Citrate ions and chloride ions involved in the synthesis of anisotropic silver nanostructures
Citrate ions and chloride ions involved in the synthesis of anisotropic silver nanostructures
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柠檬酸根离子和氯离子参与各向异性银纳米结构的合成
DOI：
10.1049/mnl.2014.0185
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发表时间：
2015
影响因子：
1.3
通讯作者：
Man Shi-Qing
中科院分区：
文献类型：
--
作者：
Tang Junqi;Zhao Qianrun;Zhang Ning;Man Shi-Qing
各向异性金属纳米粒子由于其独特的光学、电子和催化性能而引起了研究者的极大兴趣。本文介绍了如何将氯离子和柠檬酸根离子加入到硝酸银（Ag）溶液中以合成各向异性的银纳米结构，特别是在没有高水热或溶剂热操作温度的情况下形成Ag纳米线（AgNW）。AgCl胶体沉淀在初始阶段产生，促进游离银离子的还原，并帮助控制银离子在低浓度下用于AgNW的生长。AgNW的合成也是温度和氢氧根依赖性的，因为柠檬酸根离子可以在不存在氯离子的情况下在适当的温度（超过130°C）下指导AgNW的生长。用透射电子显微镜和紫外-可见吸收光谱对产物进行了表征。实验结果表明，氯离子在各向异性银纳米结构的生长中起着至关重要的作用。
Anisotropic metal nanoparticles are of considerable interest to researchers because of their unique optical, electronic and catalytic properties compared with spherical nanoparticles. This Letter describes how chloride ions and citrate ions can be added to silver (Ag) nitrate solution to synthesise anisotropic silver nanostructures especially to form the Ag nanowires (AgNWs) without high hydrothermal or solvothermal operating temperatures. The AgCl colloidal precipitates were produced in the initial stage promoting the reduction of free silver ions and helping control silver ions at low concentration for the growth of AgNWs. The synthesis of AgNWs was also temperature and hydroxide radical dependent since the citrate ions could direct the growth of AgNWs at proper temperatures (over 130°C) in the absence of chloride ions. Transmission electron microscopy and UV–vis absorption spectra have been used to investigate the obtained products. The experimental results suggested that the chloride ions played a crucial role in directing the growth of anisotropic Ag nanostructures.