Sonochemical synthesis of Dy-doped ZnO nanostructures and their photocatalytic properties

Yayapao, Oranuch; Thongtem, Titipun; Phuruangrat, Anukorn; Thongtem, Somchai

doi:10.1016/j.jallcom.2013.04.133

Cited by 131 publications

(43 citation statements)

References 49 publications

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“…This red shift in the absorbance of ZnO after doping is owing to increase of particle size with Co and Dy doping which is supported by our XRD results [30]. Another reason for this red shift can be related to the formation of a shallow level inside the band gap because of impurity atoms (Dy 3+ ) introduced into the wurtzite ZnO lattice [40]. This spectra reveal that pure ZnO particles have low absorbance in the visible region, which is a characteristic of ZnO.…”

Section: Optical Absorption Studiessupporting

confidence: 78%

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Thangeeswari

Murugasen

Velmurugan

2015

J Supercond Nov Magn

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Dysprosium-(Dy) and cobalt (Co)-doped zinc oxide (ZnO) nanoparticles with various concentrations have been synthesized by simple chemical precipitation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDAX) measurements were conducted respectively for the structural, morphological, and compositional investigation of the sample. XRD analysis indicated that diffraction peaks of all the samples can be indexed to the hexagonal wurtzite structure of ZnO. No secondary phases including Co and Dy ions were detected in the samples even for the highest doping concentrations of Dy. Average particle size is found to be 25-34 nm. Scanning electron microscope and transmission electron microscope analysis revealed that the dopant atoms of Co and Dy are homogeneously distributed in ZnO wurtzite structure. The samples were characterized by EDAX to confirm the expected stoichiometry. In the photoluminescence spectra, Dy co-doped samples show a violet emission along with a broad yellow emission due to the 4 F 9/2 -6 H 15/2 inner shell transitions of Dy 3+ ion. The photoluminescence (PL) enhancement process in Dy co-doped ZnO:Co is mainly due to Dy as a sensibilizer which could effectively enhance the luminescence intensity. Absorption spectra of dysprosium-(Dy) and cobalt (Co)-doped ZnO nanoparticles exhibited enhanced optical absorption in visible region. Magnetization measurements have shown that the particles have room temperature ferromagnetic behavior with relatively high coercive fields which are decreasing with the increase of doping concentration. The analysis of optical and magnetic properties shows that Co-and Dy-doped ZnO nanoparticles are a promising material for DMS application and have potential applications in optoelectronic devices.

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Section: Optical Absorption Studiessupporting

confidence: 78%

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Thangeeswari

Murugasen

Velmurugan

2015

J Supercond Nov Magn

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“…Zn doping may lead to the formation of shallow levels inside the band gap of CuO nanostructures causing reduction in E g . 27 Moreover, the reduction of E g may be also regarded as the consequence of combined transition from oxygen 2p states to d sates of Cu and Zn.…”

Section: Optical Studymentioning

confidence: 99%

Facile synthesis of Zn doped CuO hierarchical nanostructures: Structural, optical and antibacterial properties

et al. 2015

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ZnxCu1−xO (where x= 0, 0.01, 0.03, 0.05, 0.07 and 0.1 mol%) hierarchical nanostructures have been prepared via soft chemical route. X-ray diffraction (XRD) results of the synthesized samples reveal the monoclinic structure of CuO without any impurity related phases. The micro-structural parameters such as crystallite size and microstrain have been strongly influenced by Zn doping. Scanning electron microscope (SEM) analyses depict the formation of hierarchical nanostructures having average particle size in the range of 26-43 nm. The surface area of CuO nanostructures has been reduced systematically with the increase in Zn content which is linked with the variations in particle size. An obvious decrease in the optical band gap energy of the synthesized CuO hierarchical nanostructures has been observed with Zn doping which is assigned to the formation of shallow levels in the band gap of CuO and combined transition from oxygen 2p states to d sates of Cu and Zn ions. The bactericidal potency of the CuO hierarchical nanostructures have been found to be enhanced remarkably with Zn doping.

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“…The photodegradation of various organic dyes using Nd-doped ZnO nanostructures showed that Nd ions highly influence the enhancement of photodegradation properties [19,20]. Similarly, Yayapao and his co-workers have studied the degradation of methylene blue under UV radiation using Dy-doped ZnO nanostructures [21] in which the doping of Dy ion leads to the excellent optical property and higher photocatalytic activity than that of pure ZnO. However, the photodegradation of organic dyes using Sm 3?…”

Section: Introductionmentioning

confidence: 99%

UV-A light-induced photodegradation of Acid Blue 113 in the presence of Sm-doped ZnO nanostructures

et al. 2015

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In this report, optical and photocatalytic degradation of Acid Blue 113 (AB 113) has been investigated in an aqueous heterogeneous media containing pure and Sm-doped ZnO nanostructures which were prepared by a simple wet chemical route. X-ray diffraction measurement confirmed that the prepared nanostructures were in hexagonal wurtzite structure and the dopant Sm ion was incorporated into the Zn lattice. Interesting morphological changes involving a nanosheet-star-spherical transition were observed upon Sm doping and annealing, which were identified through transmission electron microscope. Optical absorption measurements showed an exciton absorption band and a band gap narrowing with respect to the Sm concentrations. The photodegradation of Acid Blue 113 under UV-A radiation by using pure and Sm-doped ZnO nanostructures showed that samarium played an important role in the significant improvement of the photodegradation efficiency and the optimum amount of Sm ion was found to be 1 mmol %. Further, the possible degradation mechanism was proposed herein.

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Sonochemical synthesis of Dy-doped ZnO nanostructures and their photocatalytic properties

Cited by 131 publications

References 49 publications

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Facile synthesis of Zn doped CuO hierarchical nanostructures: Structural, optical and antibacterial properties

UV-A light-induced photodegradation of Acid Blue 113 in the presence of Sm-doped ZnO nanostructures

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