Influence of surfactant structures in luminescence enhancement dynamics during nucleation and growth of aqueous ZnS nanoparticles and their photoactivation due to illumination with UV/visible light

Mehta, S.K.; Kumar, Sanjay

doi:10.1016/j.jlumin.2010.07.022

Cited by 9 publications

(2 citation statements)

References 33 publications

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“…For example, tri‐ n ‐octylphosphine oxide‐(TOPO) capped CdSe show mostly bandedge emission and weak trap state emission, which is an indication of a high quality sample 112–114. Luminescence may also be enhanced by surface modification techniques115–119 or using core/shell structures 120–123. Nanoparticles that have been found to show strong PL include CdSe, CdS, and ZnS 124–126.…”

Section: Optical Propertiesmentioning

confidence: 99%

Exciton Dynamics in Semiconductor Nanocrystals

2013

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This review article provides an overview of recent advances in the study and understanding of dynamics of excitons in semiconductor nanocrystals (NCs) or quantum dots (QDs). Emphasis is placed on the relationship between exciton dynamics and optical properties, both linear and nonlinear. We also focus on the unique aspects of exciton dynamics in semiconductor NCs as compared to those in bulk crystals. Various experimental techniques for probing exciton dynamics, particularly time-resolved laser methods, are reviewed. Relevant models and computational studies are also briefly presented. By comparing different materials systems, a unifying picture is proposed to account for the major dynamic features of excitons in semiconductor QDs. While the specific dynamic processes involved are material-dependent, key processes can be identified for all the materials that include electronic dephasing, intraband relaxation, trapping, and interband recombination of free and trapped charge carriers (electron and hole). Exciton dynamics play a critical role in the fundamental properties and functionalities of nanomaterials of interest for a variety of applications including optical detectors, solar energy conversion, lasers, and sensors. A better understanding of exciton dynamics in nanomaterials is thus important both fundamentally and technologically.

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Section: Optical Propertiesmentioning

confidence: 99%

Exciton Dynamics in Semiconductor Nanocrystals

2013

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“…Modern technology demands new UV sources especially for scintillation [1], for read heads to reduce data storage space, and for bio-imaging applications [2]. ZnS is a semiconductor material with large exciton binding energy of about 40 meV at room temperature [3].…”

Section: Introductionmentioning

confidence: 99%

Boosted UV emission at 349 nm from mesoporous ZnS

2013

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Relatively oxygen-free mesoporous cubic ZnS particles were synthesised via a facile solvo-hydrothermal route using a water-acetonitrile combination. Boosted UV emission at 349 nm is observed from the ZnS prepared by the solvo-hydrothermal route. The increased intensity of this UV emission is attributed to activation of whispering gallery modes of almost elliptical microstructures made of porous nanostructures.

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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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Influence of surfactant structures in luminescence enhancement dynamics during nucleation and growth of aqueous ZnS nanoparticles and their photoactivation due to illumination with UV/visible light

Cited by 9 publications

References 33 publications

Exciton Dynamics in Semiconductor Nanocrystals

Exciton Dynamics in Semiconductor Nanocrystals

Boosted UV emission at 349 nm from mesoporous ZnS

Anti-bacterial activity of indoor-light activated photocatalysts

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