The scanning electron microscopy image of manganesedoped zinc oxide mzo thin films annealed at 300. The crystal structure of n doped zno nras was further investigated by raman scattering spectra, as illustrated in fig. Characterization of manganese doped zno mzo thin films by. Challenges in determining the location of dopants, to. Synthesis, characterization and ammonia sensing properties of. Zno spintronics and nanowire devices university of florida. Nanostructures of manganese doped zno have been studied by scanning electron microscopysem and transmission electron microscopytem. Zno, which increases the surface roughness of the thin films. Doped zno nanorods could be synthesized either by ex situ or in situ approach. To meet the demands of these applications, zno has to be doped with impurities such as ga, sb, al, p, mn, in a controllable way. For mn doped zno nanoparticles the optical band gap varies between 3. Pure and mndoped znse nanobelts were synthesized by a convenient thermal evaporation method. 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.
This combined experimental and theoretical study allows several structures to be identified. Magnetic and optical properties of manganese doped zno. Results from structural investigation and magnetic properties of mndoped zno are discussed. Pure and mn doped znse nanobelts were synthesized by a convenient thermal evaporation method. In this project, coprecipitation method was used to synthesize mn doped zno nanoparticles. Upon annealing to 800 c, the implanted mn remains in the zno nanobelts and the matrix recovers both in structure and luminescence.
However, we limit this report to the manganese doped system. The journal of physical chemistry c 2008, 112 30, 1114411149. In films doped with mn during pulsed laser deposition pld, we find an inverse correlation between magnetization and electron density as controlled by sn. However, certain perovskite structured oxides are electronically conductive finding application in the cathode of solid oxide fuel cells and oxygen. Up to now, however, it has been still limited to fabricate an array system of doped zno nanostructure although there have been reports about disarrays of sdoped zno nanowires geng et al. Zinc oxide is an inorganic compound with the formula zn o. Recently, doped onedimension 1d semiconductor nanostructures are especially attractive for their excellent and unique optical and optoelectronic properties 1,2, which were affected greatly by optical microcavity and dopant. A simple chemical coprecipitation method is used for the synthesis of mndpoed zno nanosized powder. However, we limit this report to the manganesedoped system. Room temperature ferromagnetism was found in mndoped zno. White light emission from surfaceoxidized manganese doped zns nanorods.
The typical thickness and widthtothickness ratios of the zno nanobelts are in the range of 10 to 30 nm and. Zinc acetate znc 2 h 3 o 2 2, manganese acetate mnch3coo2 2h2o and the. Optical transmission spectra of the tmdoped samples are shown at the top of fig. Wangnanowire and nanobelt arrays of zinc oxide from synthesis to properties and to novel devices. Synthesis and characterization of cudoped zno nanorods. 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. Wangb school of materials science, georgia institute of technology, 771 ferst drive, atlanta, georgia 303320245. The main purpose of this dissertation aims to develop new techniques to synthesize 1d zno. Mn nanoparticles, nanobelts and nanorods dhiraj kumar, sunil kumar a, h. Mn nanobelts are potentially useful for spintronics. Largescale fabrication and characterization of cddoped. Pdf a perspective of recent progress in zno diluted magnetic. Photovoltaic performance of zno nanosheets solar cell.
Mn doped zinc oxide nanobelts have been synthesized by chemical precipitation technique using zinc acetate, manganese acetate and absolute ethanol as starting materials. Zno either by narrowing the bandgap or by introducing energy levels in the bandgap of semiconductor materials. Aug 11, 2015 the crystal structure of n doped zno nras was further investigated by raman scattering spectra, as illustrated in fig. Largescale fabrication and characterization of cddoped zno.
This cited by count includes citations to the following articles in scholar. Results from structural investigation and magnetic properties of mn doped zno are discussed. The latter result is consistent with theory in that overdoping increases the antiferromagnetic direct coupling between the mn ions. Synthesis and characterization of single phase mn doped zno. From the optical studies, the transmittance in uv region was decreased with the increase of mn concentration. Schwen, manganesedoped zno nanobelts for spintronics, appl. Organometallic synthesis and spectroscopic characterization. Wangb school of materials science, georgia institute of technology, 771. Synthesis and characterization of mndoped zno nanoparticles.
The manganese mn dopant in the form of anhydrous manganese acetate was used to obtain mndoped zno films. The pxrd of all the doped samples verified presence of the ceo. The xrd patterns of pure and doped znse nanobelts are shown in figure 1. Zno hydrothermal ht growth was made on a previously zno seed layer, formed by solgel method. Influence of mn doping on the magnetic and optical properties of. Crystallography, impurities and magnetic properties of mn. The manganese mn dopant in the form of anhydrous manganese acetate was used to obtain mn doped zno films. Challenges in determining the location of dopants, to study. N doping to zno nanorods for photoelectrochemical water.
The photoanode of dyesensitized solar cell dssc was fabricated using twodimensional zno nanosheets 2d zno nss sensitized with betasubstituted porphyrins photosensitizer, and its photovoltaic performance in solidstate dssc with tio 2 nanotubes tio 2 tns modified poly ethylene oxide peo polymer electrolyte was studied. A simple chemical coprecipitation method is used for the synthesis of zno nanosized powder and its nanocomposite. Undoped and mndoped zinc oxide nanocrystals have been synthesized in aqueous solutions by using zinc acetate zn ch 3 coo 2. Zno is a white powder that is insoluble in water, and it is widely used as an additive in numerous materials and products including rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, and firstaid tapes.
In particular, zno is one of the most widely studied photocatalysts. Magnetic properties of doped ceo2 nanoparticles and ceo2. In this work zno and mndoped zno nanocrystals were synthesized by onestep aqueous solution method. We report on the structural, electronic, and magnetic properties of manganese. Positron lifetimes inside a material 100400 ps can be measured from pal spectroscopy. Raman spectroscopy is one of the most suitable techniques to assess the distribution of. Synthesis and spectroscopic characterization of manganese. Based on the mndoped chalcopyrites cdgeas2, zngeas2 and znsias2, new dilute magnetic semiconductors with the ptype conductivity were produced. Vi semiconductor nanocrystals doped with transition metals has proved to be particularly difficult. Aluminum doped zinc oxide azo is a highly insoluble thermally stable aluminum source suitable for glass, optic and ceramic applications.
Western michigan university, 2005 zinc sulphide quantum dots were synthesized in aqueous media using sodium polyphosphate asthe stabilizer. University of pune, ganeshkhind, pune, india1 assistant professor, department of physics, college of engineering, pune, india2 abstract. Pdf influence of mn doping on the magnetic and optical properties. Studies on various mn doped semiconductor nanocrystals4 have revealed that the properties of these samples, like the band gap, are influenced by the quantum confinement of electronic states 5.
Mndoped zno nanonails and their magnetic properties. In the case of cdse quantum dots qds produced via hightemperature pyrolysis in trioctylphosphine oxide topo, specially designed precursors used in this study appear to be necessary to successfully incorporate low levels of mn. Magnetic properties of doped ceo2 nanoparticles and ceo2fe o. Optical transmission spectra of the tm doped samples are shown at the top of fig. Synthesis and characterization of manganese doped zno. Their temperature dependences of magnetization are similar in form in spite of a complicated character, which is controlled by the concentration and mobility of. In the case of the zno nanoribbons, the sulfur atoms or thiol groups were attached in different ways to the zinc or oxygen atoms located at the edges, whereas in clusters, the sulfur atoms were set on the surface, mainly interacting with atoms with lowcoordinate number. Room temperature ferromagnetism was found in mn doped zno. Magnetization, electrical resistivity and hall effect of these compositions were studied. All of the xrd pattern peaks of pure and doped znse nanobelts are in agreement with the standard values jcpds card no. Zinc oxide zno is an important semiconducting material, having a broad range of applications including lightemitting devices, spintronics, transparent conductive oxides, and ultraviolet uv light blockers.
The magnetization, electrical resistivity, magnetoresistance, and the hall effect of these compositions are studied. A new spintronics material with the curie temperature above room temperature, the znsias2 chalcopyrite doped with 1 and 2 wt % mn, is synthesized. Dms can lead to the stateofart spintronic devices that use both spin and charge of electrons 5. Enhanced ferromagnetism in zno nanoribbons and clusters. Zinc oxide zno nanobelts synthesized by thermal evaporation have been ion implanted with 30. Sem images showed that annealing temperature has a vital function in controlling surface morphology. Based on the mn doped chalcopyrites cdgeas2, zngeas2 and znsias2, new dilute magnetic semiconductors with the ptype conductivity were produced. Nano express open access the effect of dopant and optical microcavity on the photoluminescence of mndoped znse nanobelts weichang zhou1, ruibin liu2, dongsheng tang1 and bingsuo zou2 abstract pure and mndoped znse nanobelts were synthesized by a convenient thermal evaporation method. Pdf the structural, optical and magnetic properties of mn doped zno. But there is hardly any experimental study to analyze the role of defect state not only in tm doped zno samples but also for any other dms materials. On the other hand, the effects of concentration of mn dopant ions on the particle size, shape and optical properties of mndoped zno nanoparticles were investigated through scanning electron.
Manganesedoped zno nanobelts for spintronics zhong lin wang. Mg doped zno dilute magnetic oxides prepared by chemical method. Characterization of manganese doped zno mzo thin films by spin coating technique 1. 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. Scanning electron microscopy, xray powder diffraction, energy dispersive xray spectroscopy and corresponding element mapping, and transmission electron microscope were used to examine the morphology, phase structure, crystallinity, composition, and growth direction of asprepared nanobelts. Mg doped zno dilute magnetic oxides prepared by chemical. Manganese doped zno nanobelts for spintronics by c. Effect on the structural, optical and electrical properties of mndoped zno nanobelts synthesized via. Nano express open access the effect of dopant and optical. Mn doped zno nanocrystals were synthesized using wet chemical synthesis technique. Synthesis, characterization and ammonia sensing properties. The structural properties showed that the undoped and mn doped zno nanoparticles exhibit hexagonal wurtzite structure. The ones marked may be different from the article in the profile.
It is found that mn doped zno thin films exhibit ferromagnetism at room temperature 3. The xrd analysis showed that the produced zn1xmnxo 0. The temperature dependence of the electrical resistivity follows a semiconducting pattern with an activation energy of 0. Synthesis, characterization and properties of mndoped zno. The effect of dopant and optical microcavity on the. Abstract this paper reports the synthesis, characterization and properties of nanosized mndoped zno. Characterization of manganese doped zno mzo thin films.
V nanowires based on metal nanoclustercatalyzed chemical vapor deposition has been developed. Raman study of dopedzno thin films grown by rf sputtering. Sn may simply provide carriers, albeit electrons, that effectively mediate the spin interactions. This paper reports the synthesis, characterization and ammonia sensing properties of nanosized zinc oxide zno and its nano composite mn doped zno. Mn, ni, fe, co and cr into zno due to the potential applications in spintronics 17. A general approach for the synthesis of manganesedoped ii. Apr 25, 2015 characterization of manganese doped zno mzo thin films by spin coating technique 1. The synthesis procedure also enables the incorporation of different transition metals into the zno matrix, such as co and cu.
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