Microwave-assisted rapid synthesis of anisotropic Ag nanoparticles by solid state transformation

Abstract

Anisotropic silver nanoparticles (NPs) have been synthesized rapidly using microwave irradiation by the decomposition of silver oxalate in a glycol medium using polyvinyl pyrolidone (PVP) as the capping agent. The obtained Ag nanoparticles have been characterized by UV-visible spectroscopy, powder x-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) studies. Anisotropic Ag nanoparticles of average size around 30 nm have been observed in the case of microwave irradiation for 75 s whereas spherical particles of a size around 5-6 nm are formed for 60 s of irradiation. The texture coefficient and particle size calculated from XRD patterns of anisotropic nanoparticles reveal the preferential orientation of (111) facets in the Ag sample. Ethylene glycol is found to be a more suitable medium than diethylene glycol. A plausible mechanism has been proposed for the formation of anisotropic Ag nanoparticles from silver oxalate.

Nanosilver: new ageless and versatile biomedical therapeutic scaffold

“…362,363 Furthermore, AgNPs have been widely used in medical devices and consumer products such as surgical instruments, sterilizers, medical catheters, artificial teeth or orthodontics, bone coating, skin donation, creams, lotions, household sprays, home appliances, toys, detergents, toothpastes, soaps, containers for food storage and preservations, and antiseptic paints. [364][365][366][367][368][369][370] Moreover, AgNPs have wide applications in electronics, such as data storage and optical devices, inks, nano-and optoelectronics, and nonlinear and sub-wavelength optics. 368,371,372 Several investigators have demonstrated that AgNPs and silver composites possess the ability to catalyze chemical reactions, for example, oxidation of CO, 373 oxidation of benzene to phenol, 374 photodegradation of gaseous acetaldehyde, 375 and reduction of p-nitrophenol to p-aminophenol.…”

“…[364][365][366][367][368][369][370] Moreover, AgNPs have wide applications in electronics, such as data storage and optical devices, inks, nano-and optoelectronics, and nonlinear and sub-wavelength optics. 368,371,372 Several investigators have demonstrated that AgNPs and silver composites possess the ability to catalyze chemical reactions, for example, oxidation of CO, 373 oxidation of benzene to phenol, 374 photodegradation of gaseous acetaldehyde, 375 and reduction of p-nitrophenol to p-aminophenol. 369 AgNPs have sensing applications in DNA sequencing 376 and also play an important role in water filtration.…”

Silver Nanoparticles

“…The produced nanoparticles were uniform and stable, and were stable at room temperature for 2 months without any visible change . The production of silver nanoparticles in the presence of Pt seeds, polyvinyl pyrrolidine and ethylene glycol was also reported (Navaladian et al 2008). Additionally, starch has been employed as a template and reducing agent for the synthesis of silver nanoparticles with an average size of 12 nm, using a microwave-assisted synthetic method.…”

Green synthesis of silver nanoparticles and silver colloidal solutions

“…Silver nanoparticles have potential applications in various fields such as the environment, biomedicine, catalyst, optics and electronics [1][2][3][4]. Silver nanoparticles have also drawn much attention because they show high bactericidal effects [5][6][7][8][9].…”

“…Silver nanoparticles have also drawn much attention because they show high bactericidal effects [5][6][7][8][9]. Various approaches to synthesis metal nanoparticles have been reported such as chemical reduction, UV photolysis, gamma irradiation, metal vapor deposition, laser ablation, sputtering… Among these, chemical reduction has been the most extensively investigated [1,2]. In this paper, thermal decomposition of silver oxalate complexes to fabricate high purity silver nanoparticles and reduction of silver oxalate complexes by ethylenglycol using polyvinyl pyrolidone as the capping agent has been explored.…”