Synthesis and Characterization of Tunable Rainbow Colored Colloidal Silver Nanoparticles Using Single-Nanoparticle Plasmonic Microscopy and Spectroscopy.
Synthesis and Characterization of Tunable Rainbow Colored Colloidal Silver Nanoparticles Using Single-Nanoparticle Plasmonic Microscopy and Spectroscopy.
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DOI：
10.1039/c0jm01990a
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发表时间：
2010-01-01
影响因子：
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通讯作者：
Nancy Xu XH
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文献类型：
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作者：
Huang T;Nancy Xu XH
贵金属纳米颗粒（NP）具有尺寸和形状依赖的光学性质，这表明在单个NP分辨率下调谐系综NP的所需光学性质的可能性，并强调了原位和实时探测单个NP的尺寸和形状的重要性。在这项研究中，我们合成了12个银纳米粒子的胶体。每个胶体都含有不同大小和形状的纳米粒子，呈现彩虹色，吸收光谱的峰值波长为393 - 738 nm。我们关联的大小和形状的单纳米颗粒确定的高分辨率透射电子显微镜（HRTEM）与散射局部表面等离子体共振（LSPR）光谱的单纳米颗粒的特点是暗场光学显微镜和光谱（DFOMS）。单个球形（直径2-39 nm）、棒状（长度2-47 nm，纵横比1.3-1.6）和三角形（长度4-84 nm，厚度2-27 nm）NP分别在476±5或533±12、611±23和711±40 nm处显示LSPR光谱（λmax）。值得注意的是，我们观察到了新的饼干形状的纳米粒子，其表现出LSPR光谱（λmax）在725±10 nm处，肩峰在604±5 nm处。任何给定形状的单个纳米颗粒的尺寸与其LSPR光谱（λmax）的线性相关性使得能够创建纳米光学标尺（校准曲线），用于使用DFOMS在真实的时间内识别溶液中单个纳米颗粒的尺寸和形状，提供了使用单个纳米颗粒作为多色光学探针在真实的时间内在nm尺度下研究溶液和活生物体中感兴趣的动力学事件的可行性。
Noble metal nanoparticles (NPs) possess size- and shape- dependent optical properties, suggesting the possibility of tuning desired optical properties of ensemble NPs at single NP resolution and underscoring the importance of probing the sizes and shapes of single NPs in situ and in real-time. In this study, we synthesized twelve colloids of Ag NPs. Each colloid contains various sizes and shapes of single NPs, showing rainbow colors with peak-wavelength of absorption spectra from 393 to 738 nm. We correlated the sizes and shapes of single NPs determined by high-resolution transmission electron microscopy (HRTEM) with scattering localized surface plasmon resonance (LSPR) spectra of single NPs characterized by dark-field optical microcopy and spectroscopy (DFOMS). Single spherical (2–39 nm in diameter), rod (2–47 nm in length with aspect ratios of 1.3–1.6), and triangular (4–84 nm in length with thickness of 2–27 nm) NPs show LSPR spectra (λmax) at 476±5 or 533±12, 611±23, and 711±40 nm, respectively. Notably, we observed new cookie-shaped NPs, which exhibit LSPR spectra (λmax) at 725±10 nm with a shoulder peak at 604±5 nm. Linear correlations of sizes of any given shape of single NPs with their LSPR spectra (λmax) enable the creation of nano optical rulers (calibration curves) for identification of the sizes and shapes of single NPs in solution in real time using DFOMS, offering the feasibility of using single NPs as multicolored optical probes for study of dynamics events of interest in solutions and living organisms at nm scale in real time.