Application of Direct Current Atmospheric Pressure Glow Microdischarge Generated in Contact with a Flowing Liquid Solution for Synthesis of Au-Ag Core-Shell Nanoparticles
| Autor: | Anna Dzimitrowicz, Piotr Jamroz, Marcin Nyk, Pawel Pohl |
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| Rok vydání: | 2016 |
| Předmět: |
78.67.Bf Nanocrystals
nanoparticles and nanoclusters Materials science atmospheric pressure plasmas Analytical chemistry Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Article law.invention Absorbance law silver General Materials Science Surface plasmon resonance core-shell nanoparticles nanoparticles characterization nanoparticles properties gold Atmospheric pressure 021001 nanoscience & nanotechnology Nanoshell Cathode 0104 chemical sciences Transmission electron microscopy 61.46.-w Structure of nanoscale materials Absorption (chemistry) 0210 nano-technology 81.07.-b Nanoscale materials and structures: fabrication and characterization |
| Zdroj: | Materials; Volume 9; Issue 4; Pages: 268 Materials |
| ISSN: | 1996-1944 |
| Popis: | A direct current atmospheric pressure glow microdischarge (dc-μAPGD) generated between an Ar nozzle microjet and a flowing liquid was applied to produce Au-Ag core-shell nanoparticles (Au@AgCSNPs) in a continuous flow system. Firstly, operating dc-μAPGD with the flowing solution of the Au(III) ions as the cathode, the Au nanoparticles (AuNPs) core was produced. Next, to produce the core-shell nanostructures, the collected AuNPs solution was immediately mixed with an AgNO3 solution and passed through the system with the reversed polarity to fabricate the Ag nanoshell on the AuNPs core. The formation of Au@AgCSNPs was confirmed using ultraviolet-visible (UV-Vis) absorbance spectrophotometry, transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS). Three localized surface plasmon resonance absorption bands with wavelengths centered at 372, 546, and 675 nm were observed in the UV-Vis spectrum of Au@AgCSNPs, confirming the reduction of both the Au(III) and Ag(I) ions. The right configuration of metals in Au@AgCSNPs was evidenced by TEM. The Au core diameter was 10.2 ± 2.0 nm, while the thickness of the Ag nanoshell was 5.8 ± 1.8 nm. The elemental composition of the bimetallic nanoparticles was also confirmed by EDS. It is possible to obtain 90 mL of a solution containing Au@AgCSNPs per hour using the applied microdischarge system. |
| Databáze: | OpenAIRE |
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