Synthesis of Silver Nanoprisms with Variable Size and Investigation of Their Optical Properties: A First-Year Undergraduate Experiment Exploring Plasmonic Nanoparticles
Synthesis of Silver Nanoprisms with Variable Size and Investigation of Their Optical Properties: A First-Year Undergraduate Experiment Exploring Plasmonic Nanoparticles
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DOI：
10.1021/ed100166g
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发表时间：
2010-10-01
影响因子：
3
通讯作者：
Kitaev, Vladimir
中科院分区：
文献类型：
--
作者：
Frank, Andrew J.;Cathcart, Nicole;Kitaev, Vladimir
描述了一个强大的和合理的简单的实验，向学生介绍了纳米级特性的可视化，并打算为一年级的实验室。制备由于其等离子体吸收相对于尺寸的变化而显示不同颜色的银纳米棱镜（NP）。控制的银纳米棱镜的大小是通过使用一种新的方法，其中溴化物被添加到反应作为尺寸确定剂，和银离子被还原的硼氢化物在柠檬酸盐和过氧化物的存在下作为稳定剂和形状导向剂，分别。在典型的实验中，产生具有不同尺寸的银纳米棱镜的四个分散体，其颜色从蓝色（最大）到黄色（最小）。介于两者之间的颜色是紫罗兰色、紫色、红色和橙子。这些彩色银纳米粒子的合成是第一次作为本科实验。一旦合成，纳米棱镜的特点是使用紫外维斯光谱，并可以进行比尔定律实验。此外，氧化还原化学和可见光谱的概念可以在这个实验中得到加强，它可以进一步适用于更先进的技术，专注于纳米粒子性能的研究的高级实验室。
A robust and reasonably simple experiment is described that introduces students to the visualization of nanoscale properties and is intended for a first-year laboratory. Silver nanoprisms (NPs) that display different colors due to variation of their plasmonic absorption with respect to size are prepared. Control over the size of the silver nanoprisms is achieved using a novel approach, where bromide is added to the reaction as a size-determining agent, and silver ions are reduced by borohydride in the presence of citrate and peroxide as stabilizing and shape-directing agents, respectively. In a typical experiment, four dispersions of silver nanoprisms with different sizes are produced that are colored from blue (largest) to yellow (smallest). The colors attainable in between are violet, purple, red, and orange. The synthesis of these colored silver NPs is described for the first time as an undergraduate experiment. Once synthesized, the nanoprisms are characterized using UV−vis spectroscopy, and a Beer’s law experiment can be performed. Furthermore, concepts of redox chemistry and visible spectroscopy can be reinforced in this experiment, and it can be further adapted for upper-level laboratories focused on the investigation of nanoparticle properties by more advanced techniques.