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首页> 外文期刊>Journal of Colloid and Interface Science >Multifunctional spiky branched gold-silver nanostars with near-infrared and short-wavelength infrared localized surface plasmon resonances
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Multifunctional spiky branched gold-silver nanostars with near-infrared and short-wavelength infrared localized surface plasmon resonances

机译：多功能尖峰分支金银纳米载物，具有近红外和短波红外局部等离子体共振

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摘要

We report a one-pot seedless green method for the synthesis of gold-silver (AuAg) spiky branched nanostars, with gold (90%) being the major component. Here, the zwitterionic surfactant lauryl sulfobetaine (LSB) is employed in the synthesis of bimetallic nanostars. The concentration of LSB plays an important role in determining the shape of nano-objects. A minimum LSB concentration of 50 mM is required for the formation of spiky branched nanostars, the size of which is controlled by increasing the LSB concentration. Two distinct intense localized surface plasmon resonances in the near-infrared (NIR) and short-wavelength infrared ranges are observed. The molecular structure of LSB causes LSB molecules to assemble into spherical micelles that act as a soft template for the growth of the nano-objects. An analysis of the mechanisms behind the formation of the nanostars suggests that there is a rapid growth of spikes followed by the formation of a spherical core at the center. AuAg nanostars with evenly spaced spikes and low branching demonstrate great potential as efficient nanocatalysts, surface-enhanced Raman scattering-active substrates and for photothermal therapy, active in both the visible and NIR regions. (C) 2019 Elsevier Inc. All rights reserved.
机译：我们报告了一种单盆种无籽绿色方法，用于合成金银（AuAg）尖锐的支链纳米条首，金（90％）是主要成分。这里，在合成双金属纳米柱的合成中使用两性离子表面活性剂月桂基磺基（LSB）。 LSB的浓度在确定纳米物体的形状方面起着重要作用。形成尖峰支链的纳米柱需要最小LSB浓度为50mm，其尺寸是通过增加LSB浓度来控制的。观察到近红外（NIR）和短波红外线范围内的两个不同的强烈局部表面等离子体共振。 LSB的分子结构使LSB分子组装成球形胶束，其充当纳米物体生长的软模板。对纳米条首形成后面的机制分析表明，尖峰的快速生长，然后在中心形成球形核心。具有均匀间隔的尖峰和低分支的AuAg纳米柱证明了高效的纳米催化剂，表面增强拉曼散射活性基材和光热疗法，在可见和NIR区域中有效。 （c）2019 Elsevier Inc.保留所有权利。

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