Optical studies of Cd2+ and Mn2+ Co-doped ZnS nanocrystals

Mall, Monika; Kumar, Lokendra

doi:10.1016/j.jlumin.2009.11.012

Cited by 57 publications

(20 citation statements)

References 32 publications

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“…Such nature of excitonic absorption peaks is attributed to the quantum size effect [27]. It is also known that the excitonic peaks get broadened to a wide range when peaks of different exciton energies overlap [28,29]. More importantly, our study indicates that a fine tuning of optical band gap is possible to a desirable range just by changing the size and composition of the material.…”

Section: Structural Studiessupporting

confidence: 55%

Investigation on the synthesis and quantum confinement effects of pure and Mn2+ added Zn(1−x)CdxS nanocrystals

Saravanan

Pukazhselvan

Mahadevan

2011

Journal of Alloys and Compounds

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Section: Structural Studiessupporting

confidence: 55%

Investigation on the synthesis and quantum confinement effects of pure and Mn2+ added Zn(1−x)CdxS nanocrystals

Saravanan

Pukazhselvan

Mahadevan

2011

Journal of Alloys and Compounds

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“…possesses smaller ionic radii (0.66 Å ) than Cd 2? (0.97 Å ) [21]. Further small shifts in the peak position in Mn doped CdS nanoparticles ascertain to the incorporation of Mn 2?…”

Section: Resultsmentioning

confidence: 91%

Optical, electrochemical and thermal properties of Mn2+ doped CdS nanoparticles

2015

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Mn 2? doped (1-5 and 10 %) CdS nanoparticles have been synthesized by the chemical precipitation method using polyvinylpyrrolidone as a capping agent. The particle size, morphology and optical properties have been studied by X-ray powder diffraction, transmission electron microscopy, UV-Visible and photoluminescence spectroscopy. Powder diffraction data have confirmed that the crystallite size is around 2-5 nm. The band gap of the nanoparticles has been calculated using UV-Visible absorption spectra. An optimum concentration, Mn 2? (3 %) has been selected by optical study. The functional groups of the capping agent have been identified by fourier transform infrared spectroscopy study. The presence of dopant (Mn 2? ) has been confirmed by electron paramagnetic resonance spectroscopy. Thermal properties of CdS:Mn 2? have been analyzed using thermogravimetric-differential thermal analyser. The electrochemical properties of the undoped and doped samples have been studied by cyclic voltammetry for electrode applications. In addition, magnetic properties of Mn 2? doped CdS have been studied using a vibrating sample magnetometer.

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“…This shift in band gap can be explained by the effective mass approximation model with the particle in a box approach [31]. Based on the first order approximation of Brus equation [32], the relationship between the particle radius (r) and band gap E g in ZnS nanocrystal [33] is given by rðE g Þ ¼ 0:32 À 2:9 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ðE g À 3:49Þ p 2ð3:50 À E g Þ ð1Þ…”

Section: Resultsmentioning

confidence: 99%

Investigating Fluorescence Quenching of ZnS Quantum Dots by Silver Nanoparticles

et al. 2010

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Water dispersible zinc sulfide quantum dots (ZnS QDs) with an average diameter of 2.9 nm were synthesized in an environment friendly method using chitosan as stabilizing agent. These nanocrystals displayed characteristic absorption and emission spectra having an absorbance edge at 300 nm and emission maxima (λ emission ) at 427 nm. Citrate-capped silver nanoparticles (Ag NPs) of ca. 37-nm diameter were prepared by modified Turkevich process. The fluorescence of ZnS QDs was significantly quenched in presence of Ag NPs in a concentration-dependent manner with K sv value of 9×10 9 M −1 . The quenching mechanism was analyzed using Stern-Volmer plot which indicated mixed nature of quenching. Static mechanism was evident from the formation of electrostatic complex between positively charged ZnS QDs and negatively charged Ag NPs as confirmed by absorbance study. Due to excellent overlap between ZnS QDs emission and surface plasmon resonance band of Ag NPs, the role of energy transfer process as an additional quenching mechanism was investigated by time-resolved fluorescence measurements. Time-correlated single-photon counting study demonstrated decrease in average lifetime of ZnS QDs fluorescence in presence of Ag NPs. The corresponding Förster distance for the present QD-NP pair was calculated to be 18.4 nm.

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Optical studies of Cd2+ and Mn2+ Co-doped ZnS nanocrystals

Cited by 57 publications

References 32 publications

Investigation on the synthesis and quantum confinement effects of pure and Mn2+ added Zn(1−x)CdxS nanocrystals

Investigation on the synthesis and quantum confinement effects of pure and Mn2+ added Zn(1−x)CdxS nanocrystals

Optical, electrochemical and thermal properties of Mn2+ doped CdS nanoparticles

Investigating Fluorescence Quenching of ZnS Quantum Dots by Silver Nanoparticles

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