The synthesis of Se NPs was carried out by a chemical reduction in aqueous medium in the presence of stabilizers. The synthesis scheme is shown in Figure 1 . Alkyldimethylbenzylammonium chloride (catamine AB) (Vitareactive, Dzerzhinsk, Russia) was used as a stabilizer. Selenious acid was used as a selenium-containing precursor (INTRERHIM, St. Petersburg, Russia), and ascorbic acid was used as a reducing agent (Lenreactive, St. Petersburg, Russia).
The synthesis of Se NPs samples stabilized with alkyldimethylbenzylammonium chloride (catamine AB) was carried out in three stages. In the first stage, solutions were prepared with a different ratio between the amount of quaternary ammonium compounds and the amount of selenious acid. For this purpose, 0.036 M of the selenious acid solution was dissolved in 100 cm3 from 0.68 g to 5.24 g of quaternary ammonium compound, depending on the given ratio. In the second stage, 0.088 M ascorbic acid solution was prepared by dissolving 773.8 mg in 50 cm3 of distilled water. In the third stage, a solution of ascorbic acid was added dropwise to a solution of selenic acid and stabilizer under intensive stirring and the resulting sample was mixed for 5–10 min.
The synthesis of Se NPs samples stabilized with alkyldimethylbenzylammonium chloride (catamine AB) was carried out in three stages. In the first stage, solutions were prepared with a different ratio between the amount of quaternary ammonium compounds and the amount of selenious acid. For this purpose, 0.036 M of the selenious acid solution was dissolved in 100 cm3 from 0.68 g to 5.24 g of quaternary ammonium compound, depending on the given ratio. In the second stage, 0.088 M ascorbic acid solution was prepared by dissolving 773.8 mg in 50 cm3 of distilled water. In the third stage, a solution of ascorbic acid was added dropwise to a solution of selenic acid and stabilizer under intensive stirring and the resulting sample was mixed for 5–10 min.
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