Luminescent, magnetic and optical properties of ZnO-ZnS nanocomposites

Raleaooa, Pule V.; Roodt, Andreas; Mhlongo, G.H.; Motaung, David E.; Kroon, R.E.; Ntwaeaborwa, O.M.

doi:10.1016/j.physb.2016.11.031

Cited by 60 publications

(33 citation statements)

References 21 publications

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“…Therefore, it may signify a mixed structure formation in the synthesized Zn(S,O) nanoparticles. This type of mixed structure formation in ZnS and ZnO nanoparticles has been also reported in the literature [3,4]. It has been also observed that the intensity of XRD peaks in the nanoparticles synthesized using EDTA i.e.…”

Section: Structural Analysissupporting

confidence: 82%

“…The value of this index depends upon the type of transition i.e., 1/2 for allowed indirect transition and 2 for allowed direct transition [6,31]. The energy band gap values ( It has been analyzed that these band gap values are larger than the values of bulk ZnS and ZnO separately [1,3]. However, the dependence of band gap values on the particle size in nanoregime, i.e.…”

Section: Optical Analysismentioning

confidence: 99%

“…Semiconductor nanoparticles with their novel properties and promising applications in basic research and technology have aroused great interest of the researchers all across the world. The novel properties of these nanoparticles are much different from their corresponding bulk materials arising basically from their high surface-to-volume ratio and quantum confinement effect [1][2][3]. The nanoscale size of these materials corresponding to quantum regime also enhances the role played by their surface atoms in various physical and chemical processes.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, in other studies, simultaneous existence of different phases of ZnS and ZnO in the synthesized material have been reported [11,33]. Various researchers have synthesized mixed structure ZnS-ZnO nanocomposites using different wetchemical routes [3,4]. It has been observed that ZnS nanoparticles work as excellent shell coating layers for ZnO nanoparticles and enhance the optical, photoluminescence and electrical properties of ZnO-ZnS nanostructures.…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed that ZnS nanoparticles work as excellent shell coating layers for ZnO nanoparticles and enhance the optical, photoluminescence and electrical properties of ZnO-ZnS nanostructures. The mixed structure formation of nanoparticles may tend to bring considerable changes in the different properties of semiconductor materials [3,4]. Thus, the aim of this work is to synthesize Zn(S,O) nanoparticles via simple coprecipitation technique and to study their structural, morphological and optical properties.…”

Section: Introductionmentioning

confidence: 99%

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Mixed structure Zn(S,O) nanoparticles: synthesis and characterization

Dhupar

Kumar

Sharma

et al. 2019

Materials Science-Poland

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In the present work, mixed structure Zn(S,O) nanoparticles have been synthesized using solution based chemical coprecipitation technique. Two different zinc sources (Zn(CH 3 COO) 2 ·2H 2 O and ZnSO 4 ·7H 2 O) and one sulfur source (CSNH 2 NH 2 ) have been used as primary chemical precursors for the synthesis of the nanoparticles in the presence and absence of a capping agent (EDTA). The structural, morphological, compositional and optical properties of the nanoparticles have been analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transmission infra-red (FT-IR) and UV-Visible (UV-Vis) spectroscopy. XRD revealed the formation of mixed phases of c-ZnS, h-ZnS and h-ZnO in the synthesized nanoparticles. The surface morphology was analyzed from SEM micrographs which showed noticeable changes due to the effect of EDTA. EDX analysis confirmed the presence of zinc, sulfur and oxygen in Zn(S,O) nanoparticles. FT-IR spectra identified the presence of characteristic absorption peaks of ZnS and ZnO along with other functional group elements. The optical band gap values were found to vary from 4.16 eV to 4.40 eV for Zn(S,O) nanoparticles which are higher in comparison to the band gap values of bulk ZnS and ZnO. These higher band gap values may be attributed to the mixed structure of Zn(S,O) nanoparticles.

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Section: Structural Analysissupporting

confidence: 82%

Section: Optical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mixed structure Zn(S,O) nanoparticles: synthesis and characterization

Dhupar

Kumar

Sharma

et al. 2019

Materials Science-Poland

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Heterointerface Engineering of ZnO/CdS Heterostructures through ZnS Layers for Photocatalytic Water Splitting

Guo

Liu

Yan

et al. 2022

Chemistry A European J

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Solar-driven water splitting to produce clean and renewable hydrogen offers a green strategy to address the energy crisis and environmental pollution. Heterostructure catalysts are receiving increasing attention for photocatalytic hydrogen generation. ZnO/ZnS/CdS and ZnO/CdS heterostructures have been successfully designed and prepared according to two different strategies. By introducing a heterointerface layer of ZnS between ZnO and CdS, a Z scheme charge-transfer channel was promoted and achieved superior photocatalytic performance. A highest hydrogen generation rate of 156.7 μmol g À 1 h À 1 was achieved by precise control of the thickness of the heterointerface layer and of the CdS shell. These findings demonstrated that heterostructures are promising catalysts for solar-driven water splitting, and that heterointerface engineering is an effective way to improve the photocatalytic properties of heterostructures.

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Phonons investigation of ZnO@ZnS core‐shell nanostructures with active layer

Hadžić

Matović

Randjelovic

et al. 2020

J Raman Spectroscopy

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In the present work experimental study of the ZnO@ZnS core‐shell nanostructure with an active layer obtained by conversion of zinc oxide powders with H2S is reported. Тhe prepared structures were characterized by scanning electron microscopy, X‐ray diffraction, Raman spectroscopy, and far‐infrared spectroscopy. Top surface optical phonon (TSO) in ZnO, characteristic for the cylindrical nano‐objects, the surface optical phonon (SOP) mode of ZnS, and SOP modes in ZnO@ZnS core‐shell nanostructure are registered. Local mode of oxygen in ZnS and gap mode of sulfur in ZnO are also registered. This result is due to the existence of an active layer in the space between ZnO core and ZnS shell, which is very important for the application of these materials as thermoelectrics.

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Luminescent, magnetic and optical properties of ZnO-ZnS nanocomposites

Cited by 60 publications

References 21 publications

Mixed structure Zn(S,O) nanoparticles: synthesis and characterization

Mixed structure Zn(S,O) nanoparticles: synthesis and characterization

Heterointerface Engineering of ZnO/CdS Heterostructures through ZnS Layers for Photocatalytic Water Splitting

Phonons investigation of ZnO@ZnS core‐shell nanostructures with active layer

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