Self-organized formation of silver nanowires, nanocubes and bipyramids via a solvothermal method

Self-organized formation of silver nanowires, nanocubes and bipyramids via a solvothermal method
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通过溶剂热法自组织形成银纳米线、纳米立方体和双锥体

DOI:
10.1016/j.actamat.2008.01.043
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发表时间:
2008-06
期刊:
影响因子:
9.4
通讯作者:
--
中科院分区:
材料科学1区
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--
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以聚乙烯吡咯烷酮为吸附剂,乙二醇还原硝酸银,并加入不同浓度的氯化钠(NaCl),通过简单的溶剂热法合成了纳米线、纳米立方体和双锥三种银纳米结构。当使用低浓度的NaCl溶液时,出现痕量的氯化银(AgCl),并充当种子以促进银纳米线的形成。然而,当使用高浓度的NaCl溶液时,大量的AgCl出现并且主要充当控制剂,导致银纳米立方体和双锥的形成。电子显微镜,X-射线衍射和吸收光谱已被用来调查的产品,并提出了一种机制来解释这些结构的形态控制。我们的工作提供了一种制备不同形状银纳米结构的策略。
Three kinds of silver nanostructures – nanowires, nanocubes and bipyramids – were synthesized via a simple solvothermal method by reducing silver nitrate with ethylene glycol using poly(vinylpyrrolidone) as an adsorption agent and adding different concentrations of sodium chloride (NaCl) into the solution. When a low-concentration NaCl solution is used, trace amounts of silver chloride (AgCl) appear and act as the seeds to facilitate the formation of the silver nanowires. However, when a high-concentration NaCl solution is used, large amounts of AgCl appear and mainly act as the controlling agent leading to the formation of silver nanocubes and bipyramids. Electron microscopy, X-ray diffraction and absorption spectra have been used to investigate the products, and a mechanism is proposed to interpret the morphological control of these structures. Our work provides a strategy to fabricate silver nanostructures with different shapes.
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