The Growth of Phosphonium Gold Nanoparticles in Alkaline Media: Kinetics and Mechanism of the Processстатья
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Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.
Аннотация:It has been found that the addition of ammonia water to a gold sol obtained by the Duff method induces the growth of the gold particles. The growth kinetics of such particles in alkaline solutions of ammonia and sodium hydroxide has been investigated. Using the modified Kolmogorov–Johnson–Mel–Avrami model, the aggregative mechanism of nanoparticle growth has been revealed for a system with the maximum NH3⋅H2O concentration, while a mixed mechanism, which includes the Ostwald ripening, has been found for other systems. It has been shown that the sizes and dispersity of the final particles can be controlled by varying the concentration of ammonia water and the time of preliminary incubation of an initial sol, while sodium hydroxide does not exhibit such ability. It has been assumed that the decomposition of gold–phosphine complexes, which stabilize the ultrafine particles, followed by the formation of gold–ammonia complexes is the most probable explanation for the action of ammonia water on the Duff sols.