Synthesis and properties of transition metals and rare-earth metals doped ZnS nanoparticles

He, Hong; Zhang, Weihua

doi:10.1016/j.optmat.2005.03.015

Cited by 249 publications

(107 citation statements)

References 103 publications

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“…[1][2][3][4][5][6] Nanoparticle represents the state of matter, somewhere between the molecular and the extended solid state. It is well known that the optical properties like absorption of the nanosized metals differ drastically from the properties of the bulk material due to the change in energy band gap.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of copper quantum dots by chemical reduction method and tailoring of its band gap

Prabhash

Nair

2016

AIP Advances

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Metallic copper nano particles are synthesized with citric acid and CTAB (cetyltrimethylammonium bromide) as surfactant and chlorides as precursors. The particle size and surface morphology are analyzed by High Resolution Transmission Electron Microscopy. The average size of the nano particle is found to be 3 - 10 nm. The optical absorption characteristics are done by UV-Visible spectrophotometer. From the Tauc plots, the energy band gaps are calculated and because of their smaller size the particles have much higher band gap than the bulk material. The energy band gap is changed from 3.67 eV to 4.27 eV in citric acid coated copper quantum dots and 4.17 eV to 4.52 eV in CTAB coated copper quantum dots.

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Section: Introductionmentioning

confidence: 99%

Synthesis of copper quantum dots by chemical reduction method and tailoring of its band gap

Prabhash

Nair

2016

AIP Advances

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“…[36] It is also a component in tape used by athletes as a bandage to prevent soft tissue damage during workouts. [37] These materials have been successfully used for water disinfection and purification. [38] The present work reports the antimicrobial and photocatalytic activities of Mn-and Fe-doped ZnO NPs synthesised using chemical coprecipitation method.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Sharma

Jandaik

Kumar

et al. 2015

Journal of Experimental Nanoscience

109

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The present work reports study on antimicrobial activity of pure and doped ZnO nanocomposites. Polyvinyl pyrrolidone capped Mn-and Fe-doped ZnO nanocomposites were synthesised using simple chemical co-precipitation technique. The synthesised materials were characterised using transmission electron microscope (TEM), X-ray powder diffraction (XRD), energy dispersive X-ray fluorescence (EDXRF), Fourier transform infrared (FTIR) spectroscopy and ultraviolet (UV) visible spectroscopy. The XRD and TEM studies reveal that the synthesised ZnO nanocrystals have a hexagonal wurtzite structure with average crystalline size »7À14 nm. EDXRF and FTIR study confirmed the doping and the incorporation of impurity in ZnO nanostructure. The antimicrobial activities of nanoparticles (NPs) were studied against fungi, grampositive and gram-negative bacteria using the standard disc diffusion method. The photocatalytic activities of prepared NPs were evaluated by degradation of methylene blue dye in aqueous solution under UV light irradiation. Experimental results demonstrated that ZnO NPs doped with 10% of Mn and Fe ions showed maximum antimicrobial and photodegradation efficiency in contrast with that of the 1% loading. The enhancement in antimicrobial effect and photocatalytic degradation is attributed to the generation of reactive oxygen species due to the synergistic effects of Mn and Fe loading.

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“…In recent years, semiconductor nanoparticles exhibit specific properties due to the quantum confinement effects, as a consequence of their size in nanometric range and the special luminescent properties caused by widening the band gap when the spatial dimension is reduced (Brus 1986;Rossetti et al 1985;Hu and Zhang. 2006).…”

Section: Introductionmentioning

confidence: 99%

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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Synthesis and properties of transition metals and rare-earth metals doped ZnS nanoparticles

Cited by 249 publications

References 103 publications

Synthesis of copper quantum dots by chemical reduction method and tailoring of its band gap

Synthesis of copper quantum dots by chemical reduction method and tailoring of its band gap

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

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

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