Simple Synthesis of Monodisperse, Quasi-spherical, Citrate-Stabilized Silver Nanocrystals in Water

Abstract

Monodisperse, quasi-spherical silver nanocrystals (Ag NCs) have been produced directly in water via adding the aqueous solution of a mixture of AgNO3, sodium citrate, and KI into the boiling aqueous solutions of ascorbic acid (AA). The AA is used to significantly accelerate reduction of AgNO3 in order to promote a very fast nucleation, and the KI is used to tailor the growth of the Ag NCs into a quasi-spherical shape via its preferential adsorption on the NC {111} facets. The major role of citrate is to stabilize the newly formed NCs, whereas it has a minor contribution to reduction of AgNO3. The synergy of the effects of AA, citrate, and KI can significantly narrow the size distributions of the Ag NCs obtained so and transform the NC shapes to be truly quasi-spherical.

Gas-phase volatile organic chloride electroreduction: A versatile experimental setup for electrolytic dechlorination and voltammetric analysis

“…In particular the attention is focused on nanosized particles since they exhibit enhanced activity in comparison with bulk silver allowing the use of composite materials with very low metal loading [21,2]. The present contribution reports the preparation, characterization and use of Ag nanoparticles (AgNP) obtained by chemical reduction of AgNO 3 by trisodium citrate dehydrate [23]. The already assessed electrocatalytic activity of AgNP's for the electroreduction of trichloromethane model substrate in aqueous media [2] is now applied in a new electrochemical cell setup adopting a Gas Diffusion Electrode (GDE) as sensor/working cathode for the direct gas-phase electroreduction of CHCl 3 .…”

Усиление люминесценции квантовых точек вблизи слоя наночастиц Ag/SiO-=SUB=-2-=/SUB=-

“…Монодисперсные ядра частиц были получены в результате коллоидного синтеза по методу [12], а для создания оболочек использовался модифицированный метод Штобера [13]. Для получения различной толщины диэлектрической оболочки h s к спиртовому раство-ру частиц серебра добавлялось различное количество источника оксида кремния -тетраэтоксисилана [14], который в результате реакции гидролиза и поликонденсации преобразовывался в диоксид кремния.…”

Tadpole-shaped Au nano-particles fabricated by laser fragmentation of Au nano-spheres in liquid

“…The peculiar properties associated with remarkable electron transport will render them highly desirable in extensive applications, such as superactive photo-catalysts, fast-response biosensors, photodynamic therapy, and ultrasensitive fluorescent probes [1][2][3][4][5][6] . Most importantly, the enhanced localized surface plasmon resonance (LSPR) of Au NMs in visible or near-infrared frequencies has provided the possibilities of using them for photovoltaic performance/optical applications, in vivo anatomical imaging, and early stage tumor diagnosis with deep tissue penetration [1,[7][8][9] .…”

“…To succeed in the manipulation of LSPRs in the visible and near-infrared regions, much interest has been aroused in the fabrication of anisotropic-shaped Au NMs owing to their unique multipolar plasmon resonance modes. It has been recognized that the multipolar plasmon resonance modes supported by anisotropic-shaped Au NMs should be precisely correlated with the desired crystal orientation, crystal structure, and NM sizes and shapes [4,6] . Consequently, tremendous efforts have been especially devoted to the controlled synthesis of anisotropic-shaped Au NMs, such as nano-rods, nanoprisms, nano-cages, nano-bipyramids, nano-rices, and nano-wires.…”