Silver particles tailoring of shapes and sizes

Abstract

Dispersions of colloidal silver have been prepared by the reduction of silver nitrate, with different reductants in the presence of various stabilising agents. Aging these dispersions at room temperature for 2 h yielded particles with average sizes ranging from 1 nm up to 6 m and with various shapes like spheres, plates, needles or leafs. Reducing and stabilising agents were found to control the fina particle sizes and shapes. The diversity of morphologies of the silver particles were studied by using electron microscopy. Thermogravimetry, powder X-ray diffraction (XRD) and UV/VIS spectroscopy were carried out for further characterisation.

Photochromism in RbAg4I5 thin films enhanced by hydrogen photosensitization simultaneous to illumination

“…It bleaches out after long-time (during several months) storage at room temperature in oxygencontaining ambience, being stable under the same conditions under vacuum. All these features give the possibility to assign this band to the absorption by metallic colloids of the photolytic silver due to surface plasmons [14][15][16][17][18][19][20][21][22][23].…”

Preparation of Silver Nanoparticles by Using Tripropylene Glycol as the Reducing Agents of Polyol Process

“…9(a), in which the Ag nanoparticles in tetrahedral form can be seen, also confirmed that the Ag nanoparticles prepared in this study were in the FCC structure. Widoniak et al [37] reported that large particles with nonuniform shapes possess an extinction band at about 300 nm and that particles with sizes above 500 nm have no characteristic peaks at the wavelengths greater than 350 nm. As shown in Fig.…”

Solvothermal synthesis of micron-sized spherical particles in TiO2–ZrO2 binary system

“…Recently, metal oxide spheres with homogeneous size and shape are required for many practical applications [14][15][16][17][18][19][20][21][22][23][24][25]. The sol-gel process is known as one of the typical methods for synthesizing metal oxide spheres, and many reports have been made on alkoxide-derived TiO 2 and ZrO 2 spheres.…”

“…Monodispersed TiO 2 colloids of 6-12 nm in diameter have been synthesized using titanium tetraisopropoxide (Ti(OC 3 H 7 i ) 4 ) modified with acetylacetone (acac) as a precursor [22]. Monodispersed, spherical TiO 2 and ZrO 2 particles of 0.1-2 mm in diameter were prepared from alkoxide solutions by addition of salts or block-copolymers [25].…”