Silver Nanoparticles from Ultrasonic Spray Pyrolysis of Aqueous Silver Nitrate (original) (raw)
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Materials Letters, 2011
Silver nanoparticles have been successfully synthesized by the sonochemical route using sodium borohydride and sodium citrate as the reducing agents. The effect of the reducing agents on the particle size and morphology has been studied by carrying out the two reactions at the same ultrasound frequency (20 KHz). The strong reducing agent (NaBH 4 ) produced spherical silver nanoparticles of sizes 10 nm whereas sodium citrate led to much smaller silver nanoparticles of~3 nm diameter. Powder X-ray diffraction studies reveal a high degree of crystallinity and monophasic silver particles. UV-Visible studies show the presence of a surface plasmon band at 405 nm. However the reflectance spectra give a broad band between 340 and 360 nm which is characteristic for the quasi-spherical silver nanoparticles. The specific surface area was found to be 2.6 and 13.1 m 2 /g and the pore radius was found to be 15.2 and 12.3 Å for silver nanoparticles obtained by the sodium borohydride and sodium citrate reduction respectively.
Journal of Physics: Conference Series, 2009
Silver nanoparticles with spheres, rods have been prepared by a pulse sonoelectrochemical technique from an aqueous solution of AgNO 3 in the presence of sodium dodecyl sulfate C 12 H 25 NaO 4 S -(SDS). The as-prepared silver nanoparticles are characterized by electron microscopy (TEM, SEM), powder X-ray diffraction (XRD), and UV-vis absorption spectrum. It was found that the concentration of AgNO 3 and SDS affects the shape of the nanoparticles. The crystal size could be varied from 5 nm up to 200 nm by controlling the various electrodeposition and sonic parameters.
Solid silver particle production by spray pyrolysis
Journal of Aerosol Science, 1993
Solid, spherical, micron-sized silver metal particles were produced by spray pyrolysis from a silver nitrate solution. The effects of reaction temperature, carder gas type, solution concentration, and aerosol droplet size on the characteristics of the resultant silver particles were examined. Pure, dense, unagglomerated particles were produced with an ultrasonic generator at and above 600 ° C using Nz carder gas, and at and above 900°C using air as the carrier gas. Solid particle formation at temperatures below the melting point of silver (962°C) was attributed to sufficiently long residence times (3.5-54 s) which allowed aerosol-phase densification of the porous silver particles resulting from reaction of the precursor.
Sonochemical synthesis of silver nanorods by reduction of silver nitrate in aqueous solution
Ultrasonics sonochemistry, 2010
The sonochemical synthesis of silver nanorods has been achieved by ultrasonic irradiation of the aqueous solution of silver nitrate, methenamine (HMTA) and poly (vinyl pyrrolidone) (PVP) for 60 min. The silver nanorods obtained have lengths of 4-7 microm and mean diameters of about 100 nm. The structures of the samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), selected area electron diffraction (SAED) and X-ray powder diffraction (XRD), and the chemical composition of the sample was examined by energy-dispersive X-ray spectrum (EDS). The effects of the irradiation time, the concentration of PVP and the reaction temperature on the morphology of silver nanorods were discussed, and the mechanism of the silver nanorods formation was tentatively inferred.
Ultrasonic spray pyrolysis for nanoparticles synthesis
Journal of Materials Science, 2000
This article presents new findings regarding the effects of precursor drop size and precursor concentration on product particle size and morphology in ultrasonic spray pyrolysis. Large precursor drops (diameter > 30 µm) generated by ultrasonic atomization at 120 kHz yielded particles with holes due to high solvent evaporation rate, as predicted by the conventional one particle per drop mechanism. Precursor drops 6-9 µm in diameter, generated by an ultrasonic nebulizer at 1.65 MHz and 23.5 W electric drive power, yielded uniform spherical particles 90 nm in diameter with proper control of precursor concentration and residence time. Moreover, air-assisted ultrasonic spray pyrolysis at 120 kHz and 2.3 W yielded spherical particles about 70% of which were smaller than those produced by the ultrasonic spray pyrolysis of the 6-9 µm precursor drops, despite much larger precursor drop size (28 µm peak diameter versus 7 µm mean diameter). These particles are much smaller than predicted by the conventional one particle per drop mechanism, suggesting that a gas-to-particle conversion mechanism may also be involved in spray pyrolysis. C 2004 Kluwer Academic Publishers 0022-2461 C 2004 Kluwer Academic Publishers
A rapid synthesis of silver nanoparticle foam by ultrasonication
Journal of Porous Materials, 2020
Herein, a very simple and rapid synthesis of silver foam is presented. The foam consists of large agglomerates of nanoparticles. Well-defined silver nanostructures are obtained by ultrasonic irradiation to the aqueous solution of the reactants. The formation of particles is so quick that a short pulse of ultrasonic waves for only 10 s is sufficient to convert the aqueous silver nitrate solution into silver particles foam. Here, silicon is used as a catalyst for the reaction without which there was no formation of above foam. An interesting mechanism is followed by the completion of the reaction, where a self assembly of the as formed particles takes place and results in the formation of a foam of well connected particles. The present method of synthesis of self assembled silver foam is simple, innovative, fast, and is quite effective for bulk formation.
Digest Journal of Nanomaterials and Biostructures, 2016
Silver nanoparticles (Ag-NPs) have been successfully synthesized using ultrasound irradiation in the sodium alginate media. AgNO3 and ultrasound irradiation have been used as silver precursor and physical reducing agent to accelerate the synthesis of Ag-NPs. The presence of Ag-NPs can be detected from the changing color of the suspensions. The silver ion reduction was confirmed through the surface plasmon resonance absorption at around 446 nm. The spherical shape and an average diameter of 24. 59 nm were observed by using Transmission Electron Microscopy. The XRD pattern was assigned that the sodium alginate/Ag-NPs is crystalline in nature with fcc planes. The FT-IR spectra shows that the Ag-NPs do not appear many different with sodium alginate due to van der Waal forces. Therefore, this Ag-NPs using sodium alginate can be an alternative in the metal nanoparticles synthesis due to green and speedy method. Moreover, these nanoparticles can apply in many applications such as anti-micr...
Ultrasonics Sonochemistry, 2016
This paper aims to study fabrication and characterization of silver/titanium oxide composite nanoparticle through sonochemical process in the presence of ethylene glycol with alkaline solution. By using ultrasonic irradiation of a mixture of silver nitrate, the dispersed TiO 2 nanoparticle in ethylene glycol associated with aqueous solution of sodium oxide yields Ag/TiO 2 composite nanoparticle with shell/core-type geometry. The powder X-ray diffraction (XRD) of the Ag/TiO 2 composites showed additional diffraction peaks corresponding to the face-centered cubic (fcc) structure of silver crystallization phase, apart from the signals from the cores of TiO 2. Transmission electron microscopy (TEM) images of Ag/TiO 2 composites, which average particle size is roughly 80 nm, reveal that the titanium oxide coated by Ag nanoparticle with a grain size of about 2-5 nm. Additionally, the formation of silver nanoparticles on TiO 2 was monitored by ultraviolet visible light spectrophotometer (UV-Vis). As measured the optical absorption spectra of as-synthesized Ag nanoparticle varying with time, the mechanism of surface formatting silver shell on the cores of TiO 2 could be explored by autocatalytic reaction; the conversion of Ag particle from silver ion is 98% for the reaction time of 1000 s; and the activity energy of synthesizing Ag nanoparticles on TiO 2 is 40 kJ/mol at temperature ranging from 5 to 25°C. Hopefully, this preliminary investigation could be used for mass production of composite nanoparticles assisted by ultrasonic chemistry in the future.
The synthesis and characterization of nanostructured silver films deposited on corning glass by a deposition technique called Pneumatically-Assisted Ultrasonic Spray Pyrolysis are reported. Silver nitrate and triethanolamine were used as silver precursor and reducer agent, respectively. The substrate temperatures during deposition were in the range of 300-450 • C and the deposition times from 30 to 240 s. The deposited films are polycrystalline with cubic face-centered structure, and crystalline grain size less than 30 nm. Deposition rates up to 600Å min −1 were obtained at substrate temperature as low as 300 • C. The electrical, optical, and morphological properties of these films are also reported. Semi-transparent conductive silver films were obtained at 350 • C with a deposition time of 45 s.
Green synthesis of colloidal silver nanoparticles by sonochemical method
2012
A facile sonochemical method was developed for preparing colloidal silver nanoparticles (Ag-NPs) in aqueous gelatin solutions. The effect of the reducing agent and Ag+ concentrations, ultrasonic time, and ultrasonic amplitude on the particle size has been investigated. The size of the Ag-NPs decreases with the ultrasonic amplitude and increases with ultrasonic time. Well-dispersed spherical Ag-NPs with a mean particle size of about 3.5 nm have been synthesized under ultrasonic process.