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Ag-Cu Bimetallic Nanoparticle Synthesis and Properties

机译：Ag-Cu双金属纳米粒子的合成与性能

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摘要

Silver(Ag)-Copper(Cu) bimetallic nanoparticles (NPs) were synthesized by chemical reduction with the assistance of a microwave reactor. Considering the difference in redox potential of Ag(I) and Cu(II), the effect of heating method was compared using 'one-pot' and 'twopot' synthesis of Ag-Cu shell-core and Ag-Cu core-shell nanoparticles. One-pot synthesis naturally results in Ag-Cu core-shell nanoparticles since silver has the higher redox potential than copper. In the two-pot synthesis of Ag-Cu core-shell nanoparticles, the effect of the heating conditions was compared. At the highest reaction temperature (175 °C), the galvanic reaction by which silver reduction occurred through the oxidation copper metal, was suppressed and higher Cu/Ag phase ratios could be achieved.;Nanoparticles properties were examined in the following areas: (i) nanoparticle solubility and antibacterial effects, (ii) sintering behavior and electrical conductivity of nanoparticle films. Enhanced antibacterial effects were observed for mixtures of Ag and Cu nanoparticles against planktonic M.smegmatis silver resistant mutants as well as the wild type when compared to the antibacterial effects of pure Ag or Cu NPs alone. However, solubility tests in deionized water, showed that very low Ag ion concentrations resulted when copper was present either in bimetallic nanoparticles or in mixtures of Ag and Cu NPs. This was attributed to a galvanic effect that suppressed the oxidation of silver.;The deposition of nanoparticles on surfaces was studied in terms of the ability of the deposited nanoparticles to inhibit the growth the biofilm. Printed silver nanoparticle dots deposited on microfilters exhibited significant antibacterial effect in inhibiting the growth of biofilm over the whole micro filter surface. Increasing the areal coverage of the dots or their size decreased the number and the size of bacterial colonies. Finally, the sintering behavior of Ag-Cu shell core nanoparticles proved superior to that of Cu nanoparticles and to mixture of silver and copper nanoparticles. This resulted in higher electrical conductivity in the nanoparticle films sintered at lower temperature. This is thought to be due to the higher fraction of Ag-Ag particle contacts.
机译：银（Ag）-铜（Cu）双金属纳米颗粒（NPs）通过在微波反应器的辅助下化学还原而合成。考虑到Ag（I）和Cu（II）的氧化还原电位的差异，使用“一锅法”和“双锅法”合成了Ag-Cu壳核和Ag-Cu核壳纳米粒子，比较了加热方法的效果。一锅法合成自然会生成Ag-Cu核壳纳米粒子，因为银比铜具有更高的氧化还原电位。在Ag-Cu核壳纳米粒子的两锅法合成中，比较了加热条件的影响。在最高反应温度（175°C）下，通过氧化铜金属发生银还原的电流反应得到抑制，可以实现更高的Cu / Ag相比。;在以下区域检查了纳米粒子的性能： ）纳米粒子的溶解度和抗菌作用，（ii）纳米粒子薄膜的烧结行为和电导率。与纯银或铜纳米颗粒单独的抗菌作用相比，观察到银和铜纳米颗粒混合物对浮游细菌耻垢分枝杆菌抗银突变体以及野生型具有增强的抗菌作用。然而，在去离子水中的溶解度测试表明，当铜存在于双金属纳米粒子或银和铜纳米粒子的混合物中时，产生的银离子浓度非常低。这归因于抑制银氧化的电流效应。根据沉积的纳米颗粒抑制生物膜生长的能力研究了纳米颗粒在表面上的沉积。沉积在微滤器上的印刷银纳米颗粒点在抑制整个微滤器表面上生物膜的生长方面表现出显着的抗菌作用。增加点的面积覆盖范围或其大小会减少细菌菌落的数量和大小。最后，事实证明，Ag-Cu壳核纳米粒子的烧结行为优于Cu纳米粒子以及银和铜纳米粒子的混合物。这导致在较低温度下烧结的纳米颗粒膜中的较高电导率。认为这是由于Ag-Ag颗粒接触的比例较高。

著录项

  • 作者

    Xiong, Ziye.;

  • 作者单位

    University of Pittsburgh.;

  • 授予单位 University of Pittsburgh.;
  • 学科 Nanotechnology.;Chemical engineering.;Materials science.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 172 p.
  • 总页数 172
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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