Тип публикации: статья из журнала
Год издания: 2024
Идентификатор DOI: 10.1134/S1061933X23601294
Ключевые слова: silver nanoparticles (NPs), concentrated silver organosols, phase transfer of nanoparticles, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), conductive silver films
Аннотация: Due to their unique properties, organosols of silver nanoparticles are widely used in optical and semiconductor devices, to produce electrically and thermally conductive films, as catalysts, antibacterial materials, etc. This work proposes a simple and highly productive method for the preparation of silver organosols, which have a Показать полностьюmetal concentration as high as 1800 g/L and contain spherical nanoparticles with low polydispersity and a median size of 9.1 nm. The method consists in the initial preparation of silver nanoparticle hydrosols with a concentration of higher than 30 g/L followed by the transfer of the NPs into an organic phase of <i>o</i>-xylene. A set of physical research methods has been employed to study the regularities of the extraction of silver nanoparticles with <i>o</i>-xylene in the presence of cetyltrimethylammonium bromide (CTAB) and ethanol and to determine the optimal process conditions, under which the extraction degree is as high as 62.5%. It has been found that bromine anions contained in CTAB molecules cause the aggregation of some amount of silver nanoparticles with the formation of silver metal sediment in the aqueous phase. According to X-ray photoelectron spectroscopy data, the sediment contains bromide ions (up to 4 at %) on the particle surface. Organosols synthesized under optimal conditions are stable for more than 7 months and withstand repeated cycles of drying and redispersing. Silver organosols have been used to obtain metal films with an electrical conductivity of about 68 500 S/cm, which increases to 412 000 and 509 500 S/cm (87.8% of the electrical conductivity of bulk silver) after thermal treatment at 150 and 250°C, respectively.
Журнал: Colloid Journal
Выпуск журнала: Т.86, №2
Номера страниц: 208-217
ISSN журнала: 1061933X
Место издания: Москва
Издатель: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд)