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Plasma Medicine

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ISSN Druckformat: 1947-5764

ISSN Online: 1947-5772

SJR: 0.216 SNIP: 0.263 CiteScore™:: 1.4 H-Index: 24

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

Volumen 6, Ausgabe 1, 2016, pp. 85-100
DOI: 10.1615/PlasmaMed.2016015839
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ABSTRAKT

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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