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Plasma Medicine
SJR: 0.198 SNIP: 0.183 CiteScore™: 0.57

ISSN Print: 1947-5764
ISSN Online: 1947-5772

Plasma Medicine

DOI: 10.1615/PlasmaMed.2016015839
pages 85-100

He/H2 Pulsed-Discharge Plasma as a Tool for Synthesis of Surfactant-Free Colloidal Silver Nanoparticles in Water

Aleksei Treshchalov
Institute of Physics, University of Tartu, Tartu, Estonia
Sergey Tsarenko
Institute of Physics, University of Tartu, Tartu, Estonia
Tea Avarmaa
Institute of Physics, University of Tartu, Tartu, Estonia
Rando Saar
Institute of Physics, University of Tartu, Tartu, Estonia
Ants Lohmus
Institute of Physics, University of Tartu, Tartu, Estonia
Alexander Vanetsev
Institute of Physics, University of Tartu, Tartu, Estonia
Ilmo Sildos
Institute of Physics, University of Tartu, Tartu, Estonia

ABSTRACT

In this study we investigated the interaction of atmospheric-pressure helium (He) and He/H2 pulsed-discharge plasma with different water solutions. We developed a synthetic path to obtain fairly uniform, small (~2 nm), surfactant-free silver (Ag) nanoparticles (NPs) with the treatment of an AgNO3 solution with He/H2 bipolar pulsed discharge. The colloidal solutions containing Ag NPs are stable for months and do not show any agglomeration (the measured zeta potential is 41 mV at pH ~8). The adsorption of negatively charged hydroxide (OH) ions on the surface of Ag NPs could be responsible for the electrostatic stabilization. The treatment of the air-saturated water by pure He plasma with a negative polarity leads to the creation of HNO3 and hydrogen peroxide (H2O2) as stable species. Contrary to the acidification of the solution by He plasma treatment, He/H2 discharge with negative and, in particular, with bipolar pulses produces only traces of HNO3 and no H2O2. We demonstrate here that He/H2 discharge with bipolar pulses is remarkably efficient in near-complete nitrate decomposition and slight alkalization of dilute HN03 and KNO3 solutions.


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