Optical, Morphological And Photoluminescence Spectroscopic Studies Of Pva / Agno3films After Γ Irradiation

Silver is an element that is found on the Periodic Table. The element silver is symbolized on the periodic table with the letters Ag. The symbol Ag of silver comes from a latin word for silver which is argentum. Silver on the Periodic Table is found in group 11. Silver has an atomic number of 47. The atomic number determines the chemical properties of an element and is placed on the top of the symbol on the periodic table. The mass number of the element silver is 107. To determine the atomic number you use the number of protons and neutrons in the element. Silver has 60 neutrons which is a subatomic particle found in the nucleus of every

This shift in the binding energy to a lower value is not only because of an intense interaction between Ag and ZnO, but also electron transfer from the Ag core to the ZnO shell. These results are in good agreement with the UV–visible absorption, PL spectra, and other Ag@ZnO CSNS reported in the literature [39]. Fig. 5d shows that the O 1s peak at 530.6 eV coincided with that of the oxygen in the ZnO lattice [40].

"Silver Chloride (AgCl) - Properties and Applications." Silver Chloride (AgCl) - Properties and Applications. The A to Z of Materials, 2013. Web. 18 Feb 2014. <http://www.azom.com/article.aspx?Articl

In order to explore novel physical properties and phenomena and realize potential applications of nanostructures and nanomaterials, the ability to fabricate and process nanomaterials and nanostructures is the first corner stone in nanotechnology. There exist a number of methods to synthesize the nanomaterials, which are categorized in two techniques “top down and bottom up”. Solid state route, ball milling comes in the category of top down approach, while wet chemical routes like sol-gel, co-precipitation, etc. come in the category of bottom up approach. Secondly, characterization of nanomaterials is necessary to analyze their various properties. Therefore, this chapter describes the various methods of synthesis and characterization of nanomaterials. Characterization techniques include XRD, SEM, TEM, EDAX, UV-Visible spectroscopy, FTIR spectroscopy, etc.

Synthesis of OA-Ag NPs: For the preparation of OA-stabilized Ag NPs [39], silver trifluoroacetate (0.4 g), OA (3.5 mL), and isoamyl ether (30 mL) were mixed in a 250 mL three-neck flask under argon. The mixture was heated at 160 °C for 30 min then cooled to room temperature by removing the heat source. The purification process was performed four times using excess polar solvent (ethanol) and centrifugation. The precipitated OA-Ag NPs were dispersed in

Silver (Ag) is a metallic element with the atomic number of 47. A soft, white, lustrous transition metal possesses the highest electrical conductivity, thermal conductivity and reflectivity of any metal. Silver occurs in its pure, free form as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. More abundant than gold, silver metal has functioned in many pre modern monetary systems as coinable specie, sometimes even alongside gold.

The purity of the ingredients is essential for making true colloidal silver, for impurities will transform the solution into a different substance. Even the minerals in spring water will undergo unpredictable chemical transformations,

Silver nanoparticles were synthesised using a simple method described by Hiramatsu [Hir01]. For the

Silver has been used since Roman times as a disinfectant because of its well-known antimicrobial properties. AgNPs are considered attractive building blocks for nanomaterial architectures based upon the nanoparticles size and shape (Shipway etal 2000).

Gold(III) chloride solution and sodium citrate solution were freshly prepared with deionized water and filtered through a syringe filter (0.22 µm). Deionized water (45 mL) was added into three-neck flask incubated in the heating mantle with a stirring bar followed by the addition of HAuCl4 solution (5 mL, 10 mM). After the solution was boiling, the sodium citrate solution (5 mL, 38.8 mM) was added quickly. The color of the mixture gradually changed from black to wine red in the first two minutes, indicating the formation of gold nanoparticles. The AuNPs solution was kept boiling for another 10 minutes with a stirring speed of 700 rpm. After cooling down the solution to room temperature, the AuNP solution was filtered through a syringe filter (0.22µm). The concentration of AuNPs was determined by UV-Vis spectrometer (Cary100,

Bacteria have long since existed alongside humans, and while some are not harmful, there are many that are. Plants are commonly used natural remedies for diseases, and have been known to retain immense antibacterial properties that can fight bacteria. Silver nanoparticles have been also known to possess antimicrobial properties that aid in the fight against various bacteria. The use of plants as well as silver nanoparticles to fight against bacteria has caused much interest in the nanotechnology and medicine fields, and has been the basis of many studies. The purpose of this paper is to scrutinize the antimicrobial potency of silver nanoparticles, and how they may be utilized to fight against various harmful bacteria.

At small sizes, the flexibility of a particle to scatter lightweight of various wavelengths is predicated on particle size. An example of this is zinc oxide, which appears white in sunscreen once the particles are macroscale, however transparent when the particles are nanoscale. In a similar fashion, thin films composed of our silver nanowires are extremely clear albeit they are composed a material that is opaque at a macroscale.

On exposure to air or light in the presence of organic matter, silver nitrate becomes grey or greyish-black, and in the presence of traces of nitric acid, silver nitrate is stable to 350°C.

The influence of gamma irradiation on the electrical and dielectric properties of AgNO3/ PVA films was investigated. The films were prepared by in-situ chemical reduction techniques, then irradiated with different gamma doses (25, 50, 75, 100, 125 KGy). The content of the Ag in the PVA film were determined by using atomic absorption spectroscopy (AA), and were found to be 0.4 wt %. The films have been characterized through dielectric spectroscopy and I–V measurements. As a result, the dielectric constant (ε) value decreases as the gamma irradiation doses increase. The conductivity of the films and dielectric loss (tan δ) of increases with increasing the gamma irradiation doses. The conductivity was found (σ = 4.9 x10−8 S m−1) for 125 KGy. Frank-poole emission is the prevailing transport mechanism for all samples.

Thus, numbers of articles devoted to ZnO photoelectrode with the aim of enhancing efficiency by reducing the charge recombination, and improving electrical/optical performance [9-12]. In this regard, doping is the most advantageous approach to modify ZnO structure. Different kind of metals such as lanthanum [13] aluminum [14], tin [15], magnesium [16], titanium [17] has been widely investigated in ZnO photoelectrode for improving the performance. Moreover, earlier reports on the DSSC have proven that the active area is directly proportional to the power conversion efficiency [18]. Therefore, we attempted to incorporate indium to improve above cited aspects with an idea working area (0.25cm2) of prototype DSSC. Indium (In3+) chosen as dopant, because it has a noteworthy contribution in transparent conducting oxide materials and much work devoted in indium doped ZnO as a transparent conducting oxide film [19-20]. Owing to their remarkable properties such as high electronegativity, minute native lattice distortion with preferable chemical stability make indium as suitable donor than other elements for finding high quality ZnO based transparent conducting oxide with excellent conductivity in DSSCs [21]. Rama Krishna Chava et al. reports the trivalent indium substitution in zinc oxide nanoparticles enhance the carrier concentration