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.

Photocatalytic Activity of Fe-Doped ZnO/Montmorillonite Nanocomposite for Degradation of Malachite Green

2015 ◽  
Vol 827 ◽  
pp. 19-24 ◽  
Author(s):  
Nur Afifah ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Activity ◽  
Malachite Green ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spin Resonance ◽  
Doped Zno ◽  
Co Precipitation

In this study, the photocatalytic activity of pure Fe- doped ZnO and Fe- doped ZnO/Montmorillonite nanocomposite has been investigated for the degradation of malachite green under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, and electron spin resonance. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to pure Fe- doped ZnO. To detect the possible reactive species involved in degradation of organic dyes control experiments with introducing scavengers into the solution of organic dyes were carried out. It is found that electron plays an important role in the degradation of malachite green.

Photocatalytic Activity of Zeolite Supported Transition Metal-(Co2+ and Cr2+) Doped ZnO: Comparative Study

2015 ◽  
Vol 827 ◽  
pp. 43-48
Author(s):  
Annisa Noorhidayati ◽  
Mia Putri Rahmawati ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Transition Metal ◽  
Zno Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Transition Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation

Transition metal ions (Co and Cr) doped ZnO nanoparticles supported on natural zeolite were synthesized using co-precipitation method. The synthesized samples were characterized by means of X-ray diffraction, energy dispersive X-ray, Fourier-transform infrared absorption, and UV-visible diffuse reflectance spectroscopy. The samples were further used as photocatalyst for degradation of methyl orange and methylene blue in aqueous solutions under UV light irradiation. The results showed that zeolite supported Cr-doped ZnO nanoparticles is more efficient compared with zeolite supported Co-doped ZnO nanoparticles. It is also revealed that zeolite supported samples possessed higher photocatalytic efficiency compared to bare samples.

Synthesis and Luminescence Properties of Yb3+/Ho3+ Co-Doped Lu2O3 Nanocrystalline Powders

2007 ◽  
Vol 280-283 ◽  
pp. 521-524
Author(s):  
Li Qiong An ◽  
Jian Zhang ◽  
Min Liu ◽  
Sheng Wu Wang
Keyword(s):  
Electron Microscopy ◽  
Upconversion Luminescence ◽  
Nanocrystalline Powders ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
X Ray ◽  
Transmission Electron ◽  
Co Precipitation ◽  
Co Doped

Yb3+ and Ho3+ co-doped Lu2O3 nanocrystalline powders were synthesized by a reversestrike co-precipitation method. The as-prepared powders were examined by the X-ray diffraction and transmission electron microscopy. The phase composition of the powders was cubic and the particle size was in the range of 30~50 nm. Emission and excitation spectra of the powders were measured by a spectrofluorometer and the possible upconversion luminescence mechanism was also discussed.

Concentration-Dominated Temperature-Dependence of Upconversion Luminescence in Gd6WO12 Nanophosphor Co-Doped with Er3+ and Yb3+

2016 ◽  
Vol 16 (4) ◽  
pp. 3534-3541
Author(s):  
Yanqiu Zhang ◽  
Baojiu Chen ◽  
Xiangping Li ◽  
Jiashi Sun ◽  
Jinsu Zhang ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Thermal Quenching ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Two Photon ◽  
Microscopic Morphology ◽  
Co Precipitation ◽  
Co Doped ◽  
Scanning Electron

Nanosized Gd6WO12 phosphors containing various Er3+ concentrations and fixed Yb3+ concentration were synthesized by a co-precipitation method. The crystal structure and microscopic morphology of the obtained nanophosphors were characterized by means of X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Two-photon processes for both the green and red upconversion (UC) emissions were confirmed by analyzing the dependence of UC intensities on 980 nm laser working current. UC emission intensity changing with temperature displays different trends for the samples with different Er3+ concentrations. The experimental results indicated that thermal quenching behavior of UC luminescence could not be simply explained by crossover mechanism. The enhancement for green UC emission in the sample with higher Er3+ concentration was discussed. Finally, the Er3+ concentration dependence of UC luminescence was experimentally observed, and its mechanisms were analyzed.

scholarly journals Synthesis, structural and optical properties of ZnS nano-particles

2010 ◽  
Vol 7 (1) ◽  
pp. 195-200
Author(s):  
K. K. Dubey ◽  
V. Nayar ◽  
P. S. Choudhary
Keyword(s):  
Band Gap Energy ◽  
Hexagonal Structure ◽  
Nano Particles ◽  
Precipitation Method ◽  
Excitation Wavelength ◽  
X Ray Diffraction ◽  
Prepared Material ◽  
Absorption Experiment ◽  
Zinc Sulfide Nanoparticles ◽  
Co Precipitation

Zinc Sulfide nanoparticles were prepared by chemical rout i.e. co-precipitation method. X-ray diffraction profiles of ZnS have been conformed as single phase with hexagonal structure. And crystalline in nature. The lattice parameters of prepared material is a= 3.8314A0 c=6.2431A0 with space group P63mc. The particle size was determined by scherer formula and found to be 28 nm. The band gap energy of ZnS nanoparticles was determined by optical absorption experiment and found to be 3.68 eV at 300oK. Photoluminescence spectra ware recorded by luminescence spectrophotometer. All the plots contains two peak centered at 315 nm and 425 nm. The excitation wavelength was 250 nm. Appearance of broad peaks centered at 425 nm is attributed to the presence of sulphur vacancies in the lattice.

The Influence of Montmorillonite Incorporation in Mn-Doped ZnO Nanoparticles for Photocatalytic Degradation of Organic Dyes

2015 ◽  
Vol 1112 ◽  
pp. 194-200
Author(s):  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Zno Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation ◽  
Mn Doped

The present study compares the photocatalytic decolorization ability of bare Mn-doped ZnO and montmorillonite modified Mn-doped ZnO nanoparticles towards aqueous solution of organic dyes (methylene blue and malachite green) under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, electron spin resonance, and diffuse reflectance spectroscopy. Comparison of degradation efficiency demonstrated that montmorillonite modified Mn-doped ZnO nanoparticles exhibited higher activity than bare Mn-doped ZnO nanoparticles.

scholarly journals Pure and SrBa Dual Doped ZnO Nanoparticles Prepared by Co-precipitation Method and Their Structural, Optical and Antimicrobial Properties

2019 ◽  
Vol 11 (06) ◽  
Author(s):  
M Karthikeyan ◽  
A Jafar Ahamed ◽  
P Vijaya Kumar
Keyword(s):  
Antimicrobial Properties ◽  
Morphological Properties ◽  
Precipitation Method ◽  
Bacterial Strains ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Doped Zno ◽  
Xrd Studies ◽  
Co Precipitation

The present investigation, the successful preparation of pure ZnO (Z1) NPs and SrBa dual doped ZnO (Z2) NPs by chemical co-precipitation technique without use of any capping agent. The structural and morphological properties of Z1 and Z2 NPs were analyzed using X-ray diffraction (XRD) studies, Field emission scanning electron microscopy (FESEM), Elemental analysis (EDAX), Fourier transform infrared spectroscopy (FTIR). An optical property was studied by UV–Vis spectroscopy and Photoluminescence (PL) spectra. The antimicrobial activity of Z1 and Z2 NPs has been investigated against Staphylococcus aureus and Klebsiella pneumoniae bacterial strains. It has been interestingly observed that Z2 NPs has enhanced the inhibitory activity than that of Z1 NPs against S. aureus and more efficiently than the K. pneumoniae bacterial strain.

scholarly journals Resistivity Enhancement of Sr-Hexaferrite Using Rare Earth Dopant to Minimize Energy Losses

2018 ◽  
Vol 778 ◽  
pp. 195-199 ◽  
Author(s):  
Nahall Niazi ◽  
Omer Farooq ◽  
Fatima Tuz Zahra ◽  
Muhammad Anis-ur-Rehman
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Strontium Hexaferrite ◽  
Energy Losses ◽  
X Ray Diffraction ◽  
High Frequencies ◽  
X Ray ◽  
Co Precipitation

Strontium hexaferrite is a material of choice due its various magnetic applications. Energy losses are a prominent issue in these magnetic materials. To lower these energy losses, we need to improve the resistivity by reducing eddy current losses. In this work nanoparticles of Gadolinium (Gd) doped Sr-hexaferrite (SrFe12-xGdxO19 x =0 .0, 0.1) have been synthesized by co-precipitation method. Structural analysis was done by using X-ray diffraction technique (XRD). It was found that the formation of single phase i.e. hexagonal structure has been achieved when the samples were sintered at 920°C for 20 minutes. AC electrical properties such as conductivity (𝜎ac), dielectric constant (ε′), dielectric loss (tanδ) and impedance (Z); real (Z') and imaginary (Z") parts have been studied as a function of frequency at room temperature. Aim of the work was to enhance the resistivity and was successfully achieved. Gd doped sample is proposed as an energy efficient material to be used in devices working at high frequencies.

STUDY OF STRUCTURAL AND MAGNETIC PROPERTIES OF Co-DOPED In2O3 NANOPARTICLES

2011 ◽  
Vol 10 (04n05) ◽  
pp. 961-965 ◽  
Author(s):  
RAM PRAKASH ◽  
JUNG IL SONG ◽  
SHALENDRA KUMAR ◽  
CHAN GYU LEE
Keyword(s):  
Room Temperature Ferromagnetism ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Dc Magnetization ◽  
X Ray ◽  
Sem Micrograph ◽  
Magnetization Hysteresis Loop ◽  
Co Precipitation ◽  
Co Doped

In the present work, we have prepared Co doped In2O3 nanoparticles using co-precipitation method. The prepared nanoparticles were characterized by the X-ray diffraction, scanning electron microscopy and dc magnetization hysteresis loop measurements. From the X-ray diffraction analysis it observed that all sample exhibits single phase polycrystalline nature. All the diffraction lines correspond to the bixbyite cubic structure. The full width half maximum (FWHM) calculated from XRD pattern has been found to decrease with increase in the Co contents, indicating that particle size decreases with increase in the Co concentration. FE–SEM micrograph reflects the nanocrystalline behavior of all the samples and shows that doping of Co ions hinders growth of the particles. DC magnetization measurements reveal that Co -DOPED In2O3 samples exhibits room temperature ferromagnetism.

STUDY ON PHOTOLUMINESCENCE PROPERTIES OF Co-DOPED ZnO

2014 ◽  
Vol 28 (09) ◽  
pp. 1450033 ◽  
Author(s):  
SHUXIA GUO ◽  
JIWU LI ◽  
ZULIANG DU
Keyword(s):  
Blue Emission ◽  
Green Emission ◽  
Blue Shift ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Charge Transfer Transitions ◽  
Doped Zno ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Co Doped

ZnO and Co -doped ZnO have been synthesized by co-precipitation technique. X-ray diffraction (XRD) patterns and absorption spectra show that Co ions are doped into the lattice positions of ZnO . Photoluminescence (PL) experiments on the samples have been performed in order to study the sp–d interaction in ZnO : Co . Room temperature measurements show two additional emissions related to Co besides the ZnO exciton-related and trap emissions. The two emissions are attributed to the transitions from Co + to the excited Co 2+ state and from 2 E(G) to 4 A 2 (F) , respectively. The charge-transfer transitions related to Co 2+ exciting 3d intrashell luminescence at 1.78 eV has been observed. A blue-shift in the exciton-related emission, a red-shift in the blue emission and no shift in the green emission were revealed and interpreted by the sp–d interaction.

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