Structural and spectroscopic studies of thin film of silver nanoparticles (original) (raw)
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International Journal of Current Research and Academic Review, 2017
Article Info This work reports the synthesized plasmonic silver nanoparticles (Ag-NPs)by SILAR (successive ionic layer adsorption and reaction)technique on glass substrates with 5, 8, 11, 14 and 17 SILAR cycles and effect on the optical properties of the thin films (TFs). The absorbance data of the as-synthesized Ag-NPs thin films were obtained using UV-Vis (Ultraviolet visible) spectroscopy at room temperature in the wavelength range of 250nmto 900nm. The transmittance, absorption coefficient, optical bandgap, refractive index and extinction coefficient were experimentally measured. The absorption peaks of(450, 455, 470, 455, 500) nm, and optical energy band gaps of (2.20, 2.16, 2.12, 2.11, 1.84) eV with absorption coefficient approximately 10-12 cm-1 were identified for the SILAR cycles, which agree to a particular characteristics of the silver nanoparticles surface plasmon resonance band. The results showed a red shift from 450nm to 500nm by increasing the SILAR cycles from 5 to 17 cycles, which is attributed to coalescence of Ag nanoparticles at higher SILAR deposition cycles. An increase in the refractive index of the films from 1.55 to 2.51 observed, with approximate average value of 1.92, may be due to the optical properties of silver nanoparticles. This study revealed that Ag-NPs synthesized by SILAR technique gives good optical properties with excellent absorption bands in the visible region, which has potential applications in technology.
Spectral Study of Silver Nanoparticles Prepared by Chemical Method
Silver nanoparticles were prepared by the reduction of silver salt (silver nitrate AgNO3) solution using three different methods. The main differences between these methods is by belong to the reducing agent. It is found that the prepared silver nanoparticle was pure and stable for long time. UV-VIS spectrometry indicated formation of spherical silver nano particles. The surface plasmon resonance peaks in absorption spectra for silver colloidal solution showed that the absorption maximum range was at 380- 420 nm. The structures are confirmed by X-ray diffraction (XRD) and the crystallite size was determined from X-ray line broadening using the Scherrer's equation and it was about 32 nm.AFM measurements show that silver nano particles have the average diameter of 69.39 nm and 81.91 nm.
Structural Investigation and Optical Properties of Silver Nanoparticles Synthesis by Chemical Method
Journal of Nano- and Electronic Physics, 2020
We reported here the synthesis, structural characterization and optical properties of silver nanoparticles (Ag NPs). Chemical synthesis method was used to synthesize the Ag NPs. Ethylene was used as capping and reducing reagent. As prepared Ag NPs sample was characterized by X-ray diffraction, X-ray absorption spectroscopy (XAS), scanning electron microscope (SEM) and fourier transform infrared spectroscopy (FTIR). Rietveld refinement of diffraction data revealed the dimensions of unit cell, hkl values, and Fm-3m space group of Ag NPs. The average crystallite size was found to be ~ 38.5 nm. Both X-ray absorption near edge structure (XANES) and Extended X-ray absorption fine structure (EXAFS) techniques at silver K-edge at BL-9 beam line at Indus-2 synchrotron radiation source (2.5 GeV, 125 mA), RRCAT, Indore (M. P.), India. A computer software package IFEFFIT was used to analyze physical parameters. FTIR revealed chemical bonding and symmetry of molecules.
Silver nanoparticles: New synthesis, characterization and photophysical properties
Materials Chemistry and Physics, 2007
In this paper, we report a new solution phase synthetic route to prepare silver(0) nanoparticles and their optical properties. The Ag(0) nanoparticles were prepared by reduction of AgNO 3 using t-BuONa-activated NaH in tetrahydrofuran at low temperature. The resulting t-BuONa-stabilized silver nanoparticles were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and UV-vis spectroscopy. The cubic face centered Ag(0) particles produced present a tight size distribution with an average radius of 3.3 ± 0.7 nm. The silver nanoparticles dispersed in tetrahydrofuran exhibit a broad and structured fluorescence band when exposed to oxygen. This result is corrolated with a red shift of the surface plasmon absorption band. This process has been attributed to production of charged nanoclusters, Ag m 2+ , produced by consecutive oxidation then chemisorption of Ag + onto metal surface.
Synthesis and characterization of silver nanoparticles
2007
Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them ideal candidates for molecular labeling, where phenomena such as surface enhance Raman scattering (SERS) can be exploited. In addition, silver nanoparticles have recently been shown to be a promising antimicrobial material. In the present research silver colloid was produced by sodium citrate reduction. The colloidal silver was incorporated by dip-coating to the polymer substrate. X-Ray Fluorescence Spectroscopy (XRF), Atomic force microscopy (AFM), ultraviolet-visible spectroscopy (UV-VIS ) and SERS indicate that the produced structures include metallic crystalline silver nanoparticles. The surface plasmon resonance peak in absorption spectra of silver particles showed an absorption maximum at 420-500 nm. The silver - polymer nanocomposites structures with selective light properties as a result of plasmon resonance shifting in the UV-VIS wavelength region were produced.
Developing and Characterization of Silver Nanoparticles Synthesized by Electroless Metal Deposition
In this work silicon nanowires (SiNWs) are intended to be grown on Si wafer surface following a bottom-up approach by depositing Ag nanoparticles over P-type Si substrate and then etched. It is a simple electroless metal deposition and wet etching process. Different samples are prepared varying the amount of Ag deposition over the Si substrate surface and changing the parameters of etching. Presence of nanoparticles of Ag are evident from the top view SEM (Scanning electron microscope) images of different samples. Also EDX (Energy-dispersive X-ray spectroscopy) is carried out for the samples and we found the amount of Ag and Si in percentage on different point over the surface of the samples. According to the study of UV (Ultra Violet) spectrophotometer, our synthesized structures show higher absorption than the bulk Si in the wavelength range of 400 nm to 1000 nm. We changed deposition time of Ag, etching time and concentration of HF solution for preparing different samples. We tried to explain the changes in UV absorption data of different samples for varying these parameters. This observation supports that our synthesized structure might be a potential candidate for efficient photovoltaic solar cell and other optoelectronic devices. Keywords: Silicon Nanowires (SiNWs), Electroless Metal Deposition and Etching (EMDE), Photovoltaic (PV), Optical absorption
Optical Materials, 2010
A two-step procedure for the formation of silver nanoparticles embedded in a glass matrix is studied. The procedure consists of: i) the inclusion of silver ions in the glass matrix by electric field assisted dissolution of Ag film deposited on the glass and ii) the aggregation of silver by thermal annealing. The optical properties of the sample, dominated by the surface plasmon resonance of metal nanoparticles in the visible spectral range, are studied by optical spectroscopy. The structural characterization is carried out by grazing-incidence small-angle X-ray scattering measurements performed at the Synchrotron Elettra (Italy) and silver depth profiles are determined using Rutherford backscattering. The results suggest that the depth profile of Ag might be tailored by modification of the parameters of metal film dissolution (electric field and temperature). Variation of thermal annealing parameters (temperature and time) allows control of the nanoparticles size. Thus, the surface plasmon absorption intensity and line shape is changed, enabling tuning of the optical properties of the sample.
Applied Physics A, 2020
In this study, the surface plasmon effects of the Ag nanoparticle were investigated depending on the substrate temperature and coating time. Deposition procedure for the Ag coating was the vacuum deposition at low substrate temperature (< 300 K) instead of the commonly used the vacuum deposition at high substrate temperatures. The Ag thin films were deposited on n-type Si, glass and solar cell with safety glass substrates. The structural and optical characteristics of the Ag thin films prepared on Si and glass substrates were investigated. The Ag thin films had a polycrystalline structure with cubic phase. The (111) preferred orientation for 300 K substrate temperature was changed to (200) after 200 K substrate temperature. Homogeneous nano-sized Ag particles on Si were obtained at the 150-200 K temperature range. Optical measurements were performed for the Ag thin films prepared on glass substrates. According to reflectance measurements, plasmon resonance effect of the Ag nanoparticles was observed around 435-540 nm. The Ag nanoparticles prepared on solar cell at low substrate temperature increased the solar cell efficiency for all coating time because the nanoparticle size and shape were not changed significantly with the coating time. However, the Ag thin films prepared at high substrate temperature decreased device efficiency with the increasing coating time.
Colloidal Synthesis and Structural Characterizations of Silver Nanoparticles by using Wet Chemistry
Abstract: In this paper we present the synthesis of silver nanoparticles colloids by using wet chemistry method. Silver nanoparticles were successfully prep ared in an aqueous system at room temperature and u nder ambient pressure. The colloidal silver was incorpor ated by dip-coating to the glass substrate. The pro duct was characterized with X-ray diffraction (XRD), Atomic Force Microscopy (AFM), thermal gravimetric analysi s (TGA). X-ray diffraction spectrum of the nanopartic les confirmed the formation of face-centered-cubic form of metallic silver nanoparticles with preferred orient ation along (111) plane. The Atomic Force Microscop y shows that the silver nanoparticles are of spheric and re latively uniform. The optimum molar ratio [Urea]/[A g+] and molecular weight of PVP for the formation of Ag nan oparticles in various solutions were [Urea]/[Ag+]=4 and PVP=55000 which optimize the formation efficiency, reduces the size, enhance dispersity and prevents aggregation of the prepared nanoparticles.
The formation and characterisation of ultra-thin films containing Ag nanoparticles
Journal of Materials Chemistry, 2008
A simple three step method for creating ultra-thin films, which contain Ag nanoparticles, on both glass and stainless steel surfaces, is presented. First, during the immersion into N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane (DIAMO) a monolayer of DIAMO is attached on the sample surface after which immersion in silver nitrate is performed and a complex between the two amino groups of DIAMO and silver ions forms, leading to large clusters on the surface. During the annealing step these silver containing clusters are converted into silver nanoparticles which are homogeneously distributed and bound to the surface. The formation of the film was characterised using UV/Vis, FE-SEM and FE-AES. Additionally, SERS activity of the surface and the effect of the attachment of the nanoparticles on their antibacterial nature were also investigated. { Electronic supplementary information (ESI) available: 1) A typical AFM image and height profile of the annealed sample surface; 2) maps of N and Si peak intensities measured by FE AES of the pure DIAMO coated sample. See