Synthesis of silver nanocrystals by a modified polyol method

Abstract

A modification of the polyol method has been shown to result in improved efficiency and enhanced kinetics for the synthesis of silver nanocrystals when compared with the traditional polyol method. The Ag nanocrystals produced were characterized using Xray diffraction and transmission electron microscopy. Accordingly, the exhibited Ag crystal structure, corresponding lattice constants, and resultant particle sizes were determined by these means. In addition, using Fourier transform infrared spectroscopy, it was found that a solid-state reaction between the AgNO 3 and the Poly (vinylpyrrolidone) (PVP) takes place prior to their dissolution in ethylene glycol. Moreover, when crystals grow under total rest conditions, they do not develop a spherical morphology as in the traditional polyol method, but a well-defined geometric shape showing preferential crystallographic growth directions. Under the experimental conditions of this work, the exhibited nanocrystal shapes were quasi-planar hexagonal. Apparently, PVP interacts with the FCC crystal structure promoting growth on the {100} preferential direction by playing the role of an atomic arranger.

DMAc used as a reducer for preparation of spherical silver nanoparticles with high dispersion

“…The absorption peak at 1289 cm −1 corresponds to the C-N bond vibration. In addition, the absorption peak at 649 cm −1 indicates the existence of the swing to the face of the C-H bond vibration peak [15,20].…”

“…The plasmon resonance absorption of AgNP occurs in a specific wavelength [15]. The emergence of characteristic absorption peaks in the spectra can represent the performance of a specific color rendering solution.…”

“…Complex in the preparation process of AgNP is produced between PVP and silver atoms. A protective layer of PVP on the surface of AgNP plays a role in controlling the particle size, in which the PVP steric effect limits the reunion among the particles [15].…”

Effect of Polyvinylpyrrolidone on the Formation AgBr Grains in Gelatine Media

“…17 It is proposed that polar groups, such as the CO groups of PVP chain, can interact with metal ions and form coordinating complex. 18 It is suggested that electron clouds are strongly partial to oxygen in polar carbonyl group (CO) and nitrogen atom transfers its electrons to pyrrolidone ring of PVP. Correspondingly, chemical reaction can take place between PVP and metal ions, in which metal ions receive lone pair electrons from the ligands −N and CO group in pyrrolidone ring and form atomic metal that further grows into particles.…”

Ag nanoparticle-filled polymer shell formed around Au nanoparticle core via ultrasound-assisted spherulite growth

“…It is broadly used in areas such as medicine, food, cosmetics, and health-related domains [39]. In a recent work [40][41][42][43][44][45], it was found that poly(vinylpyrrolidone) plays an important role in determining the final shape of nanocrystals. Thanks to the efforts of several research groups, the polymerdirect process has become an effective method in controlling the growth of metals nanostructure.…”