Laser-induced changes in silver metal nanoparticles incorporated in viscous media (original) (raw)
Related papers
Fabrication of Silver Nanoparticles by Laser Ablation in Liquid Solution
Silver nanoparticles were synthesized by laser (Nd:YAG, 1064 nm) ablation of a silver target immersed in various concentrations of NaCl solutions as well as in distilled water. The silver nanoparticles were prepared by laser ablation in distilled water at different experimental parameters. The effect of ablation time on size and aggregation of AgNPs prepared in distilled water was studied. The average size of the produced particles is increased as ablation time increased. As the ablation time increases the intensity of plasmon peak increase indicating the AgNPs concentration increases. As the fluence increases the size of nanoparticles decreases until they reached their critical size below which above this value the nanoparticles begin to agglomerate again and the size increased. [Hisham Imam, Khaled A. Elsayed, Lotfi Z. Ismail, Mostafa Afify and M. Ata Khedr. Fabrication of silver nanoparticles by laser ablation in liquid solution. Life Sci J 2013;10(4):401-404]. (ISSN: 1097-8135).
Preparation and Characterization of Silver Nanoparticles (AgNPs) by Pulsed Laser Ablation in Liquid
Macromolecular Symposia
In this study, the technique of pulsed laser ablation in liquid (PLAL) is used to prepare colloidal silver (Ag) nanoparticles in distilled water (D.W.). The optical properties and the synthesis of the nanoparticles are characterized by UV‐visible spectrophotometer, photoluminescence (PL), infrared Fourier transforms (FT‐IR), and transmission electron microscopy (TEM) measurement. The optical characteristics of (Ag) nanoparticles are investigated using (UV–vis) analysis on all colloidal samples, which reveal a large peak at wavelengths of (405–410 nm) for silver nanoparticles created using PLAL technology. The infrared Fourier transforms (FT‐IR) study determines the functional groups of silver nanoparticles in D.W. The silver nanoparticles (AgNPs) have a spherical form, and their diameters range from 12 to 20 nm, according to the transmission electron microscopy (TEM) measurements. The photoluminescence (PL) data reveal two peaks, one in the visible region, which is responsible for t...
Synthesis of Silver Nanoparticles Dispersed in Various Aqueous Media Using Laser Ablation
The particle size, morphology, and stability of Ag-NPs were investigated in the present study. A Q-Switched Nd: YAG pulsed laser (𝜆 = 532 nm, 360mJ/pulse) was used for ablation of a pure Ag plate for 30 min to prepare Ag-NPs in the organic compound such as ethylene glycol (EG) and biopolymer such as chitosan. The media (EG, chitosan) permitted the making of NPs with well dispersed and average size of Ag-NPs in EG is about 22 nm and in chitosan is about 10 nm in spherical form. Particle size, morphology, and stability of NPs were compared with distilled water as a reference. The stability of the samples was studied bymeasuring UV-visible absorption spectra of samples after onemonth.The result indicated that the formation efficiency of NPs in chitosan was higher than other media and NPs in chitosan solution were more stable than other media during one month storage.This method for synthesis of silver NPs could be as a green method due to its environmentally friendly nature.
Study of laser fragmentation process of silver nanoparticles in aqueous media
Applied Physics A, 2008
Laser fragmentation of Ag nanoparticles in Ag hydrosol was studied by simultaneous measurements of the transmitted fluence of the incident laser beam and the time evolution of the surface plasmon extinction (SPE) spectra. The experiments showed that the laser fragmentation in a small volume of hydrosol proceeds during first 20 pulses and then reaches saturation. The value of the transmitted fluence corresponding to saturation increases with incident pulse fluence, but the impact of the first pulse applied to the hydrosols shows an optical limitation. Fluences above 303 mJ/cm 2 cause the formation of less stable, aggregating nanoparticles, while fluences below 90 mJ/cm 2 do not provide sufficient energy for efficient fragmentation. The interval of fluences between 90-303 mJ/cm 2 is optimal for fragmentation, since stable hydrosols constituted by small, nonaggregated nanoparticles are formed.
Frontiers in nanoscience and nanotechnology, 2018
Synthesis of homogeneous spherical silver nanoparticles (Ag NPs) was conducted successfully by photochemical reduction of silver ions (Ag +) (10-4 M) using near ultraviolet (UV) pulsed laser (355 nm) irradiation in an aqueous solution of surfactant sodium dodecyl sulphate (SDS) and cetyltrimethylammonium bromide (CTAB). Higher concentration of SDS and CTAB facilitated dispersion of reduced silver salt. Size of NPs was 72 and 163 nm in SDS and CTAB, respectively. Precursor silver acetate salt was irradiated for 30 min. Effect of surfactant concentration, irradiation time, and hydrophilicity of surfactants were investigated. Amount of Ag + ions reduced increased with surfactant concentration and irradiation time. Note: This article was retracted by the corresponding author from the journal "Advances in Nanoparticles" on an honest error and data still valid note. In this published article the electron generation by biphotonic mechanism has not been claimed as was done in the above retracted article.
The interaction of pulse laser beam with silver target in pure water from 1064nm, Nd:YAG pulsed laser is investigated. Fabrication of silver nanochain suspended in water was accomplished via a laser a Photoinduced melting was studied on the formation of nanostructures under both 42mj/pulse and 92mj/pulse laser irradiation energies. The resonance Plasmon wavelengths are 294nm and 483nm for transverse and longitudinal polarizations of nanochain, respectively. As well as, the resonance Plasmon wavelength of nanoparticles was seen at 407nm. We have characterized the silver products by UV Microscopy micrographs. The ratio of nanochains tHan 92mj/pulse. laser beam with silver target in pure water from 1064nm, Nd:YAG pulsed laser is investigated. Fabrication of silver nanochain suspended in water was accomplished via a laser a induced melting was studied on the formation of nanostructures under both 42mj/pulse and 92mj/pulse laser The resonance Plasmon wavelengths are 294nm and 483nm for t...
Laser Ablated Silver Nanoparticles with Nearly the Same Size in Different Carrier Media
Journal of Nanomaterials, 2010
Poly(vinyl-pyrrolidone) (PVP) stabilized silver nanoparticles with an average particle size ranging from 4.3 to 4.9 nm were synthesized by laser ablation in preformed colloids in methanol, acetone, ethylene glycol, and glycerin. Aqueous colloids obtained using PVP, poly(vinyl-alcohol) (PVA), and sodium citrate as stabilizing agents also lead to a good control over particle size distribution. Silver ions were reduced with sodium borohydride. The smaller average particle size and narrower dispersivity in comparison to previously reported data were ascribed to the relatively small size of the particles formed in the chemical reduction step, laser fluence, and the use of PVP, which was not previously used as the stabilizing agent in “top-down” routes. The surface plasmon resonance band maximum wavelength shifted from 398 nm in methanol to 425 nm in glycerin. This shift must be due to solvent effects since all other variables were the same.
Naonosecond Nd:YAG laser was utilized as a part of the vast majority of tests achieved up today. Aside from the vitality of laser pulse energy, the aftereffects of laser removal in fluid stage rely on upon numerous other test parameters: laser wavelength, time of removal investigation, blending conditions and centering conditions. The Exact impact of a significant number of these components is not clear up today. In the event that most of the takes a shot at laser removal of fluid was performed in immaculate water (the fundamental inspiration for these works is SERS application or in watery arrangements, a few specialists made their trials in various natural solvents. Silver (Ag) nanoparticles (NPs) were synthesized by pulsed (Q-switched, 1064 doubled frequency-Nd: YAG). The laser ablation of silver metal plates has been performed by immersing these metal plates in deionised water DDW and NaCL solvent. The pulsed laser ablation in liquids (PLAL) process preformed with different laser shots such as 15 and 30 pulses and laser pulse energy of(600-900) mJ and liquid depth is 8 mm. The formation efficiency of PLAL process was quantified in term of the absorption spectrum peaks. The absorption spectra Ag shows a sharp and single peak around 412 nm indicates the production of pure and spherical Ag NPs with an average size in the range of (5-20) nm. There is a simultaneous possibility of on-line observation of the nanoparticles formation via measuring the variation in nanoparticles absorption at the peaks observed. Changing the way of the fluid environment is a simple and flexible way to control the size appropriation and strength of silver colloidal nanoparticles.
Properties Studies of Silver Nanoparticles Colloids in Ethanol Prepared by Means Pulses Laser
In this work we study the influence of the laser pulses silver nanoparticles productivity during laser ablation of silver immersed in liquid. Ag nanoparticles were synthesized by pulsed laser ablation of Ag targets in ethanol using the (1064 nm, Q-switched, Nd:YAG) laser with energy of 140 mJ per pulse. UV-Visible absorption spectra were used for the characterization and comparison of products. The non-linear refractive index and absorption coefficient of silver nanoparticles were investigated using a single beam z-scan technique; the excitation source was a continuous wave (CW) of 650 nm diode laser with a beam power of 50 mW. All investigated samples showed negative -induced non-linear refractive indices.