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

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.

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

Modern Electronic Materials ◽

10.3897/j.moem.4.4.35063 ◽

2018 ◽

Vol 4 (4) ◽

pp. 135-141 ◽

Cited By ~ 1

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.

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

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.17.101 ◽

2017 ◽

Vol 17 ◽

pp. 101-105 ◽

Cited By ~ 3

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.

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Bergenia ciliate–Mediated Mixed-Phase Synthesis and Characterization of Silver-Copper Oxide Nanocomposite for Environmental and Biological Applications

Materials ◽

10.3390/ma14206085 ◽

2021 ◽

Vol 14 (20) ◽

pp. 6085

Author(s):

Fazal Ur Rehman ◽

Rashid Mahmood ◽

Manel Ben Ali ◽

Amor Hedfi ◽

Mohammed Almalki ◽

...

Keyword(s):

Copper Oxide ◽

Radical Scavenging Activity ◽

Average Particle Size ◽

Radical Scavenging ◽

Diffusion Method ◽

Average Particle ◽

Light Spectrum ◽

Structural Morphology ◽

X Ray ◽

Silver Copper

Bergenia ciliate (B. ciliate) leaf extract was used as a reducing and stabilizing agent for the synthesis of silver-copper oxide nanocomposite (Ag-CuO NC). Scanning and transmission electron microscopies (SEM and TEM) were used to examine the structural morphology, and the average particle size was determined to be 47.65 nm. The phase confirmation and crystalline structure were examined through the X-ray diffraction (XRD) technique, where cubic and monoclinic geometries were assigned to Ag and CuO. The energy dispersive X-ray (EDX), Fourier transform infrared (FTIR) and ultra-violet and visible (UV-Visible) spectroscopies were operated to analyse the elemental composition, functional groups and light absorption phenomena of the Ag-CuO NC. Under the full light spectrum, the photodegradation of Rhodamine 6G was recorded, and 99.42 percent of the dye degraded in 80 min. The Agar well diffusion method was followed to perform antibacterial activity against selected pathogens, and the activity was found to increase with increasing concentration of Ag-CuO NC. The ABTS free radical scavenging activity suggests that the activity of Ag-CuO NC is higher than ascorbic acid.

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Investigation of structural and optical properties of biosynthesized Zincite (ZnO) nanoparticles (NPs) via an aqueous extract of Rosmarinus officinalis (rosemary) leaves

MRS Advances ◽

10.1557/adv.2020.220 ◽

2020 ◽

Vol 5 (45) ◽

pp. 2349-2358 ◽

Cited By ~ 2

Author(s):

S. K. Noukelag ◽

H.E.A. Mohamed ◽

B. Moussa ◽

L.C. Razanamahandry ◽

S.K.O. Ntwampe ◽

...

Keyword(s):

Aqueous Extract ◽

Surface Defects ◽

High Surface ◽

Average Particle Size ◽

Zinc Nitrate ◽

Attenuated Total Reflection ◽

Average Particle ◽

Nitrate Hexahydrate ◽

Zno Nps ◽

X Ray

AbstractBiosynthesized Zincite nanoparticles have been successfully demonstrated by a completely green process mediated aqueous extract of rosemary leaves acting as both reducing and stabilizing agents and zinc nitrate hexahydrate as the precursor. The synthesis was free of solvents and surfactants to adhere to green chemistry principles and the impartation of environmental benignity. To achieve our objective, structural and optical investigations of ZnO annealed at 500°C for 2hrs were carried-out using complementary techniques. High resolution transmission electron microscopy (HRTEM) revealed the self-assembled, highly agglomerated quasi-hexagonal shaped NPs and the average particle size was found to peak at 15.62 ± 0.22 nm. Selected area electron diffraction (SAED) and X-ray diffraction (XRD) exhibited several diffraction rings with clear diffraction spots confirming their polycrystallinity and the purity of ZnO NPs with a wurtzite structure. Furthermore, the energy dispersive X-ray spectroscopy (EDS) substantiated the presence of Zn and O in the sample and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) illustrated the Zn-O chemical bonds. From UV-Vis-NIR, the optical band gap was amounted to 3.2 eV and photoluminescence (PL) emission spectrum to 2.9eV with high surface defects and oxygen vacancies. Through these results, the use of rosemary leaves extract is hereby shown to be a cost-effective and environmentally friendly alternative to synthesize Zincite nanoparticles (ZnO NPs).

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Structural Analysis of Platinum Nanoparticles on Carbon Nanotube Surface as Electrocatalyst System

International Journal of Chemistry ◽

10.5539/ijc.v9n2p60 ◽

2017 ◽

Vol 9 (2) ◽

pp. 60 ◽

Cited By ~ 2

Author(s):

Sudirman Sudirman ◽

Indriyati Indriyati ◽

Wisnu Ari Adi ◽

Rike Yudianti ◽

Emil Budianto

Keyword(s):

Cell Volume ◽

Unit Cell Volume ◽

Average Particle Size ◽

Unit Cell ◽

Lattice Parameters ◽

Atomic Density ◽

Average Particle ◽

X Ray Diffraction ◽

Great Opportunity ◽

X Ray

Synthesis of Pt/CNT composite by using sol gel method has been performed which the composition of CNT on the composite are vary, (x = 20, 40, 60 and 80 wt%). Performance of composite was characterized by Transmission Electron Microscope (TEM) and X-Ray Diffraction (XRD), respectively. In the refinement results of X-ray diffraction pattern, the composite consists of two phases, namely, carbon and platinum phases. Carbon phase has a structure hexagonal (P 63 m c) with lattice parameters a = b = 2.451(2) Å and c = 6.89(1) Å, α = β = 90° and γ = 120°, the unit cell volume of V = 35.8(1) A3, and the atomic density of ρ = 2.224 g.cm-3. While platinum phase has the structure of cubic (F m -3 m) with lattice parameters a = b = c = 3.921(2) Å, α = β = γ = 90°, the unit cell volume of V = 60.3(1) A3, and the atomic density of ρ = 21.487 g.cm-3.According to the image of TEM, the average particle size for Pt nano particle is estimated to range from 4.1-4.3 nm. While the cavity diameter average of CNT is estimated to range from 5.9-7.5 nm. Based on the calculation, the crystallite size of the Pt particle was around 4.31 nm. The optimum value of dispersed Pt into CNT occurred at 60 wt% CNT with the best composition of Pt in the unit cell of cystal structure. We concluded that this study successfully dispersed Pt nanoparticles onto CNT formed Pt/CNT composite. This was a great opportunity that the composite can be applied as electrocatalyst system on fuel cell application.

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Synthesis and Characterization of ZnO Nanoparticles and Its Application to Dye Sensitized Solar Cell

Advanced Science Letters ◽

10.1166/asl.2018.12162 ◽

2018 ◽

Vol 24 (8) ◽

pp. 5618-5623

Author(s):

Lakkanna S Chougala ◽

Mahantesh S Yatnatti ◽

Ravi K Linganagoudar ◽

Jagadish S Kadadevarmath

Keyword(s):

Zno Nanoparticles ◽

Average Particle Size ◽

Hexagonal Wurtzite Structure ◽

Average Particle ◽

Stoichiometric Ratio ◽

Solar Simulator ◽

Photovoltaic Properties ◽

X Ray ◽

Direct Band ◽

Load Variable

In this paper, we have reported the synthesis of zinc oxide (ZnO) nanoparticles by aqueous route method and its characterization. By X-ray diffraction pattern (XRD) study it reveals that ZnO has hexagonal wurtzite structure with average particle size of 16.5 nm. From the results of scanning electron microscope (SEM) and Atomic force microscope (AFM) images, particles were spherical in nature with good aggregation. Stoichiometric ratio of Zinc and oxygen were almost close which was revealed from energy dispersive analysis of X-ray (EDAX). From infrared spectroscopy (FTIR), peak of Zn–O bond appears at 433.43 cm−1. Direct band gap of ZnO was found to be 3.36 eV estimated from UV-Vis absorption spectra. The Photovoltaic properties of DSSC sensitized by Di-tetrabutylammonium cis-bis (isothiocyanato) bis (2,2′ -bipyridyl-4,4′-dicarboxylato) ruthenium(II) (N-719 dye) were obtained in which photo anode is prepared by synthesized ZnO. Photocurrent (I) and photovoltage (V) was measured using designed automated load variable solar simulator and optimum solar energy to electricity conversion efficiency (η) of 2.35% under AM 1.5 irradiation (1000 W/m2) was observed.

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Advancement in Microstructural, Optical, and Mechanical Properties of PVA (Mowiol 10-98) Doped by ZnO Nanoparticles

Physics Research International ◽

10.1155/2014/742378 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 26

Author(s):

N. B. Rithin Kumar ◽

Vincent Crasta ◽

B. M. Praveen

Keyword(s):

Mechanical Properties ◽

Zinc Oxide ◽

Zno Nanoparticles ◽

Main Chain ◽

Average Particle Size ◽

Testing Machine ◽

Average Particle ◽

Zno Nanoparticle ◽

X Ray ◽

Xrd Studies

The current paper explores the preparation of PVA nanocomposites by doping with zinc oxide (ZnO) nanoparticles using the method of coagulation and solvent casting technique. The dopant zinc oxide nanoparticle is prepared by simple precipitation method and is confirmed by the X-ray diffraction (XRD) studies. The XRD studies explore that the average particle size of the synthesized nanoparticles is 55 nm and show that the crystallinity factor of PVA nanocomposites is influenced by the interaction occurring between the PVA main chain and the ZnO nanoparticle. The FTIR spectroscopy suggests that the formulation of complexes occurring between the dopants and the PVA main chain is due to inter or intra molecular hydrogen bonding. UV-vis spectra explore the dramatic decrease in the optical energy gap of nanoparticles doped polymer composites and the variations of Urbach energy (Eu) related to crystallinity for various dopant concentrations. The mechanical properties of the PVA nanocomposites were explored using universal testing machine (UTM) that reflects that, for x=15% doping concentration, there is an increase in the tensile strength, stiffness, and Young’s modulus, whereas, for x=7.5% concentration, the percentage total elongation at fracture is found to be the maximum. The morphological behavior and homogenous nanoparticle distribution in the composites were examined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDAX).

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Nanocomposite of Polyaniline and ZnO: Preparation, Characterisation, Optical and Electrical Properties

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.24.123 ◽

2013 ◽

Vol 24 ◽

pp. 123-132 ◽

Cited By ~ 2

Author(s):

S.M. Giripunje ◽

Jyoti Ghushe

Keyword(s):

Zno Nanoparticles ◽

Average Particle Size ◽

Localization Length ◽

Red Shift ◽

Salt Transport ◽

Hydroxyl Groups ◽

Average Particle ◽

X Ray Diffraction ◽

X Ray ◽

Charge Localization

ZnO nanoparticles were prepared by chemical method using starch as capping agent. Also the polyaniline-zinc oxide (PANI-ZnO) nanocomposites were prepared by in-situ polymerization of aniline monomer with ZnO nanomaterials. The structure and morphology of the ZnO nanoparticles were investigated by X-ray diffraction and scanning electron microscopy. X-ray diffraction revealed the wurtzite structure of ZnO. Average particle size of the ZnO nanoparticles were also calculated from XRD. SEM micrographs showed the spherical shape of ZnO nanoparticles. Band gap energy of ZnO nanoparticles was determined from UV absorbance spectra and confirm quantum confinement. In UV-Vis spectra of PANI salt, two absorption peaks are observed at 320 and 630 nm. These absorption peaks arises due to excitation of the benzene segment including amine structures in polyaniline. A considerable large red shift at 360 nm from 320 nm has been observed for PANI-ZnO nanocomposites. This prominent red shift might occur due to the interaction between the hydroxyl groups of ZnO and the quinoid ring of emeraldine salt. Transport properties of PANI-ZnO nanocomposites were studied in terms of transport parameters such as DC electrical conductivity (σ), charge localization length (α-1), most probable hopping distance ® and hopping energy (w) using variable range hopping model as described by Ziller to conducting polymers.

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Effect of Ag Doping on Properties of Al–Doped ZnO Nanoparticles Varies as Zn1-X-YAgxALYO

Material Science Research India ◽

10.13005/msri/140210 ◽

2017 ◽

Vol 14 (2) ◽

pp. 146-152

Author(s):

Neha Sharma ◽

Sanjayay Kumar

Keyword(s):

Zno Nanoparticles ◽

Spherical Shape ◽

Xrd Analysis ◽

Crystalline Size ◽

X Ray Diffraction ◽

X Ray ◽

In Doping ◽

Vis Spectroscopy ◽

Doped Zno

In present study, undoped ZnO, Zn0.8Ag0.2O, Zn0.8Al0.2O and Zn0.6Al0.2Ag0.2O samples are synthesized by simple solution method. X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX) and UV-visible (UV-Vis) spectroscopy are used to perform the characterization of undoped, doped and codoped samples. XRD analysis is exposed that hexagonal wurtzite crystalline structure obtained for undoped, doped and codoped samples without any extra representation of impurity phases. The crystalline size is when evaluated by using Scherrer, It has 44, 49, 41and 37nm for undoped ZnO, Zn0.8Ag0.2O, Zn0.8Al0.2O and Zn0.6Al0.2Ag0.2O samples. Similarly, the crystalline size and strain are also evaluated by Williamson hall (W-H) and size strain plot (SSP) for the undoped, doped and codoped nanoparticles. The evaluated crystalline size by SSP is three times greater than the result of the scherrer method. The SEM exposes that surface morphology of nanoparticle samples, in this case is the formation of large agglomeration in spherical shape with nanocrystallites of undoped and doped ZnO with apparent and definite boundaries. EDX points out the replacement of Al2+ and Ag+ with Zn2+ in ZnO matrix and consequences in the development of single-phase Zn1−x−yAgxAlyO. The blueshift is shown in UV-Vis absorption spectra because the band gap value increases with the increase in doping, except Ag+ doped ZnO nanoparticles.

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

10.21203/rs.3.rs-237092/v1 ◽

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.

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