Cd and cu codoped zno nanoparticles were synthesized by polyol method and subsequently have been characterized by their structure, optical and photoluminescence studies. All diffractions match with the hexagonal wurtzite phase of zno pdf 36. Structure and properties of codoped zno films prepared by. Synthesis and characterization of mndoped zno nanoparticles. Mg doped zno have considerable interests owing to their unique optical, thermal and structural properties. A simple chemical coprecipitation method is used for the synthesis of mndpoed zno nanosized powder. However, inour case, the peak shift inthe xrdpattern for the doped zno nanorods is. Mn systems, doping of zno with cr might be attractive as according to theoretical predictions crdoping may result in a ferromagnetic. Here, we report the synthesis of leadfree singlecrystalline twodimensional 2d vanadiumv doped zno nanosheets nss and their application for highperformance flexible direct current dc power piezoelectric nanogenerators ngs. Synthesis and characterization of zno nanoparticles submitted by jayanta kumar behera in partial fulfillment for the award of the degree of master of science in physics. Synthesis, structural, optical properties and antibacterial. Fabrication of doped zno, have become interesting and crucial.
Oct 18, 20 from the magnetization measurements, it is noticed that the codoped zno nanostructures exhibit considerably robust ferromagnetism i. For the codoped material a strong optical band at 0. From zeta potential measurements the zeta potential was found. This study investigating the effect of a high magnetic field on the oxidation of co doped zno films revealed that a high magnetic field is an effective tool to modify the structure, optical, electrical, and magnetic properties of co doped zno films without any contact. Piezoresponse force microscopy studies reveal that vertical v doped zno ns. Structural, optical and magnetic properties have been investigated as a function of dopant concentration. Physical and magnetic properties of co, ag doped zno. On the other hand, the effects of concentration of mn dopant ions on the particle size, shape and optical properties of mn doped zno nanoparticles were investigated through scanning electron. Analysis of oxygen vacancy in codoped zno using the electron. Fabrication and analysis of crdoped zno nanoparticles from. The synthesis process is based on the hydrolysis of zinc acetate dihydrate and cobalt acetate tetrahydrate heated under reflux to 65 c using methanol as a solvent. In order to investigate the magnetic properties of these diluted magnetic semiconductors, co doped zinc oxide nanoparticles and thin. Zno and cobalt doped zno nanoparticles were synthesized by using simple solution route, which is robust and reliable to control the shape and size of particles without requiring the expensive and complex equipments. Synthesis and characterization of cudoped zno nanorods.
Structural, optical and magnetic properties of codoped. Pdf structure and magnetism of cobaltdoped zno thin films. Raman study of dopedzno thin films grown by rf sputtering. Shapecontrolled synthesis of nanostructured codoped zno thin. Pdf surface, optical and photocatalytic properties of rb. Preparation of co and ni doped zno nanoparticles served as. Figure 3 presents the room temperature pl spectra of co and n co doped zno nanopowders. The structural and magnetic properties were correlated to understand the origin of room tempe rature ferromagnetism in our samples.
The effects of al and n doping on the structural and optical properties of the films were extensively investigated. Structure and ferromagnetic properties of codoped zno powders article in journal of magnetism and magnetic materials 32114. The patterns were compatible with standart results pdf card no. Aug 11, 2015 solutionbased zno nanorod arrays nras were modified with controlled n doping by an advanced ion implantation method and were subsequently utilized as photoanodes for photoelectrochemical pec. Effect of al and n doping on structural and optical.
We have doped the ni and cu in the zno both with 3% by weight. Synthesis and characterization of manganese doped zno. Synthesis of codoped zno nanoparticles via co precipitation. Pure, al doped, and co, al co doped zno nanopowders were synthesized through chemical co precipitation method at room temperature, using poly ethylene glycol peg as stabilizing agent.
May 01, 2014 cudoped zno nanorods have been grown at 90c for 90 min onto a quartz substrate precoated with a zno seed layer using a hydrothermal method. Surfactant assisted synthesis of co and li doped zno. By combining synchrotron xray and neutron scattering, we investigated the detailed structure of deuterium contained zn0. Synthesis and characterization of co doped zno nanoparticles.
The crystal structural and magnetic properties were studied by means of xrd and vsm, respectively. Electrical transport and optical studies of ferromagnetic cobalt. Structure and ferromagnetic properties of codoped zno. Journal of chemical and pharmaceutical research, 2012, 44. Colloidal cobaltdoped zno nanoparticles by microwave. Ngo ndimba, pablo diazchao, mikael motelicaheino, p. Experimental results often depend on synthesis methods. Cobaltdoped zno powders with various dopant concentrations were synthesized using a simplesolid method. These co, ag codoped zno nanopowders can be used in the fabrication of spintronic and optoelectronic device applications. The main propose of this paper was concentrated on the preparation of al and n doped zno anzo thin films by solgel spin coating technique.
Raynal, cecile autret, fabian delorme to cite this version. First we have weighting the starting material according to their molarities in the solution. Deepak chemistry and physics of materials unit and csir centre of excellence in chemistry, jawaharlal nehru centre for advanced scientific research, jakkur po. Undoped and cu doped zno films of two different molarities deposited by spray pyrolysis using zinc nitrate and cupric chloride as precursors show polycrystalline nature and hexagonal wurtzite structure of zno. Zno either by narrowing the bandgap or by introducing energy levels in the bandgap of semiconductor materials. Zno and mg doped zno nanoparticles with different doping concentration were prepared by precipitation method.
Here they assumed li codoping creates ptype carriers in zno. Co doped zno is a good candidate roomtemperature magnetic semiconductor and has been intensively studied in terms of intrinsic ferromagnetism. Effect of cobalt doping on physical properties of zno nanopar. Structure, optical properties and synthesis of codoped zno. Synthesis of al doped zno nanoparticles by aqueous. Apr 18, 2015 in this study, we applied such analysis to v o that changed as a function of the co doping concentration in zno. Pdf synthesis and characterization of co doped zno. Uvvisible diffuse reflectance spectroscopy uvvisdrs, xray diffraction xrd, scanning electron.
A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The influence of copper cu precursor and concentration on the structural, morphological, and. Doping increases the transmittance of the films whereas the optical band gap of zno is reduced from 3. Zno and co 3 o 4 powders were employed as the precursors. For instance, by doping impurities such as mn, cr and co, zno with wavelength could be tuned to visible light region was produced pearton et al. So we have used zinc chloride 97% and 3% nickel sulphate and copper chloride. Oxygen vacancies and zinc interstitials were found to be the main reasons for roomtemperature ferromagnetism in the codoped zno nps with the support of the results obtained from. Al doped zno thin films were deposited on caxis sapphire substrates by sequential pulsed laser deposition technique wherein sintered zno and al 2o 3 pellets were ablated sequentially many number of times to obtain films of desired thickness. The bet shows that the surface area of synthesized catalyst increases when the weight ratio of manganese increases up to 1% mn, but decreases thereafter. Moreover, the magnetic properties of co doped zno samples electrodeposited as a function of field and temperature exhibit clearly ferromagnetism with curie temperature above 400 k. Among the various methods, the chemical co precipitation is the best low cost method used for the preparation of large quantity of. Cd, and fe in order to improve its physical properties optical and electrical properties. The present work is devoted to tailoring nanostructured codoped zno films and. Optical and electrical properties of highly doped zno.
The vertically aligned zno nanorods nrs converted to ns networks by v doping. We report on the hightemperature ferromagnetism in co doped zno films fabricated by the solgel method above 350 k. Some studies reveal that the magnetic behavior of cr doped zno appears to be very sensitive to the deposition method. Effect of cobalt doping on structural, optical, and magnetic.
It is now generally accepted that for low carrier density systems. Charge carrier and spin doping in zno thin films d. Structural, optical and magnetic properties of fe doped zno. Synthesis and structural, electrical, optical properties. Synthesis and characterization of ni and cu doped zno.
Synthesis and characterization of zno nanoparticles submitted by jayanta kumar behera in partial fulfillment for the award of the degree of master of science in physics under the esteemed guidance of dr. Synthesis, characterization and properties of mndoped zno. Zno nanocomposite material was achieved using a simple chemical coprecipitation method, in which 0. Synthesis of silverdoped zinc oxide nanocomposite by pulse. The magnetic properties of zno co doped with mn and sn are also discussed. According to vegards law, this peak shift is expected for a co doped zno sample. Synthesis of al doped zno nanoparticles by aqueous coprecipitation fabien giovannelli, p. Zno thin films co doped with mn and co have been deposited on glass substrates by spin coating technique. The concentrations of al in the films were varied by varying the ablation pulse ratio of al 2o 3. It could be attributed to the acceptorbound exciton a0x in view of the exclusively positive hall coef. Zno doped with transition metal ions university of florida. Codoped zno nanoparticles were synthesized by a simple chemical method at low temperature with co. Structural, optical, and magnetic characterization of co and.
The very strong 002 peaks confirmed that the caxis was the growth direction for the nanorods films, indicating a single crystalline 1d structure. The effect of mg doping on the crystal structure, morphology and optical properties of the nanoparticles was also investigated. Abstract this paper reports the synthesis, characterization and properties of nanosized mndoped zno. Xrd and psa results revealed the formation of cd and cu codoped zno nanoparticles with an average crystallite size of 50 nm and average particle size of 246 nm. Pdf visible light assisted photocatalytic activity of co. Dillip kumar bisoyi department of physics national institute of technology, rourkela769008, orissa, india. N doping to zno nanorods for photoelectrochemical water. Cobaltdoped zno powders by a simple solidstate method. Pdf the structure and magnetic properties of codoped zno films are discussed in relation to cobalt doping levels and growth conditions. For pure zno, the o 1s spectrum could be split into three peaks centered at 532. Pdf magnetic and structural properties of co doped zno.
Structural, optical and magnetic properties author links open overlay panel s. Twodimensional vanadiumdoped zno nanosheetbased flexible. Nickel ni and cobalt co doped zno nanoparticles were prepared using simple and costeffective solgel technique. Absence of ferromagnetism in mn and co doped zno c. Effect of cobalt doping on physical properties of zno nanoparticles. Pdf the present work describes the synthesis of pure and rb doped zno zno. Three structures of zno are stable wurtzite wz, rock salt and zinc blend at. However, the reported experimental results on the studies of cr doped zno have been very conflicting.
Zinc acetate znc 2 h 3 o 2 2, manganese acetate mnch3coo2 2h2o and the. Structural and photoluminescence properties of cd and cu. Doped zno nanorods could be synthesized either by ex situ or in situ approach. Aln codoped zno films by solgel method are still very limited. We have shown earlier that codoped zno nanoparticles exhibited rtfm by. In the given coordinatesthenonparabolicityparametercc.
In this project, co precipitation method was used to synthesize mn doped zno nanoparticles. Pdf synthesis and characterization of al doped and co. Synthesis of codoped zno nanoparticles via coprecipitation. Considering the different technological applications of zno, this compound has been doped by different elements e. Synthesis and characteristics of mg doped zno thin films. A strong uv emission at 387, 390, and 395 nm observed for 4, 6, and 8 % co and n co doped zno nanopowders, respectively, indicates decrease in band gap with increase in doping. Zinc oxide zno, cobalt co, indium in individually doped and co doped coin zno nanoparticles were synthesized by the co precipitation method. Zno doped with transition metal ions 1041 where n mn is the concentration of uncompensated mn spins. Semiconductor materials with dilute doping of transition metals are of great interest in spintronic applications. Synthesis and characterization of zno nanoparticles. The pure and codoped zno nps showed significant changes in the mh loop where the diamagnetic behavior of zno changes to ferromagnetic nature when doping with co.
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