Silver nanoplates with special shapes: Controlled synthesis and their surface plasmon resonance and surface-enhanced Raman scattering properties
Silver nanoplates with special shapes: Controlled synthesis and their surface plasmon resonance and surface-enhanced Raman scattering properties
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DOI：
10.1021/cm0615875
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发表时间：
2006-10-03
影响因子：
8.6
通讯作者：
Ozaki, Yukihiro
中科院分区：
文献类型：
--
作者：
Lu, Lehui;Kobayashi, Atsuko;Ozaki, Yukihiro
金属纳米结构的形状控制合成为设计未来纳米器件的理想构建块开辟了许多新的可能性。在这项工作中，具有复杂形状的新型单分散银纳米片，即盘状形状和花状形状，通过在银晶种的存在下在室温下用抗坏血酸还原[Ag（NH3）（2）]（+）以高产率可控地合成。与以前在十六烷基三甲基溴化铵（CTAB）胶束存在下合成银纳米片的方法不同，使用前体[Ag（NH3）（2）]（+）而不是Ag+，提供了以温和方式控制还原反应进程的灵活策略。这些银纳米片具有圆盘和花的形状被证明具有表面等离子体共振（SPR），这与它们的几何形状直接相关。由于其形状的高各向异性，花状银纳米片相对于球形银纳米颗粒和盘状银纳米片表现出优异的表面增强拉曼散射（Sers）增强能力。我们相信，这种新型花状银纳米片的高效合成和优异的Sers增强能力，将在生物传感和标记系统中找到潜在的应用。
Shape-controlled synthesis of metal nanostructures has opened many new possibilities to design ideal building blocks for future nanodevices. In this work, new types of monodisperse silver nanoplates with complex shapes, namely, a disklike shape and flowerlike shapes, were controllably synthesized in high yield by reducing [Ag(NH3)(2)](+) with ascorbic acid in the presence of silver seed at room temperature. Unlike previous methods for synthesizing the silver nanoplates in the presence of cetyltrimethylammonium bromide (CTAB) micelles, the use of the precursor [Ag(NH3)(2)](+), other than Ag+, provides a flexible strategy to control the procession of the reduction reaction in a mild way. These silver nanoplates with shapes of disk and flower were shown to possess surface plasmon resonance (SPR) that directly relates to their geometric shapes. As a result of their high anisotropy in shape, the flowerlike silver nanoplates exhibit excellent surface-enhanced Raman scattering (SERS) enhancement ability relative to spherical silver nanoparticles and the disklike silver nanoplates. We believe that with the efficient synthesis and excellent SERS enhancement ability, these novel flowerlike silver nanoplates may find potential applications for biological sensing and labeling systems.