Exploration of the growth process of ultrathin silica shells on the surface of gold nanorods by the localized surface plasmon resonance
Exploration of the growth process of ultrathin silica shells on the surface of gold nanorods by the localized surface plasmon resonance
复制标题
局域表面等离子体共振探索金纳米棒表面超薄二氧化硅壳的生长过程
DOI：
10.1088/0957-4484/25/4/045704
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发表时间：
2014-01-31
期刊：
影响因子：
3.5
通讯作者：
Zhao, Yibing
中科院分区：
文献类型：
--
作者：
Li, Chong;Li, Yujie;Zhao, Yibing
超薄二氧化硅涂层（UTSC）已成为一种有效的方法，以提高纳米粒子的相容性和稳定性，而不会削弱其固有的光学性能。探索纳米粒子表面包覆二氧化硅壳层生长过程的探索策略是一项有价值的创新，将有利于纳米粒子包覆二氧化硅及其相关应用的发展。在这项工作中，我们报告了一个独特的，非常有效的和直接的战略，探测金纳米棒（Au NR），利用局部表面等离子体共振（LSPR）作为报告信号的表面上的二氧化硅壳的生长。Au纳米棒表面的二氧化硅壳层厚度可在0.5-3.5 nm范围内定量测量和预测。结果表明，LSPR位移准确地反映了生长过程中Au NR上的二氧化硅壳层厚度的实时变化。通过使用所开发的策略，我们进一步分析了UTSC的生长在Au NR的表面上，通过进料的Na 2 SiO 3在逐步的方式。LSPR的响应性分析还提供了重要的洞察UTSC的屏蔽效果上的表面上的Au NR，这是不访问与传统的策略。这种基于LSPR的策略允许从一个新的角度探索二氧化硅的表面介导的溶胶-凝胶反应。
Ultrathin silica coating (UTSC) has emerged as an effective way to improve the compatibility and stability of nanoparticles without attenuating their intrinsic optical properties. Exploration strategies to probe the growth process of ultrathin silica shells on the surface of nanoparticles would represent a valuable innovation that would benefit the development of ultrathin silica coated nanoparticles and their relevant applications. In this work, we report a unique, very effective and straightforward strategy for probing the growth of ultrathin silica shells on the surface of gold nanorods (Au NRs), which exploits the localized surface plasmon resonance (LSPR) as a reporting signal. The thickness of the ultrathin silica shells on the surface of Au NRs can be quantitatively measured and predicted in the range of 0.5–3.5 nm. It is demonstrated that the LSPR shift accurately reflects the real-time change in the thickness of the ultrathin silica shells on Au NRs during the growth process. By using the developed strategy, we further analyze the growth of UTSC on the surface of Au NRs via feeding of Na2SiO3 in a stepwise manner. The responsiveness analysis of LSPR also provides important insight into the shielding effect of UTSC on the surface of Au NRs that is not accessible with conventional strategies. This LSPR-based strategy permits exploration of the surface-mediated sol–gel reactions of silica from a new point of view.