scholarly journals Photocatalytic and Photoluminescence Studies of La, Ce and Dy Co-Doped ZnO Nanoflowers

2021 ◽  
Author(s):  
Syed Irtiqa ◽  
Atikur Rahman
Keyword(s):  
Zno Nanoparticles ◽  
Photocatalytic Performance ◽  
Average Particle Size ◽  
Visible Region ◽  
Solar Spectrum ◽  
Grain Morphology ◽  
Average Particle ◽  
Trap States ◽  
Doped Zno ◽  
Co Doped

Abstract In the present work, ZnO nanoparticles were doped with varying concentration of Lanthanum (La), Cerium (Ce) and Dysprosium (Dy) using a simple and cost effective co-precipitation approach at low temperatures. The resulting powders were calcined at 500 °C for 1 hour using a muffle furnace, to produce La, Ce, Dy co-doped ZnO nanoparticles with varying stoichiometry viz. Zn0.97La0.01Ce0.01Dy0.01O, Zn0.94La0.02Ce0.02Dy0.02O, Zn0.91La0.03Ce0.03Dy0.03O, Zn0.88La0.04Ce0.04 Dy0.04O and Zn0.85La0.05Ce0.05Dy0.05O. This is a simple approach for doping and doesn’t require and complex equipment, harmful chemical or sophisticated machinery. The synthesized powders were characterized using X-Ray diffraction (XRD) and Scanning electron microscopy (SEM) for studying the structure, purity, and grain morphology. The average particle size was calculated using XRD and was found to be 35 nm, it also indicated a hexagonal wurtizite structure with no secondary peaks. A change in morphology from nanorods to nanoflowers was observed as the concentration of dopants increased. Photoluminescence (PL) spectra indicated a red shift in the absorption edge towards the visible region of solar spectrum and this was further confirmed by Diffuse Reflectance Spectra (DRS). The photocatalytic properties of undoped and La, Ce, Dy co-doped ZnO nanoparticles were observed by examining the photodegradation of Rhodamine B dye under UV irradiation. Elimination of dye color indicated the total degradation of organic molecule. The results revealed that ZnO photocatalyst with La, Ce, Dy co-doping concentration Zn0.85La0.05Ce0.05Dy0.05O exhibited the best photocatalytic performance (95%) as compared to undoped ZnO. The improved photocatalytic performance can be attributed to the increased surface oxygen vacancies and adsorption capacity. Delay in recombination of charge carriers due to creation trap states in the bandgap of ZnO further improves the photocatalytic performance of doped samples.

scholarly journals Photoluminescences properties of lanthanum-silver co-doped ZnO nano particles

2018 ◽  
Vol 4 (4) ◽  
pp. 135-141 ◽  
Author(s):  
V. Porkalai ◽  
B. Sathya ◽  
D. Benny Anburaj ◽  
G Nedunchezhian ◽  
S. Joshua Gnanamuthu ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Zinc Acetate Dihydrate ◽  
Average Particle Size ◽  
Semiconductor Nanoparticles ◽  
Nano Particles ◽  
Average Particle ◽  
Rare Earth Ion ◽  
X Ray ◽  
Doped Zno ◽  
Co Doped

Recently, transition metal (TM) and rare earth ion doped II–VI semiconductor nanoparticles have received much attention because such doping can modify and improve optical properties of II–VI semiconductor nanoparticles by large amount. In this study, undoped, La doped and La+Ag co-doped ZnO nano particles have been successfully synthesized by sol-gel method using the mixture of Zinc acetate dihydrate and ethanol solution. The powders were calcinated at 600 °C for 2 h. The effect of lanthanum and lanthanum-silver incorporation on the structure, morphology, optical and electrical conductivity were examined by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-ray Absorption (EDAX), Fourier transform infrared spectroscopy (FTIR), UV and Photo Luminescence (PL) Characterization. The average particle size of the synthesized ZnO nanoparticles is calculated using the Scherrer formula and is found to be of less than 20 nm. Luminescences properties were found to be enhanced for the La and La+Ag co-doped ZnO nanoparticles.

scholarly journals Potfrigator Technology : Preservatives Equipment Low Energy For Fish and Reducing Hazardous Heavy Metals Based Photocatalytic Co Doped ZnO and Cooling Dynamic System

KnE Energy ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 16
Author(s):  
Alfin Darari ◽  
Mukholit . ◽  
Arif Sony Wibowo
Keyword(s):  
Heavy Metals ◽  
Zno Nanoparticles ◽  
Cooling System ◽  
Average Particle Size ◽  
Homogeneous Solution ◽  
The Body ◽  
Average Particle ◽  
Body Tissues ◽  
Doped Zno ◽  
Co Doped

<p>Pollution is caused by dangerous heavy metal such as Pb, Cu and Zn are toxic in the body tissues of organisms such as fish in high concentrations, it will be harmful to human health The purpose is to create an eco-friendly fish preservative tool with cooling system of thermodynamics and photocatalytic Co doped ZnO nanoparticles. this device can reach temperature 15 oC. Then to reduce dangerous heavy metals and kill bacteria used principle of photocatalytic Co doped ZnO nanoparticles. Co doped ZnO synthesized by sol-gel method. Then proceeded to spray coating and drying with furnace. The result is a purple clear homogeneous solution. From the analysis of the obtained bandgap Co doped ZnO about 2.28 eV and from SEM generated that average particle size Co doped ZnO is 60 nm. From the result of Co doped ZnO can be initiated by visible light and may have antibacterial activity so that this material can be made as a tool to prevent the growth of microorganisms only using regular light </p><p><strong>Key words</strong> : Eco-friendly fish preservative tools; less energy based on cooling dynamic; Nano Co Doped ZnO. <br /><br /></p>

Structural and Morphological Properties of Ag and In Co-Doped ZnO Nanoparticles Synthesized by Sol-Gel Method

2017 ◽  
Vol 17 ◽  
pp. 101-105 ◽  
Author(s):  
V. Porkalai ◽  
B. Sathya ◽  
Durairaj Benny Anburaj ◽  
G. Nedunchezhian ◽  
R. Meenambika
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Average Particle Size ◽  
Morphological Properties ◽  
Average Particle ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Doped Zno ◽  
Co Doped

Zinc oxide has been receiving an enormous attention due to its potential applications in a variety of field such as optoelectronics, spintronics and sensors. Ag and In co-doped ZnO nanoparticles with different doping concentration 0.1M, 0.2M and 0.3M were prepared by sol-gel method via microwave irradiation followed by calcinations at 600°C for 2h. The structure and morphology were examined by X-ray diffraction (XRD), and Scanning Electron Microscope (SEM), respectively. Elemental composition has been estimated by Energy Dispersive X-ray Absorption (EDAX), while chemical properties are studied by Fourier transform infrared spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) . The average particle size of the synthesized ZnO nanoparticles was calculated using the Scherrer formula and is found to be of less than 20 nm. Also the effect on the structure and the morphological properties of ZnO when co-doped with silver and Indium is examined. As the process is simple and low cost, it has the potential to be produced on a large scale.

scholarly journals Facile Microemulsion Synthesis of Vanadium-Doped ZnO Nanoparticles to Analyze the Compositional, Optical, and Electronic Properties

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 821 ◽  
Author(s):  
H.S. Ali ◽  
Ali Alghamdi ◽  
G. Murtaza ◽  
H.S. Arif ◽  
Wasim Naeem ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Average Particle Size ◽  
Xrd Analysis ◽  
Attenuated Total Reflection ◽  
Lattice Parameters ◽  
Average Particle ◽  
Structural Morphology ◽  
Wurtzite Phase ◽  
X Ray ◽  
Doped Zno

In this work, microemulsion method has been followed to synthesize vanadium-doped Zn1−xVxO (with x = 0.0, 0.02, 0.04, 0.06, 0.08, and 0.10) nanoparticles. The prepared samples are characterized by several techniques to investigate the structural, morphology, electronic, functional bonding, and optical properties. X-ray diffractometer (XRD) analysis confirms the wurtzite phase of the undoped and V-doped ZnO nanoparticles. Variation in the lattice parameters ensures the incorporation of vanadium in the lattice of ZnO. Scanning electron microscopy (SEM) shows that by increasing contents of V ions, the average particle size increases gradually. X-ray Absorption Near Edge Spectroscopy (XANES) at the V L3,2 edge, oxygen K-edge, and Zn L3,2 edge reveals the presence and effect of vanadium contents in the Zn host lattice. Furthermore, the existence of chemical bonding and functional groups are also asserted by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). UV–Visible analysis shows that by increasing V+ contents, a reduction up to 2.92 eV in the energy band gap is observed, which is probably due to an increase in the free electron concentration and change in the lattice parameters.

Co-Doped ZnO Nano-Agglomerates as a Potential Scaffold for Non-Enzymatic Hydrogen Peroxide Sensing

2021 ◽  
Vol 13 (9) ◽  
pp. 1732-1738
Author(s):  
Ahmad Umar ◽  
Ramesh Kumar ◽  
Rajesh Kumar ◽  
Ahmed A. Ibrahim ◽  
Mohsen A. M. Alhamami ◽  
...  
Keyword(s):  
Hexagonal Phase ◽  
Average Particle Size ◽  
Solution Process ◽  
Average Particle ◽  
Spherical Nanoparticles ◽  
Cyclic Voltammetric ◽  
Wurtzite Hexagonal Phase ◽  
Dynamic Concentration ◽  
Doped Zno ◽  
Co Doped

Co-doped ZnO nano-agglomerates were synthesized by a facile solution process. Several characterization techniques revealed the successful doping of the ZnO by Co ions. FESEM results showed the agglomeration of the Co-doped ZnO nanoparticles to form large-sized nano-agglomerates. The diameters of the spherical nanoparticles and the agglomerates were not found to be uniform. The diameters of the nano-agglomerates ranged from ~25 nm–120 nm. XRD spectrum confirmed the Wurtzite hexagonal phase of ZnO in Co-doped ZnO nanoagglomerates. The average particle size for Co-doped ZnO nano-agglomerates was 20.68 nm. The sensing parameters were examined by using Co-doped ZnO nano-agglomerates modified gold electrode through cyclic voltammetric and amperometric analysis. The sensitivity of 70.73 μAmM−1cm−2 and very low-detection limit of 0.2 μM was observed for H2O2. The corresponding linear dynamic concentration range was 0.2–1633 μM. The excellent sensing activities of the Co-doped ZnO nano-agglomerates for H2O2 were attributed to the improved intrinsic electric properties and increased inner defects density, particularly near the interface region.

STRUCTURAL AND MAGNETIC STUDY OF Co-DOPED ZnO NANOPARTICLES SYNTHESIZED BY AUTO COMBUSTION METHOD

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1025-1028 ◽  
Author(s):  
FAHEEM AHMED ◽  
SHALENDRA KUMAR ◽  
NISHAT ARSHI ◽  
M. S. ANWAR ◽  
BON HEUN KOO ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Room Temperature Ferromagnetism ◽  
Visible Region ◽  
Photo Luminescence ◽  
Combustion Method ◽  
Magnetic Studies ◽  
Transmission Electron ◽  
Auto Combustion ◽  
Doped Zno ◽  
Co Doped

In the present work, we have synthesized Zn 1-x Co x O (x = 0.0 ≤ x ≤ 0.1) nanoparticles by an auto-combustion method using C2H5NO2 (glycine) as a fuel. The prepared nanoparticles were characterized by using X-ray diffraction, transmission electron microscopy, Photo-luminescence (PL) and magnetization measurements. XRD and TEM results demonstrated that Co -doped ZnO have a single phase nature with wurtzite structure and Co2+ ions were successfully incorporated into the lattice position of Zn2+ ions in ZnO matrix. PL spectra show two emission bands in visible region. Magnetic studies showed that Co -doped ZnO nanoparticles exhibit room temperature ferromagnetism.

A facile one-pot synthesis of Er–Al co-doped ZnO nanoparticles with enhanced photocatalytic performance under visible light

2015 ◽  
Vol 143 ◽  
pp. 312-314 ◽  
Author(s):  
Xueying Zhang ◽  
Shanshan Dong ◽  
Xian Zhou ◽  
Lei Yan ◽  
Guojun Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Zno Nanoparticles ◽  
Photocatalytic Performance ◽  
One Pot ◽  
One Pot Synthesis ◽  
Doped Zno ◽  
Co Doped

SYNTHESIS, CHARACTERIZATION, AND OPTICAL PROPERTIES OF Y-DOPED ZnO NANOPARTICLES

NANO ◽  
2009 ◽  
Vol 04 (04) ◽  
pp. 225-232 ◽  
Author(s):  
TALAAT M. HAMMAD ◽  
JAMIL K. SALEM ◽  
ROGER G. HARRISON
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Zno Nanoparticles ◽  
Average Particle Size ◽  
Precipitation Method ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Doped Zno ◽  
Size And Morphology

Zinc oxide ( ZnO ) and yttrium-doped ZnO nanoparticles with particle size in the nanometer range have been successfully synthesized by the alkali precipitation method. The nanoparticle size and morphology have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The average particle size of Y-doped ZnO nanoparticles is about 17–29 nm. The absorption and photoluminescence (PL) spectra of the undoped and doped ZnO nanoparticles were also investigated. The optical band gap of ZnO nanoparticles can be tuned from 3.27 to 3.40 eV with increasing yittrium doping levels from 0 to 5%. The nanoparticles gave two emission peaks, one at around 376 nm and the other at 500 nm.

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