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首页> 外文期刊>Crystal growth & design >Rapid preparation of silver nanorods and nanowires by a microwave-polyol method in the presence of Pt catalyst and polyvinylpyrrolidone
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Rapid preparation of silver nanorods and nanowires by a microwave-polyol method in the presence of Pt catalyst and polyvinylpyrrolidone

机译：在Pt催化剂和聚乙烯吡咯烷酮存在下，通过微波多元醇法快速制备银纳米棒和纳米线

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摘要

Silver nanorods and nanowires have been synthesized by using a microwave (MW)-polyol method. When AgNO3 was reduced by ethylene glycol (EG) in the presence of Pt seeds and a long chain length of poly(vinylpyrrolidone) (PVP: Mw = 360 k), mixtures of one-dimensional (1-D) silver nanorods and nanowires and three-dimensional (3-D) spherical, triangular-bipyramidal, and cubic nanoparticles were synthesized within a few minutes. The average diameters, lengths, and yields of these products were measured as a function of concentration of Pt, PVP, or AgNO3, heating time, or MW power to determine optimum conditions for the synthesis of 1-D products. 1-D products could be easily separated from other 3-D nanoparticles by repeating centrifugal separation in water. Longer and thicker 1-D products could be prepared by using 1-D products as seeds and repeating the reduction of AgNO3 in EG under MW irradiation. In this two-step preparation, some bent 1-D wires due to the combination of {111} facets of two rods and wires were produced. Possible growth mechanisms of 1-D products involving bent structures, and 3-D spherical, triangular-bipyramidal, and cubic nanoparticles were discussed by reference to growth mechanisms of Au core-Ag shell nanocrystals prepared using the two-step MW polyol method.
机译：银纳米棒和纳米线已经通过使用微波（MW）-多元醇方法合成。当在Pt种子和长链长度的聚乙烯吡咯烷酮（PVP：Mw = 360 k）存在下用乙二醇（EG）还原AgNO3时，一维（1-D）银纳米棒和纳米线的混合物几分钟内即可合成三维（3-D）球形，三角形-双锥体和立方纳米粒子。根据Pt，PVP或AgNO3的浓度，加热时间或MW功率测量这些产物的平均直径，长度和产率，以确定合成一维产物的最佳条件。通过在水中重复离心分离，可以轻松地将1-D产物与其他3-D纳米颗粒分离。通过将一维产物用作种子，并在MW照射下重复EG中AgNO3的还原，可以制备更长，更厚的一维产物。在此两步准备中，由于两个杆和线的{111}面的组合，产生了一些弯曲的一维线。通过使用两步MW多元醇方法制备的Au核-Ag壳纳米晶体的生长机理，讨论了涉及弯曲结构的1-D产物以及3-D球形，三角形-双锥体和立方纳米颗粒的可能生长机理。

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