activity for AgNS, facilitating proper selection of AgNS with an appropriate size depending on the purpose of the investigation.

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  • 来源
    《RSC Advances》 |2017年第64期|共7页
  • 作者

    Chang Hyejin; Ko Eunbyeol; Kang Homan; Cha Myeong Geun; Lee Yoon-Sik; Jeong Dae Hong;

  • 作者单位

    Seoul Natl Univ Dept Chem Educ Seoul 08826 South Korea;

    Seoul Natl Univ Dept Chem Educ Seoul 08826 South Korea;

    Seoul Natl Univ Interdisciplinary Program Nanosci &

    Technol Seoul 08826 South Korea;

    Seoul Natl Univ Dept Chem Educ Seoul 08826 South Korea;

    Seoul Natl Univ Interdisciplinary Program Nanosci &

    Technol Seoul 08826 South Korea;

    Seoul Natl Univ Dept Chem Educ Seoul 08826 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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