Structural, Optical and Magnetic Investigation of Ni, Co and Mn doped SnO2 Nano particles Synthesized by Chemical Co-precipitation.

2016 ◽  
pp. 3241-3251
Author(s):  
N. Makram
Keyword(s):  
Optical Measurement ◽  
Bulk Material ◽  
Sno2 Nanoparticles ◽  
Quantum Confinement Effect ◽  
Xrd Analysis ◽  
Nano Particles ◽  
Visible Absorption ◽  
Magnetization Measurements ◽  
Co Precipitation ◽  
Co Doped

Pure and transition metal dopednano-crystalline Sn1-xTMxO2 (x = 0.0, 0.05, TM = Ni, Co and Mn)were synthesized in aqueous solution by chemical Co-precipitation technique. X- ray diffraction (XRD), high resolution transmission electron microscope (HR-TEM), electron diffraction,UV – visible absorption spectroscopy and room temperature magnetization measurements were performed to investigate the structural and microstructural, morphology, optical and magnetic properties of pure and doped samples. The structure calculations revealed that Co and Ni atoms have been incorporatedin the SnO2hostlattice.For Mn, the XRD analysis detected that SnO phase was formed instead during the synthesis process.HRTEM and XRD studies indicated that the particle size is in the range of quantum dot size except for Mn. For optical measurement, the quantum confinement effect was suggested to be the dominant reason for the great increase of the optical bandgap with respect to the bulk material. Magnetization measurements revealed that all doped samples were ferromagnetic in nature. Well defined strong hysteresis loop was detected for Co doped SnO2 nanoparticles. It was suggested that the ferromagnetism is intrinsic in origin.It is not due to ferromagnetic metal clusters nor due to the presence of additional ferromagnetic phases. The strong ferromagnetic signal especially for Co doped SnO2makes it a candidate for spintronic applications.

Up-Conversion Luminescence Properties of Gd2O2S:(Yb3+,Er3+) Nano-Particles Synthesized by a Co-Precipitation Method

2011 ◽  
Vol 299-300 ◽  
pp. 546-549
Author(s):  
Xing Li ◽  
Jing Bao Lian
Keyword(s):  
Single Phase ◽  
Xrd Analysis ◽  
Hydrogen Atmosphere ◽  
Nano Particles ◽  
Infrared Light ◽  
Precipitation Method ◽  
Luminescent Intensity ◽  
Light Excitation ◽  
Co Precipitation ◽  
Co Doped

A co-precipitation method for synthesizing Gd2O2S:(Yb3+,Er3+) nano-particles was developed, using the commercially available Gd2O3, Er2O3, Yb2O3, H2SO4 and NaOH as the starting materials. XRD analysis shows that the precursor can be transformed into single phase Gd2O2S nano-particles by calcining at 900 °C for 1 hour in hydrogen atmosphere. TEM observation shows that the Gd2O2S particles are quasi-spherical in shape and well dispersed, with a mean particle size of about 20-30 nm. Under 980nm infrared light excitation, the strongest emission bands of Gd2O2S:Er3+ nano-particles located at green region centered at 525 nm and 550 nm, attributing to the 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions of Er3+ ions, respectively. The quenching concentration of Er3+ ions is 5 mol%. The up-conversion luminescent intensity increases obviously for Yb3+ and Er3+ co-doped Gd2O2S:(Yb3+,Er3+) nano-particles.

Synthesis, Structure and Optical Properties of NiTi Shape Memory Thin Films

2021 ◽  
pp. 2150015
Author(s):  
Nagham M. Hamed ◽  
Saeed Naif Turki Al-Rashid
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Shape Memory ◽  
Laser Energy ◽  
Quantum Confinement Effect ◽  
Xrd Analysis ◽  
Spherical Particles ◽  
Niti Shape Memory Alloy ◽  
Visible Absorption ◽  
Glass Substrates

NiTi Shape Memory Alloy (SMA) is now widely used in important applications due to its shape memory effect (SME) and biocompatibility. However, there is still a challenge to control the sizes and shapes of these nanoparticles. Here, we report on the use of pulsed laser deposition technique for the cultivation of NiTi nanoparticles on glass substrates. It discussed the implications of the case of the influence of depositing laser energy on the size of a grain of NiTi nanoparticle. The nominated effect on the optical properties of its thin-film was also discussed. X-ray diffraction (XRD) analysis revealed that the films prepared at 800[Formula: see text]mJ, 900[Formula: see text]mJ and 1000[Formula: see text]mJ were amorphous structures. The Atomic Force Microscopy (AFM) results confirmed that the thin films are made up of spherical particles that are evenly distributed (in terms of size). A blueshift in the bandgap was observed in the UV–Visible absorption spectra with increase in the depositing laser energy due to the quantum confinement effect of nanoparticle formation.

Anomalous Behavior of Chemically Synthesized Magnetoplumbite Strontium Ferrite Nano Particles

2012 ◽  
Vol 510-511 ◽  
pp. 330-334 ◽  
Author(s):  
G. Asghar ◽  
S. Nasir ◽  
M.S. Awan ◽  
G.H. Tariq ◽  
M. Anis-ur-Rehman
Keyword(s):  
Dielectric Loss ◽  
Permanent Magnets ◽  
Xrd Analysis ◽  
Anomalous Behavior ◽  
Nano Particles ◽  
Precipitation Method ◽  
X Ray ◽  
Crystallite Sizes ◽  
Co Precipitation ◽  
New Applications

Strontium hexa-ferrite nanoparticles were prepared successfully by simple co-precipitation method. The XRD analysis confirmed the formation of single phase MFe12O19(M=Sr). Parameters such as crystallite size, lattice constant, X-ray density and porosity were calculated from the X-ray diffraction data. The crystallite sizes were in the range 12-26 nm. The temperature dependent dc electrical resistivity measurements showed that the material was highly. Dielectric constant and dielectric loss factor (tanδ) were measured in the frequency range 20Hz-3MHz. The anomalous behavior of dielectric loss revealed a very important behavior of the prepared sample of SrFe12O19in different frequency regions and that could be used for new applications of this material. The magnetic properties were determined from the hystersis loop obtained from vibrating sample magnetometer (VSM). The Curie temperature was determined by susceptometer. This material is potentially suitable for use as a recording medium in identification cards and credit cards and for the fabrication of permanent magnets.

Preparation and Characterization of Ag and Co Doped ZnO Nano Particles

2012 ◽  
Vol 584 ◽  
pp. 248-252
Author(s):  
B. Sankara Reddy ◽  
S. Venkatramana Reddy ◽  
R.P. Vijaya Lakshmi ◽  
N. Koteeswara Reddy
Keyword(s):  
Blue Emission ◽  
Photo Luminescence ◽  
Hexagonal Structure ◽  
Nano Particles ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation ◽  
Co Doped

Pure ZnO and Ag, Co doped ZnO nano particles [Zn1-xAgxCoyO, where x = 0.00 and 0.05, y = 0.05] were synthesized by chemical co precipitation method without use of surfactant. All the prepared samples calcinated in 1 hour at 500oC, after that the morphology of the samples were evaluated by Scanning Electron Microscope (SEM). The X- ray diffraction (XRD) results indicated that the synthesized co-doped ZnO nano crystals had the pure hexagonal structure without any significant change in the structure affected by Ag and Co substitution. Dopant elements Ag and Co are present in the ZnO host material and conformed by Energy Dispersive Analysis of X-ray Spectra (EDAX). The incorporation of Ag+ in the place of Zn2+ has made a considerable decrease in the size of nano crystals as compared to pure ZnO nano particles (It is to be noted that Co should be kept constant at 5 mol %). Blue emission was observed by Photo Luminescence (PL) Spectra.

scholarly journals Microbial Study on NiO – CuO Nano Particles by Grinding Technique

2021 ◽  
Author(s):  
S Ramakrishnan ◽  
R. Vaishnavi ◽  
S. Ramakrishnan ◽  
M. Revathi ◽  
S. Rajakarthihan
Keyword(s):  
Metal Oxide Nanoparticles ◽  
Fungal Growth ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Nano Particles ◽  
Diffusion Method ◽  
Bacterial Strains ◽  
Visible Absorption ◽  
Grinding Technique ◽  
Bacteria And Fungi

Abstract One of the biggest concerns around the world seems to be the fight against bacteria and fungi. This major challenge can be overcome with the addition of a combination of metal and metal oxides. Metal oxide nanoparticles have emerged as effective antimicrobial and anti-fungal agents. In this work, A Grinding technique has been used to synthesize NiO – CuO nanoparticles. Nanoparticles were characterized using X-ray powder diffraction (XRD) analysis which confirmed the formation of all the phases, Fourier Transform-Infrared Spectroscopy (FTIR), UV–Visible Absorption Spectroscopy and Scanning Electron Microscope (SEM) analysis were showed the vibrational structure, optical and uniformity of particle size of the nanoparticles. Bacterial and fungal growth study was confirmed by the disc diffusion method. The prepared nanoparticles showed detrimental effects against Streptococcus, Staphylococcus aureus (bacterial strains), and Aspergillus Niger (fungal strains). A concentration-dependent growth inhibition effect of nanoparticles on both bacteria and fungi was observed. The prepared composites were better active in both bacteria and fungies.

Synthesis and Characterization of Co-Doped ZnO Diluted Magnetic Semiconductor for Spintronics Application

2020 ◽  
Vol 12 (4) ◽  
pp. 524-529
Author(s):  
C. Thirupathi ◽  
S. Nithiyanantham ◽  
M. Sentilkumar ◽  
A. Arivudainambi ◽  
S. Mahalakshmi ◽  
...  
Keyword(s):  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Ferromagnetic Exchange ◽  
Doped Zno ◽  
Diluted Magnetic ◽  
Co Precipitation ◽  
Co Doped

The diluted magnetic semiconductor (DMS), are promising materials in the ferromagnetic exchange coupling between localized spins. ZnO nanoparticles in pure and cobalt doped with 2%, 4%, 6% and 8% were prepared through co-precipitation method at room temperature. XRD analysis showed the Co doped ZnO crystalizes in a wurzite structure. The particle size decreases with increase in concentration of cobalt. The SEM micrographs shows similar and regular equal in size depends with the increase of Co concentration and formation of spherical super structure and confirmed the Co2+ is completely replaced into the Zn2+ site of ZnO host structure. The size depends with the concentration are evident from EDAX analysis. The remarkable spin performances with increase of Co are confirming the above results.

SYNTHESIS AND CHARACTERIZATION OF NICKEL DOPED CdS NANOPARTICLES

2012 ◽  
Vol 11 (03) ◽  
pp. 1240006 ◽  
Author(s):  
B. SRINIVASA RAO ◽  
V. RAJAGOPAL REDDY ◽  
B. RAJESH KUMAR ◽  
T. SUBBA RAO
Keyword(s):  
Optical Properties ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Cds Nanoparticles ◽  
Ni Doping ◽  
Visible Absorption ◽  
Good Crystallinity ◽  
Vis Spectroscopy ◽  
Xrd Patterns ◽  
Co Precipitation

In the present work, conventional chemical co-precipitation method was employed for the preparation of Nickel (2, 4, 6, 8 and 10 at.% of Ni ) doped CdS nanoparticles. The crystallite size and lattice parameters for each sample are determined from X-ray diffraction (XRD) analysis. From XRD patterns the broadening of the diffraction peaks indicates the nanostructure nature of the samples. Surface morphology of the samples was studied by scanning electron microscope (SEM). UV-Visible absorption spectra for prepared samples are monitored for the optical properties of quantum sized particles. All nanoparticles formed lie in the size quantization regime and exhibit good crystallinity. Optical properties have been observed via UV-Vis spectroscopy and Photoluminescence spectra (PL) spectra. Ni doping in CdS is found to modify the luminescence properties by creating shallow acceptor states.

scholarly journals Preparation and Characterization of Visible-Light-Activated Fe-N Co-Doped TiO2and Its Photocatalytic Inactivation Effect on Leukemia Tumors

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kangqiang Huang ◽  
Li Chen ◽  
Jianwen Xiong ◽  
Meixiang Liao
Keyword(s):  
Electron Microscope ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Light Therapy ◽  
Cell Counting ◽  
Visible Absorption ◽  
X Ray ◽  
Photocatalytic Inactivation ◽  
Inactivation Efficiency ◽  
Co Doped

The Fe-N co-doped TiO2nanocomposites were synthesized by a sol-gel method and characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). Then the photocatalytic inactivation of Fe-N-doped TiO2on leukemia tumors was investigated by using Cell Counting Kit-8 (CCK-8) assay. Additionally, the ultrastructural morphology and apoptotic percentage of treated cells were also studied. The experimental results showed that the growth of leukemic HL60 cells was significantly inhibited in groups treated with TiO2nanoparticles and the photocatalytic activity of Fe-N-TiO2was significantly higher than that of Fe-TiO2and N-TiO2, indicating that the photocatalytic efficiency could be effectively enhanced by the modification of Fe-N. Furthermore, when 2 wt% Fe-N-TiO2nanocomposites at a final concentration of 200 μg/mL were used, the inactivation efficiency of 78.5% was achieved after 30-minute light therapy.

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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