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Preparation and Characterization of Silver Doped ZnO ..
HRTEM Studies: The HRTEM images of the Zn0.80Ag0.20O1-δ nanoparticles are shown in Fig. 6 (a, b, c and d). Fig. 6 (a, b and c) displays the TEM images of Zn0.80Ag0.20O1-δ which indicate the presence of nano rod like a structure in the samples. From the TEM micrograph, the diameter of the Ag doped zinc oxide was found to be approximately 50 to 150 nm length and 200 to 100 nm with one dimension of rod. As reported in the literature, the doping of silver with zinc oxide nanomaterial changes from spherical to rod shaped Ag: ZnO particles 13. Fig. 6c clearly shows the presence of doped silver in the ZnO phase. From the single electron diffraction (SAED) pattern (Fig. 6d) the measured d-spacing values (0.26 and 0.20 nm as indicated in the figure) correspond to the single crystal planes of hexagonal ZnO (002) and cubic silver (200). The obtained results from the TEM are in good agreement with the XRD data.
XRD Studies: Fig. 1 (a, b, c and d) shows XRD pattern of the Ag doped ZnO nanoparticles (Zn0.95Ag0.05O1-δ, Zn0.90Ag0.10O1-δ, Zn0.85 Ag0.15O1-δ and Zn0.80Ag0.20O1-δ) prepared by chemical precipitation method. All peaks can be assigned to the standard hexagonal phase of zinc oxide (JCPDS No. 89 - 1397) and (111), (200) and (220) crystallographic planes of the cubic phase of silver (JCPDS No. 89 - 3722). No other crystalline phase was formed. It is clearly observed that the diffraction peaks become sharper and stronger due to the high temperature treatment (600 °C for 2 hours) which suggests that the crystalline quality of the materials is improved 9.
Green Synthesis of ZnO Nanoparticles, its Characterization and ..
Optical sensing plays an important role in theranostics due to its capability to detect hint biochemical entities or molecular targets as well as to precisely monitor specific fundamental psychological processes. Rare-earth (RE) doped upconversion nanoparticles (UCNPs) are promising for these endeavors due to their unique frequency converting capability; they emit efficient and sharp visible or ultraviolet (UV) luminescence via use of ladder-like energy levels of RE ions when excited at near infrared (NIR) light that are silent to tissues. These features allow not only a high penetration depth in biological tissues but also a high detection sensitivity. Indeed, the energy transfer between UCNPs and biomolecular or chemical indicators provide opportunities for high-sensitive bio- and chemical-sensing. A temperature-sensitive change of the intensity ratio between two close UC bands promises them for use in temperature mapping of a single living cell. In this work, we review recent investigations on using UCNPs for the detection of biomolecules (avidin, ATP, ), ions (cyanide, mecury, ), small gas molecules (oxygen, carbon dioxide, ammonia, ), as well as for temperature sensing. We also briefly summarize chemical methods in synthesizing UCNPs of high efficiency that are important for the detection limit.
SOFT CHEMICAL SYNTHESIS OF Ag DOPED ZnO NANOPARTICLES: ANTIMICROBIAL ACTIVITY AND IN VIVO ACUTE NANOTOXICOLOGICAL IMPACT ON SWISS ALBINO MICE
Zinc oxide is an inorganic compound with the formula Zn O
The dielectric properties of the synthesized NPs were examined via LCR meter. The pellets of undoped, 3% and 5% Cu doped ZnO nanoparticles were made with help of hydraulic presser. Then these pellets were sintered in an electric oven at 280 ° C for 2 h. The circular faces of the prepared pellets were coated with silver paste for making electrical contacts. The AC measurements (dielectric constant and loss factor) were carried out at room temperature in the frequency range of 0 kHz-3 MHz. The dielectric constant (ε ′ ) was calculated from the equation
The chemicals used for the synthesis of undoped ZnO and Cu doped ZnO NPs were ZnCl2, CuCl2· 5H2O, NaOH and CH3COOH. A chemical co-precipitation technique was adopted for the preparation of undoped and Cu doped ZnO nanoparticles. 0.1 mol/L solution of ZnCl2 solution was prepared in distilled water and after magnetic stirring for 20 min acetic acid was added. The pH value of ZnCl2 solution was adjusted to 8 by drop-wise addition of 1 mol/L NaOH solution. Then the solution was vigorously stirred for 1 h to complete the chemical reactions. After 1 h, the solution was aged and then precipitates were collected, washed and then dried. For Cu doping the same procedure was adopted except the addition of CuCl2· 5H2O with various molar ratios to ZnCl2 for 1%, 3%, 5% and 10% Cu (weight percent) doping. The dry cleaned precipitates were finally annealed at 300 ° C for 3 h. The structural properties of the synthesized samples were examined by X-ray diffraction (XRD) using PANalytical X-ray diffractrometer (Model: 3040/60 X'Pert PRO made in Netherlands). The surface morphologies, grain sizes and chemical compositions of the samples were analyzed by scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) (JEOL, SEM, Model JSM6490LA). Raman spectra of prepared nanoparticles were recorded by Raman spectrometer of Ramboos (DangWoo Optron, Korea). LCR meter (Model 6440B by Wayne Kerr electronics) has been used to study the Cu doping induced effects on the dielectric properties of ZnO NPs.
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Journal of Nanoscience and Nanotechnology
of nano zinc oxide.
dissolution and aggregation of zinc oxide nanoparticles at circumneutral ph; a study of size effects in the presence and absence of citric.
Synthesis and Characterization of Al Doped ZnO Nanoparticles 631 microstructural variations and optical property were systematically characterized.
Indium doped ZnO nano-powders prepared by RF thermal plasma treatment of In 2 O 3 and ZnO thesis of nano-powders, these experimental results indicate.
Use of nano zinc oxide in natural rubber 4.1 Introduction 4.2 Experimental 4.3 Results and discussion 4.4 Conclusions 4.5 References.
Both nano and bulk ZnO nanoparticles showed antimicrobial activity against selected pathogens but maximum activity (26/23 mm) was observed in S.
Materials | Free Full-Text | Zinc Oxide—From Synthesis …
Nano MgO sees good future in producing coating.
Research Article ISSN : 0975-7384 CODEN into account above claims, to investigate the enhanced antimicrobial and antifungal properties of nano-zinc oxide.
SYNTHESIS AND CHARACTERIZATION OF ZnO NANO-PARTICLES Zinc Oxide (ZnO) nanoparticles were prepared by wet chemical method using zinc nitrate and sodium.
Growth and Characterization of ZnO Nanostructures who helped me during my thesis work.
Surface modification, functionalization and …
Synthesis and Characterization of Nanoparticles and Nanocomposite of ZnO and MgO by Sonochemical Method.
SYNTHESIS AND CHARACTERIZATION OF ZnO NANO-PARTICLES Zinc Oxide (ZnO) nanoparticles were prepared.
DSpace @ MIT Hydrothermal synthesis of Al-doped ZnO nanowires and their application for photovoltaic devices Research and Teaching Output of the MIT Community.
ZnO based advanced functional nanostructures: synthesis, properties and applications Mashkoor Ahmad and Jing Zhu* Received 28th May 2010, Accepted.
International Journal of Nanomedicine - Dove Press
CONCLUSION: Chemical precipitation technique was effectively used to prepare different compositions of Ag doped ZnO nanoparticles. The XRD results indicated the presence of hexagonal phase of zinc oxide and cubic phase of silver in all the samples. The FTIR results exhibited the stretching mode of Ag-O and Zn-O in the samples. The particle size data inferred that the particle size gets increased with the increase in the dopant concentration of silver in ZnO. SEM micro structures confirmed presence of particles in the range of 90 to 320 nm. The EDAX spectra exhibited the presence of elements as per the stoichiometric composition in the samples.
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