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Seedless, copper-induced synthesis of stable Ag/Cu bimetallic nanoparticles and their optical properties

机译:无籽,铜诱导的稳定Ag / Cu双金属纳米粒子的合成及其光学性质

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摘要

In this study, we demonstrate a sensitive and selective method for the seedless synthesis of an Ag@Cu bimetallic nano-structured material based on the competitive coordination chemistry of cysteine with Cu2+ and Ag+. The subsequent addition of Ag+ to the cysteine-Cu2+, leads to the formation of a perfectly transparent orange-yellow color at 425 nm in the UV-visible region after ca. 3 h of mixing time. These changes are ascribed to the formation of Ag@Cu bimetallic nanoparticles. Visual observations and transmission electron microscope data indicate that the reaction mixture containing different orders of reactants (cysteine + Ag+, cysteine + Cu2+, Ag+ + Cu2+ + cysteine, and cysteine + Cu2+ + Ag+) have different colors as well as different morphologies. The reaction proceeds through the reduction of Ag+ ions into Ag-0 by the side chain HS-moiety of the cysteine-Cu2+ complex. The resulting cystine-Cu2+ complex is subsequently adsorbed onto the surface of Ag-0. The reduction of Cu2+ occurred on the surface of the Ag-0 by under potential deposition. On the basis of this, the formation of Ag@Cu bimetallic nanoparticles can be visualized with the naked eye through the colorless-to-orangeyellow color change. Cysteine could not reduce the Cu2+ ions into metallic copper under normal conditions because Cu2+ has a strong affinity towards coordination through the thiol moiety.
机译:在该研究中,我们证明了基于用Cu2 +和Ag +的半胱氨酸的竞争协调化学品的无籽合成AG @ Cu双金属纳米结构材料的敏感和选择性方法。随后加入到半胱氨酸-Cu 2 +上,导致在CA之后在UV可见区域中形成在425nm处的完全透明的橙黄色。 3小时混合时间。这些变化归因于Ag @ Cu Bimetallic纳米粒子的形成。视觉观察和透射电子显微镜数据表明,含有不同反应物(半胱氨酸+ Ag +,半胱氨酸+ Cu2 +,Ag + + Cu2 + +半胱氨酸和半胱氨酸+ Cu2 + + +)的反应混合物具有不同的颜色以及不同的形态。通过半胱氨酸-Cu 2 +复合物的侧链HS-部分通过将Ag +离子的脂肪+离子的减少进入Ag-0。随后将得到的胱氨酸-Cu 2 +复合物吸附到Ag-0的表面上。通过在电势沉积下,通过沉积的Ag-0表面上发生Cu2 +的还原。在此基础上,Ag @ Cu双金属纳米颗粒的形成可以通过肉眼通过无色对橙色的颜色变化来观察。在正常条件下,半胱氨酸不能将Cu 2 +离子降低到金属铜中,因为Cu2 +对通过硫醇部分的强烈的亲和力。

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  • 来源
    《RSC Advances》 |2016年第35期|共11页
  • 作者单位

    King Abdulaziz Univ Fac Sci Dept Chem POB 80203 Jeddah 80203 Saudi Arabia;

    King Abdulaziz Univ Fac Sci Dept Chem POB 80203 Jeddah 80203 Saudi Arabia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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