Plasma-assisted synthesis of gold-silver core-shell nanoparticles and their enhanced catalytic dye degradation and surface enhanced Raman spectroscopy performance
Siddiqa Ismail, W. Ahmed, Muhammad Farooq, N. U. Rehman
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引用次数: 0
Abstract
The plasma-liquid interaction (PLI) technique has been employed as a green approach for the synthesis of gold-silver core-shell nanoparticles (Au@AgNPs) using a two-step method. In the first step, the Au seed particles were grown by the PLI technique. Subsequently, the formation of Ag shell was achieved by adding AgNO3 to the solution containing Au seeds and placing it under the atmospheric pressure plasma. The growth of Ag shell on Au seeds was optimized and secondary nucleation was avoided by tuning the discharge current, precursor concentration, and stabilizer (d-fructose) concentration. The shell thickness of Ag was also changed by changing the concentration of AgNO3 in the solution. UV-Vis spectroscopy, scanning electron microscopy, and energy-dispersive x-ray spectroscopy were used to analyze the synthesized nanoparticles. Furthermore, the particles were employed for catalysis and surface enhanced Raman spectroscopy (SERS)-based molecular trace detection. The catalytic efficiency of the NPs was investigated for the reduction of four molecules, i.e., 4-nitrophenol, methyl orange, Congo red, and rhodamine B. The SERS-based trace detection was studied for rhodamine 6G using the substrates of synthesized NPs. In both cases, core-shell nanoparticles showed far superior performance compared to the seed Au nanoparticles.
等离子体-液体相互作用(PLI)技术作为一种绿色方法,采用两步法合成了金银核壳纳米粒子(Au@AgNPs)。第一步,利用 PLI 技术生长金种子颗粒。随后,在含有金种子的溶液中加入 AgNO3,并将其置于常压等离子体下,从而形成银壳。通过调整放电电流、前驱体浓度和稳定剂(d-果糖)浓度,优化了金种子上银壳的生长并避免了二次成核。此外,还通过改变溶液中 AgNO3 的浓度来改变银壳的厚度。紫外可见光谱、扫描电子显微镜和能量色散 X 射线光谱被用来分析合成的纳米粒子。此外,这些颗粒还被用于催化和基于表面增强拉曼光谱(SERS)的分子痕量检测。研究了纳米粒子对 4-硝基苯酚、甲基橙、刚果红和罗丹明 B 四种分子还原的催化效率。在这两种情况下,核壳纳米粒子的性能都远远优于种子金纳米粒子。