Synthesis of Monodisperse AgAu Alloy Nanoparticles with Independently Tunable Morphology, Composition, Size, and Surface Chemistry and Their 3‐D Superlattices
Synthesis of Monodisperse AgAu Alloy Nanoparticles with Independently Tunable Morphology, Composition, Size, and Surface Chemistry and Their 3‐D Superlattices
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DOI：
10.1002/adfm.200801476
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发表时间：
2009-05
影响因子：
19
通讯作者：
Qingbo Zhang;Jianping Xie;Jing Liang;J. Lee
中科院分区：
文献类型：
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作者：
Qingbo Zhang;Jianping Xie;Jing Liang;J. Lee
在这里，提出了一种策略，用于合成单分散的银-金Au合金纳米颗粒，从而颗粒属性，如形态，成分，尺寸和表面化学可以独立地控制，变化和定制。该合成使用多步骤程序，以离散和独立的步骤控制形态、尺寸和组成。具体而言，首先通过化学还原Ag离子制备具有相同形貌但不同尺寸的Ag纳米颗粒。然后进行消化成熟后处理，然后进行种子介导的生长，以缩小粒度分布并改变粒度。然后通过与HAuCl 4的置换反应形成单分散的Ag/Au合金纳米颗粒。单晶截顶八面体（TO）Ag/Au合金纳米颗粒和二十面体多重孪晶颗粒都可以通过该过程容易地制备。通过使用截断八面体作为模型形态，合成的纳米粒子具有相同的大小，但不同的组合物，具有相同的组合物，但不同的尺寸的纳米粒子，和具有不同的表面化学的纳米粒子进行了详细的演示和讨论。由于形状和尺寸的单分散性，所有合成的Ag-Au合金纳米颗粒在溶剂缓慢蒸发时容易在固体基底上形成超晶格。纳米颗粒的堆积模式强烈依赖于纳米颗粒的天然形态。
Here, a strategy for synthesizing monodisperse AgAu alloy nanoparticles whereby particle attributes such as morphology, composition, size, and surface chemistry may be independently controlled, varied, and customized is presented. The synthesis uses a multi‐step procedure to deliver control of morphology, size, and composition in discrete and independent steps. Specifically Ag nanoparticles with the same morphology but different sizes are first prepared by the chemical reduction of Ag ions. A digestive ripening post‐treatment followed by seed‐mediated growth is then applied to narrow the size distribution and to vary the particle size. Monodisperse AgAu alloy nanoparticles are then formed by a replacement reaction with HAuCl4. Both single‐crystalline truncated octahedral (TO) AgAu alloy nanoparticles and icosahedral multiply twinned particles can be easily prepared by this procedure. By using truncated octahedrons as the model morphology, the syntheses of nanoparticles with the same size but different compositions, of nanoparticles with the same composition but variable sizes, and of nanoparticles with different surface chemistry are demonstrated and discussed in detail. Because of the shape and size monodispersity, all of the as‐synthesized AgAu alloy nanoparticles easily form superlattices on a solid substrate upon slow evaporation of the solvent. The packing pattern of the nanoparticles is strongly dependent on the native morphology of the nanoparticles.