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In this study we investigated the interaction of atmospheric-pressure helium (He) and He/ H 2 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 AgNO 3 solution with He/H 2 bipolar pulsed discharge. The colloidal solutions containing Ag NPs are stable for months 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 HNO 3 and hydrogen peroxide (H 2 O 2 solution by He plasma treatment, He/H 2 discharge with negative and, in particular, with bipolar pulses produces only traces of HNO 3 and no H 2 O 2. We demonstrate here that He/H 2 discharge with bipolar pulses 3 and KNO 3 solutions.

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