Photophysical properties of ZnS nanoclusters

Kumbhojkar, Neelesh; Nikesh, V. V.; Kshirsagar, Anjali; Mahamuni, Shailaja

doi:10.1063/1.1321027

Cited by 193 publications

(105 citation statements)

References 29 publications

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“…This red shift of the energy band gap with increasing cobalt concentration is interpreted as mainly due to the sp-d exchange interactions between the band electrons and the localized d electrons of the Co 2? ions substituting host ions and is consistent with the reported results (Kumbhoikar et al 2000), giving an additional evidence of cobalt substitution (Singhal et al 2010). Also the calculated particle size of the uncapped and PVP-capped CdS:Co 2?…”

Section: Uv-visible Absorptionsupporting

confidence: 81%

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

2014

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Co 2? (1-5 and 10 %)-doped cadmium sulfide nanoparticles were synthesized by the chemical precipitation method using polyvinyl pyrrolidone (PVP) as a surfactant. The X-ray diffraction results showed that Co ions were successfully incorporated into the CdS lattice and the transmission electron microscopy results revealed that the synthesized particles were aligned as rod-like structures. The absorption spectra of all the prepared samples (undoped and doped) were significantly blue shifted (472-504 nm) from the bulk CdS (512 nm). However, the absorption spectra of the doped samples were red shifted (408-504 nm) with respect to the doping concentrations (1-5 and 10 %). Furthermore, a dramatic blue shift absorption is observed at 472 nm for PVP-capped CdS:Co 2? (4 %) nanoparticles. In the photoluminescence study, two emission peaks were dominated in the green region at 529 and 545 nm corresponding the CdS:Co 2? nanoparticles. By correlating optical and EPR spectral data, the site symmetry of Co 2? ion in the host lattice was determined as both octahedral and tetrahedral. The presence of functional groups in the synthesized nanoparticles was identified by Fourier transform infrared spectroscopy. The thermal stability of the Co ions in CdS nanoparticles was studied by TG-DTA. In addition, an electrochemical property of the undoped and doped samples was studied by cyclic voltammetry for electrode applications.

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Section: Uv-visible Absorptionsupporting

confidence: 81%

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

2014

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“…Some authors [29] have proposed that the PL properties of ZnS nanocrystals can be asssociated to surface defects.…”

Section: <Figs 7>mentioning

confidence: 99%

Structural and optical properties of ZnS/MgNb2O6 heterostructures

Santos

Cavalcante

Fabbro

et al. 2015

Superlattices and Microstructures

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“…As a result, with the decreasing particle size the blue-shift of the band-edge emission peak wavelength is expected [33]. Therefore, the red-shift of the radiative emission peak with the increase in the pH-value of the polyion assembly and number of the reaction cycles may be attributed to the increase in the size of the ZnS nanocrystallites in the polyion matrix.…”

Section: Figure 8 Pl Spectra Of the Zns Nanoparticle In Polyion Matrmentioning

confidence: 95%

Polyelectrolyte Multilayer Template Assisted in-Situ Synthesis of the Inorganic Nanostructures

Logar¹,

Jančar²,

Rečnik³

et al. 2010

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Apstract:Multilayers formed from weak polyions of polyallylamine (PAH) and polyacrylic acid (PAA), possessing ion-exchangeable carboxylic groups were used to bind the metal cations within the film. By subsequent wet chemical reaction process of the incorporated metal ions, pure zinc sulfide (ZnS) with a narrow size distribution was formed within the PEMs. The size and concentration of the inorganic nanoparticles in polyion matrix were controlled by the concentration of metal -binding carboxylic acid groups as determined by the multilayer assembly pH. Furthermore, the metal cation loading and reaction methodology could be repeatedly cycled to increase the size and volume density of the nanoparticles. Furthermore, the polyelectrolyte multilayer films were used as templates for the ceramic (TiO 2 ) thin film fabrication with a modified sol-gel reaction. Since the multilayer assembly is performed from the polyion aqueous solutions, the multilayers contain some water that, after infiltration of the organometallic precursor, enables in-situ reaction of hydrolysis and condensation reaction. After calcination, nanocrystalline TiO 2 thin films with thickness, controllable by the number of the polyion layers in the matrix, were formed. With the in-situ synthesis approach of inorganic nanstructures in polyelectrolyte multilayer matrix, the ability of obtaining the control over the film thickness and size of the inorganic particles has enabled the tuning of the optical properties of as fabricated inorganic-organic composite films, as well as nanocrystalline ceramic films.

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Photophysical properties of ZnS nanoclusters

Cited by 193 publications

References 29 publications

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

Optical, electrochemical and thermal properties of Co2+-doped CdS nanoparticles using polyvinylpyrrolidone

Structural and optical properties of ZnS/MgNb2O6 heterostructures

Polyelectrolyte Multilayer Template Assisted in-Situ Synthesis of the Inorganic Nanostructures

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