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. Synthesis and characterization of ni and cu doped zno. Observation of co detection using aluminumdoped zno. Structure and properties of codoped zno films prepared by.
Despite a number of reports available on nickel doped zno, still lot of controversies persists on the existence and origin of room temperature ferromagnetism in this system. Chapter 3 synthesis and characterization of mn doped zno systems prepared by solid state and solgel routes as we discussed in chapter 1, zno is the most promising material for spintronics and optoelectronic devices. Synthesis and characterization of copper doped zinc oxide. Optoelectronic properties of indium doped zinc oxide thin films s s shinde, p s shinde, c h bhosale et al. The combination of optical and semiconductor properties of doped zinc oxide make a contender for new generations of devices. For the growth of re alloyed zno, the pld target are sintered with a defined re concentration by intermixing zno powder with reoxide powder 1516. Characterization of electrical performance of aluminum. The p, q, and r samples were employed as the seed layer for the growth of the aligned zno nanorod. An experimental study of sndopedzno using solgel approach. The caxis of the zno nanowires perfectly matches the growing direction of the underlying film, resulting in good vertical alignment of nanowire arrays. The main limitations of co doped zno that need to be overcome to promote its use in practical applications is to increase its curie temperature above room temperature rt and find the origin of its magnetism. Upperlower panel experimental samples with thickness of about 30nm were prepared by rf magnetron sputtering on glass substrate.
The highest conductivity was obtained for the 2 % and 2. Synthesis and characterization of mndoped zno nanoparticles. Zinc oxide zno is a semiconductor with large excitation binding energy 60 mev, direct wide energy band gap 3. The work includes the study and gel approach under high temperature zno, sn doped, sol gel, deposition. An oscillating piezoresistive microcantilever mc coated with an aluminum aldoped zinc oxide zno nanorods was used to detect. Few works were conducted on magnetic properties of rareearth doped zno 911. 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. Nedunchezhian1 1 pg and research department of physics, thiru. N doping to zno nanorods for photoelectrochemical water. Changes in structural, electrical and electronic properties of zinc oxide zno due to al doping are studied using a quantumchemical approach based on the hartreefock theory. Table 3 shows that the loss in weight of pure zno and nio doped zno samples in the different ranges of temperature observed from tga. It is a transparent conductive oxide which could replace the more expensive indium tin oxide 47.
Structural and optical properties of pure and al doped zno. So we have used zinc chloride 97% and 3% nickel sulphate and copper chloride. Pandeysolutionprocessed undoped and indium doped zno thin film transistors. Structural, optical and antibacterial activity studies of.
Structural and optical properties of ndoped zno nanorod. Structural and optical properties of ndoped zno nanorod arrays boqian yang1, peterxian feng1,3, ashok kumar1, r s katiyar1 and marc achermann2 1 department of physics, university of puerto rico, rio piedras 00931, pr, usa 2 department of physics, university of massachusetts, amherst, ma 01003, usa email. Xray diffraction xrd analysis reveals that the cudoped zno crystallize in a wurtzite. Low temperature ferromagnetism and optical properties of. We have doped the ni and cu in the zno both with 3% by weight. In this work, we report the properties of cuzno rodstructures and a comparison of pure and cudoped zno single rod hydrogen. There are number of reports available in the literature on the optical and magnetic properties of transition metal doped zno 157, 158, but still, it is a good candidate for. Mgdoped zno have considerable interests owing to their unique optical, thermal and structural properties. In this project, coprecipitation method was used to synthesize mndoped zno nanoparticles. Zinc oxide zno is one of them, because it possessed a relatively large direct band gap 3.
Mar 15, 2015 aldoped zincoxide azo thin films were prepared by rf magnetron sputtering at different oxygen partial pressures and substrate temperatures. Al doped ntype zno, in particular, exibits high electrical conductivity and optical transparency in the visible region. It is easy to obtain good conductive ntype zno by monodoping iii group elements as donors. In this paper, the properties of pulsed deposited zno thin films on single crystalline inp have been investigated. The electrical conductivity for all doping levels improved compared to undoped zno.
The synthesized nanoparticles retained the wurtzite hexagonal structure. Inanycase,the lattice period a remains below its values for undoped bulk zno crystal, indicating the presence of compressivestressesin. Figure 4 shows the surface morphologies of the zno nanorod grown on sndoped zno thin film 0, 1, and 2. Zno substrate and a surface layer that was heavily doped with phosphorus 27. Structural and xray photoelectron spectroscopy study of. This blue shift is due to the filling of the conduction band of zno with the electrons donated by al donors11,12. Sn doping induced enhancement in the activity of zno.
Annealing effect on the structural and optical properties. First we have weighting the starting material according to their molarities in the solution. Improving the visiblelight absorption is one of the key ways to optimize the photoelectrochemical performance of zinc oxide zno nanowire arrays nws. Undoped and mgdoped zno can be synthesized by a simple spray pyrolysis technique. Under ultra violet light zinc oxide is photoconductive. Discussion includes the behavior of phosphorus as an acceptor and magnetism in transition metaldoped zno. The dopant concentration alzn in atomic percentage wt% was varied from 0 to 3 wt%. The crystal structure of n doped zno nras was further investigated by raman scattering spectra, as illustrated in fig. Abdelhaye 3 department of physics, college of arts and sciences, aljouf university, al qurayyat, ksa abstract samarium doped zinc oxide nanocrystals have been synthesized adopting a facile aqueous solution approach. Pbs nanoparticle sensitized zno nanowire arrays to enhance. Effect of al and n doping on structural and optical. Structural and optical properties of mn doped zno nanoparticles article pdf available in asian journal of chemistry 2312 december 2011 with 1,444 reads how we measure reads. Evidence for ptype behavior in phosphorusdoped zn,mgo grown by pulsed laser deposition is presented. There exists a great interest in zinc oxide zno materials because of their usefulness in a wide range of high technology applications, low cost, resource availability, nontoxicity and very high thermalchemical stability.
The electrical stability of indoped zno thin films deposited. Synthesis and characteristics of mg doped zno thin films. Synthesis and characterization of copper doped zinc oxide thin films for co gas sensing sachin s bharadwaja, shivaraj b wa, h n narasimha murthya, m krishna a,manjush ganiger a, mohd idrisa, pundaleek anawala,vitthal sangappa angadia adepartment of mechanical engineering, r v college of engineering, bangalore,560059, india abstract objective of this work was to synthesize copper doped zinc. 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. To date, the origin of the magnetism in co doped zno has been debated, which hinders the further manipulation of its properties. Nano express open access cudoped zno nanorod arrays.
The state of the surface was observed using an atomic force. The inset 2d view, reveals the aggregation of the crystallites to form large grains. Mar 17, 20 cudoped zno nanoparticles were synthesized by a simple chemical method at low temperature with cu. Doped zno nanorods could be synthesized either by ex situ or in situ approach. Polyol synthesized aluminum doped zinc oxide nanoparticles. The chargecarrier concentrations in the films decreased from 1. Raman study of dopedzno thin films grown by rf sputtering. Optical transmission spectra of the tmdoped samples are shown at. Optical and magnetic properties of cudoped zno nanoparticles. It has been noted that the local structure and magnetic properties of doped zno are strongly sensitive to the preparation parameters 12.
In vitro antibacterial activity of zno and nd doped zno. All these new properties of cudoped zno are very attractive for designing rt sensor with faster response to h2 gas. In this study, assynthesized pbs nanoparticles nps, which are adsorbed onto zno nws through a dipcoating method, are used to enhance the photocurrent of the zno nw photoelectrochemical anode for water splitting. Al doped zno thin films where the mott critical density is exceeded by means of zn 2p, o 1s, and al 1s xray absorption spectroscopyxas. It is worth noting that the surface of the ilcs can be used as an adsorbent for individual atoms or clusters. Nitrogen a good ptype dopant for other iivi semiconductors has long been considered as a possible dopant for ptype zno. Activation of the p dopant was achieved via laser annealing of a zinc phosphidecoated zno single crystal. 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.
Aug 11, 2015 the crystal structure of n doped zno nras was further investigated by raman scattering spectra, as illustrated in fig. The latter result is consistent with theory in that overdoping increases the antiferromagnetic direct coupling between the mn ions. Control of nimpurity states in ndoped zno, zns and znte. The sideview and topview sem images of the n doped zno nanowires are shown in fig. Xray diffraction xrd analysis reveals that the cudoped zno. Rayees ahmad zargar, manju arora, masroor ahmad and aurangzeb khurram hafiz, synthesis and characterization of vanadium doped zinc oxide thick film for chemical sensor application, journal of materials, 10. Zno and mg doped zno nanoparticles with different doping concentration were prepared by precipitation method. The deposited films were polycrystalline zno in wurtzite structure. N thin films prepared by reactive rf magnetron sputtering technique in conjunction with gas timing method. Few works were conducted on magnetic properties of rareearthdoped zno 911. A related result was reported for epitaxial zno films on gaas subjected to annealing 28. 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.
The xray photoelectron spectroscopy xps and extended x. The crystalline sizes of synthesized samples were calculated from the powder xrd patterns, which were found to decrease with the increase of cobalt content. Pure and al doped zinc oxide zno were prepared by coprecipitation method. However, like most wide bandgap semiconductors, zno has an asymmetric doping limitation1, i. Charge carrier and spin doping in zno thin films d. The effect of mg doped zno on structural and physical properties were studied in detail. Journal of chemical and pharmaceutical research, 2012, 44. Experiment zno films were grown on 1 1 cm 100 zndoped inp. Recent citations fractal and multifractal analysis of indoped zno thin films deposited on glass, ito, and silicon substrates koushik ghosh and r. Nidoped zno, autocombustion, xray diffraction, diluted.
Study of structural properties of ndoped zno thin film. Effect of cobalt doping on structural, optical, and magnetic. Apr, 2016 pure zno and neodymium nd doped zno nanoparticles nps were synthesized by the coprecipitation method. Aldoped zinc oxide azo thin films were prepared by rf magnetron sputtering at different oxygen partial pressures and substrate temperatures. Chapter 3 synthesis and characterization of mn doped zno. Optical transmission spectra of the tm doped samples are shown at the top of fig. The electrical stability of indoped zno thin films.
Cobalt codoped zinc oxide zno is one of the most promising candidates as a dms. A periodic supercell of 128 atoms has been exploited throughout the study. The concerns in zno are fed by its prospects in flat panel displays, solar cells and commercial significance in other different optoelectronic. 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. Optical and electrical properties of highly doped zno. Twostep deposition of al doped zno on pgan to form ohmic contacts xi su, guozhen zhang, xiao wang, chao chen, hao wu and chang liu abstract al doped zno azo thin films were deposited directly on pgan substrates by using a twostep deposition consisting of polymer assisted deposition pad and atomic layer deposition ald methods. Hall measurements yielded ptype behavior with a hole mobility. N films could be modified by adjusting gas timing conditions. The ftir spectra confirmed the zno stretching bands at 422 and 451 cm. Zno has good lattice matching with the indium phosphide inp crystal substrates, which has high solar conversion efficiency and high radiation resistance 3. An ito layer was first deposited on the glass substrate below zno. The transparent conducting oxide tco materials have received much attention because of their physical properties. Since the exciton binding energy of zno is about 60 mev 9, roughly three times larger than that of gan, and the biexciton formation energy of zno is about 15 mev 10, also much larger than that of gan, zno is considered. Performance evaluation of zno based rare earth element.
Doped zno transistors processed from solution at 120 c lin. Structural and xray photoelectron spectroscopy study of al. The effects of al and n doping on the structural and optical properties of the films were extensively investigated. Synthesis of al doped zno nanoparticles by aqueous. Effect of cobalt doping on structural, optical, and. Low temperature ferromagnetism and optical properties of fe doped zno nanoparticles synthesized by solgel method7 b.
In this case, homoepitaxial nitrogen doped zno was grown on semiinsulating li doped zno crystals from a high purity zn evaporation source, combined with atomic o and n flux created via a rf plasma. Advances in materials science and engineering hindawi. Zno either by narrowing the bandgap or by introducing energy levels in the bandgap of semiconductor materials. In this case, a ptype layer was reportedly produced at the gaas zno interface. The length and average diameter of the zno nanowires are 7. The main propose of this paper was concentrated on the preparation of al and ndoped zno anzo thin films by solgel spin coating technique. Analogous to doped bulk zno, 3d tmdoped zno mthe tm zno m complexesalso show intrinsic magnetism. Optical and morphological studies of ga doped zno nanocrystals. Effective nitrogen doping of zinc oxide counter and. Twostep deposition of aldoped zno on pgan to form ohmic. Effect of nio doping on structural properties of zno. The fabricated dyesensitised solar cell based on the 2. The peak to peak roughness of undoped was 59nm whereas that of doped was.
Synthesis and characterization of manganese doped zno. Photoluminescence and photocatalytic activity of mn doped. Ijsst synthesis and characterization of smdoped zinc. The effect of mg doping on the crystal structure, morphology and optical properties of the nanoparticles was also investigated. We examined structural properties of nitrogen doped zno. 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. Many reports on the nickeldoped zno diluted magnetic semiconductor with room temperature ferromagnetism in the form of thin films and nanocrystals711. The flowchart for the preparation of pr doped zno nanorods are shown in figure 3. Synthesis and characterization of cudoped zno nanorods. It can be seen that the seed layer with different concentrations of sndoped zno influenced the morphology and density of the zno nanorod arrays. Pdf structural and optical properties of mn doped zno. Recent studies show that zno based diluted magnetic semiconductors.
Diluted magnetic semiconductors dms show potential for spintronics, magnetooptical, optoelectronic, and magnetoelectronic applications because of the coexistence of optical, electrical, and magnetic properties and also their highpredicted curie temperature 1,2. Twostep deposition of aldoped zno on pgan to form ohmic contacts xi su, guozhen zhang, xiao wang, chao chen, hao wu and chang liu abstract aldoped zno azo thin films were deposited directly on pgan substrates by using a twostep deposition consisting of polymer assisted deposition pad and atomic layer deposition ald methods. Cudoped zno nanoparticles were synthesized by a simple chemical method at low temperature with cu. The ftir spectra confirmed the zno stretching bands at 468, 456, 452, and 461 cm1 for the respective zno. Pure zno and neodymium nd doped zno nanoparticles nps were synthesized by the coprecipitation method. In this project, coprecipitation method was used to synthesize mn doped zno nanoparticles. Aln codoped zno films by solgel method are still very limited.
764 241 1349 906 216 1292 1107 1155 30 1077 134 403 1414 1516 321 1216 1145 1030 674 1128 667 329 651 466 908 439 264 1093 1204 500 219 324 840 270 1378 1480 128 591 336 410 943 1454 167 872 1169 1 123