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首页> 外文期刊>Materials science and engineering >Colloidal dispersion of gold nanorods: Historical background, optical properties, seed-mediated synthesis, shape separation and self-assembly
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Colloidal dispersion of gold nanorods: Historical background, optical properties, seed-mediated synthesis, shape separation and self-assembly

机译：金纳米棒的胶体分散：历史背景，光学性质，种子介导的合成，形状分离和自组装

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摘要

The color of colloidal dispersions of gold particles in a fluid, typically water, varies from red to blue, depending upon the shape and size of particles. The color and optical properties of gold nanoparticles originate from localized surface plasmons, and are sensitive to their local dielectric environment. Unlike nanospheres, the optical properties, hydrodynamic behavior as well as phase behavior of nanorods are influenced by their shape anisotropy. Thus, rods have an additional absorption peak, possess very different dynamics (affects sedimentation) and their concentrated dispersions form liquid crystalline phases. In this review, we focus on presenting the essential shape dependent optics, as well as the hydrodynamics and phase behavior of rod-like gold nanoparticles. We reveal our methodology for making less polydisperse nanorods sols by using an optimized seed-mediated synthesis (controlled chemistry), followed by shape separation by centrifugation (based on our hydrodynamics arguments). We elucidate the role of Brownian motion in determining colloidal stability and sedimentation behavior, and describe patterns formed by drying mediated assembly on glass slides and TEM grids. We outline early studies (before 1930) of gold sols that are not only instructive in learning about synthesis and physical properties of gold nanoparticles, but show how the study of colloidal gold established many key principles in colloidal science.
机译：金颗粒在流体（通常是水）中的胶态分散体的颜色，从红色到蓝色，取决于颗粒的形状和大小。金纳米粒子的颜色和光学性质源自局部表面等离子体激元，并且对其局部介电环境敏感。与纳米球不同，纳米棒的光学特性，流体动力学行为和相行为受其形状各向异性的影响。因此，棒具有附加的吸收峰，具有非常不同的动力学（影响沉降），并且其浓缩的分散体形成液晶相。在这篇综述中，我们重点介绍棒状金纳米粒子的基本形状依赖光学，以及流体动力学和相行为。我们揭示了通过使用优化的种子介导的合成（受控化学方法），然后通过离心分离形状（基于我们的流体力学论据）来制造较少多分散纳米棒溶胶的方法。我们阐明布朗运动在确定胶体稳定性和沉积行为中的作用，并描述通过在载玻片和TEM网格上干燥介导的组装而形成的图案。我们概述了金溶胶的早期研究（1930年前），这些研究不仅对了解金纳米粒子的合成和物理性质具有指导意义，而且还显示了对胶体金的研究如何建立胶体科学中的许多关键原理。

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  • 来源
    《Materials science and engineering》 |2009年第3期|1-38|共38页
  • 作者

    Vivek Sharma; Kyoungweon Park; Mohan Srinivasarao;

  • 作者单位

    School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States of America Hatsopoulos Microfluids Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Bldg 3-249, Cambridge. MA 02139, United States;

    School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States of America Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH 45433-7702, United States;

    School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States of America School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, United States of America Center for Advanced Research on Optical Microscopy (CAROM), Georgia Institute of Technology, Atlanta, GA 30332, United States of America School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States of America;

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  • 正文语种 eng
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  • 关键词

    gold nanorods; plasmon resonance; self Assembly; nanocomposites; seed-mediated synthesis; evaporative drying;

    机译：金纳米棒;等离子体共振自组装;纳米复合材料种子介导的合成;蒸发干燥;

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