Microwave-assisted self-assembled ZnS nanoballs

Zhao, Yu; Hong, Jianming; Zhu, Jun‐Jie

doi:10.1016/j.jcrysgro.2004.06.036

Cited by 75 publications

(47 citation statements)

References 56 publications

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“…Use of this semiorganic material needs to be explored for the synthesis of metal oxides. There are few reports where thiourea (/complexes) has been used for the synthesis of ZnS [35,36].…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on the conversion of ZnS to ZnO nanoparticles synthesized by the sol-gel method using zinc acetate and thiourea

et al. 2009

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A systematic study is presented on the conversion of zinc sulfide to zinc oxide nanoparticles as a function of annealing temperature. Zinc acetate dihydrate (Zn(CH3COO)2.2H2O) and thiourea (NH2CSNH2) are used as precursors to synthesize ZnS and then ZnO. The aqueous solution of the precursor was refluxed at 90°C for over 12 h. The synthesized complex was then annealed at 300°C, 500°C, 700°C, and 900°C in air for one hour. From elemental analyses, it was found that the as-synthesized powder is a mixture of ZnS and ZnO, which annealing later converts to the zinc oxide phase only. The morphological observations revealed spherical particles of various sizes (20 nm to 300 nm) while increasing the annealing temperatures. A drastic change in the vibration bands is noticed with annealing. Photoelectron peaks related to sulfur and carbon are observed for synthesized powder, whereas, these peaks disappeared when annealed at 500°C.

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“…Use of this semiorganic material needs to be explored for the synthesis of metal oxides. There are few reports where thiourea (/complexes) has been used for the synthesis of ZnS [35,36].…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on the conversion of ZnS to ZnO nanoparticles synthesized by the sol-gel method using zinc acetate and thiourea

et al. 2009

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“…In particular, nanoparticles of the semiconductor, zinc sulfide (ZnS), are the most attractive materials for applications in areas such as IR optical devices and fast optical switching devices. Zinc sulfide nanoparticles can be prepared by different methods, such as colloidal aqueous and micellar solution synthesis method (Kho et al 2000;Khiewa et al 2005), using ultrasonic waves (Behboudnia et al 2005), microwaves (Ni et al 2004;Zhao et al 2004), and gamma-irradiation (Qiao et al 2000). In most cases, particles prepared by these methods have some problems including poor reproducibility, control of particle size, distribution and shape, etc.…”

Section: Introductionmentioning

confidence: 99%

Biological Synthesis of Semiconductor Zinc Sulfide Nanoparticles by Immobilized Rhodobacter sphaeroides

2006

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A novel, clean biological transformation reaction by immobilized Rhodobacter sphaeroides has been developed for the synthesis of zinc sulfide (ZnS) nanoparticles with an average diameter of 8 nm. The nanoparticles were examined by X-ray diffraction, transmission electron microscopy, energy dispersive analyses of X-rays, UV-vis optical absorption and photoluminescence spectra. The average diameter of ZnS nanoparticles varied according to the culture time.

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“…The band gap is greater than that of the bulk ZnS (3.7 eV) due to the quantum confinement effect associated with nanosized materials. 47 For these samples there is an absorption shoulder which extends to 420 nm and along with the yellow colour of the powder shows visible light absorption (λ ≥ 390 nm). Luminescence spectroscopy offers an insight into the mechanism of the visible light absorption.…”

Section: Resultsmentioning

confidence: 98%

“…The H 2 S reacts with the liberated zinc ion from the zinc acetate solution, to form ZnS, equation (2). Zhao et al 42 found that using zinc acetate as a precursor can lead to the ZnS agglomerating with the presence of the acetate. The acetate molecules interact with the surface of the ZnS crystals and cause the agglomeration.…”

Section: Resultsmentioning

confidence: 99%

Anti-bacterial activity of indoor-light activated photocatalysts

Synnott

Seery²,

Hinder

et al. 2013

Applied Catalysis B: Environmental

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Nanocrystalline photocatalysts, prepared under ambient conditions using a microwave assisted synthesis, show indoor light photocatalytic activity for the degradation of S. aureus and E. coli. The zinc sulfide (ZnS) nanomaterials, prepared by a microwave assisted synthesis, are shown to be cubic blende structure with an average crystallite size of 4 -6 nm. The anti-bacterial activity of these nanomaterials is investigated under irradiation from a 60 -watt light bulb and photocatalytic activity is revealed to be due to the defects present in the crystal structure. The ZnS shows anti-bacterial action as both a bacteriostatic and bacteriocidal (88 % reduction in the amount of bacteria in 5 h) material and the methods of bacterial degradation on the ZnS is discussed. The anti-bacterial actions of these materials were also compared with commercial ZnS and Evonik-Degussa P-25. A detailed mechanism for the light absorption in the visible light region of the microwave prepared ZnS is proposed based on the luminescence spectroscopy.

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Microwave-assisted self-assembled ZnS nanoballs

Cited by 75 publications

References 56 publications

Effect of annealing on the conversion of ZnS to ZnO nanoparticles synthesized by the sol-gel method using zinc acetate and thiourea

Effect of annealing on the conversion of ZnS to ZnO nanoparticles synthesized by the sol-gel method using zinc acetate and thiourea

Biological Synthesis of Semiconductor Zinc Sulfide Nanoparticles by Immobilized Rhodobacter sphaeroides

Anti-bacterial activity of indoor-light activated photocatalysts

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