ZnS nanocrystals and nanoflowers synthesized by a green chemistry approach: Rare excitonic photoluminescence achieved by the tunable molar ratio of precursors

Xiao, Ningru; Dai, Qiang; Wang, Yingnan; Ning, Jiajia; Liu, Bingbing; Zou, Guangtian; Bo, Zhishan

doi:10.1016/j.jhazmat.2011.11.020

Cited by 15 publications

(9 citation statements)

References 38 publications

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“…Xiao et al . [ 91 ] demonstrated the shape evolution of ZnS nanoparticles in a green chemistry approach by employing olive oil as both solvent and capping agent. Specifically, a solution (made of 0.2 mmol of sulfur powder and 1 ml of olive oil, prepared at 100°C) was swiftly injected into a hot ZnO powder solution (consisting of 5 ml of olive oil and 0.4 mmol ZnO powder) at 330°C (Schlenk line with nitrogen gas).…”

Section: Syntheses and Surface Functionalization Of Nanoparticlesmentioning

confidence: 99%

Castor oil: a suitable green source of capping agent for nanoparticle syntheses and facile surface functionalization

2018

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Castor oil (CO) is an inedible vegetable oil (VO) that has been employed extensively as a bioresource material for the synthesis of biodegradable polymers, cosmetics, lubricants, biofuels, coatings and adhesives. It is used in medicine, pharmaceuticals and biorefineries, due to its versatile chemistry. However, there has been less focus on CO as an alternative to toxic and expensive solvents, and capping/stabilizing agents routinely used in nanoparticle syntheses. It provides a richer chemistry than edible VOs as a solvent for green syntheses of nanoparticles. CO, being the only rich source of ricinoleic acid (RA), has been used as a solvent, co-solvent, stabilizing agent and polyol for the formation of polymer–nanoparticle composites. RA is a suitable alternative to oleic acid used as a capping and/or stabilizing agent. Unlike oleic acid, it provides a facile route to the functionalization of surfaces of nanoparticles and the coating of nanoparticles with polymers. For applications requiring more polar organic solvents, RA is more preferred than oleic acid. In this review, we discuss the production, chemical and physical properties, triglyceride and fatty acid (FA) compositions and applications of CO, focusing on the use of CO and RA as well as other VOs and FAs in syntheses of nanoparticles and surface functionalization.

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Section: Syntheses and Surface Functionalization Of Nanoparticlesmentioning

confidence: 99%

Castor oil: a suitable green source of capping agent for nanoparticle syntheses and facile surface functionalization

2018

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“…6−8 Other than oxides, metal chalcogenides have also created impressions as photocatalyst, and ZnS is an important example of this class of photocatalyst. ZnS has been tailor-made in various fascinating morphologies such as nanobelts, 9 stackedpyramid, 10 nanocombs, 11 spheres, 12,13 nanoflowers, 14 and so on to meet the demands of high-performance applications such as fungicides, 15 solar cells, 16 sensors, 17 and light-emitting diodes (LEDs), 18 photocatalysts, 19 and electro-optical devices, 20 among others. However, poor response to visible light and high recombination rate of excitons significantly confine its realistic uses.…”

Section: Introductionmentioning

confidence: 99%

“…In the past decade, nanostructures of semiconductors have achieved global recognition as photocatalysts for wastewater treatment because of their varied band gaps, high specific surface area, thermal and chemical stability, and so on. , Most studied photocatalysts are oxides of titanium − and zinc. − Other than oxides, metal chalcogenides have also created impressions as photocatalyst, and ZnS is an important example of this class of photocatalyst. ZnS has been tailor-made in various fascinating morphologies such as nanobelts, stacked-pyramid, nanocombs, spheres, , nanoflowers, and so on to meet the demands of high-performance applications such as fungicides, solar cells, sensors, and light-emitting diodes (LEDs), photocatalysts, and electro-optical devices, among others. However, poor response to visible light and high recombination rate of excitons significantly confine its realistic uses.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnS Hollow Spheres and RGO-ZnS Nanocomposite Using Cysteamine as Novel Sulfur Source: Photocatalytic Performance on Industrial Dyes and Effluent

Dutta

Chatterjee

Mukherjee

et al. 2017

Ind. Eng. Chem. Res.

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A facile one-pot hydrothermal synthesis of hollow ball-like ZnS nanostructures is reported using cysteamine, an ecofriendly sulfur source. Following similar protocol, a heterostructure of RGO-ZnS nanocomposite have been synthesized. The as-synthesized samples are structurally and optically characterized using different techniques. The photocatalytic activity of RGO-ZnS has been found to be ∼9% higher than that of ball-like ZnS nanostructures at a dose of 0.4 g/L. This result is attributed to the improved charge transport by hindering charge recombination of photoinduced excitons. One of the significant findings of this work is that the model anionic dye degraded better under alkaline condition with ZnS whereas the trend is reversed for RGO-ZnS composite. The removal efficiency of both the systems is allied with structural, morphological, and optical properties to understand the underlying mechanism of synthesis as well as photocatalysis process.

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“…Temporal evolution of PL QYs of ZnS NCs synthesized with different S:Zn molar ratios (a) S/Zn = 1:2, (b) S/Zn = 1:1, and (c) S/Zn = 2:1. Reproduced with permission from ref . Copyright 2011 Elsevier B.V.…”

Section: Changes In Photophysical Propertiesmentioning

confidence: 99%

“…Xiao et al demonstrated that PL properties could be tuned by controlling the molar ratio of precursors, and pure excitonic emission can be obtained. 162 It was observed that the trap state emission (ascribed to sulfur vacancies) can be eliminated if excess of sulfur precursors was used during the synthesis, leading to pure excitonic emission. The temporal evolutions of PL QYs (as evident from Figures 20 and 21 Mn 2+ ions in ZnS nanoparticles in the PLE spectrum.…”

Section: ■ Changes In Photophysical Propertiesmentioning

confidence: 99%

Critical Analysis of Phase Evolution, Morphological Control, Growth Mechanism and Photophysical Applications of ZnS Nanostructures (Zero-Dimensional to Three-Dimensional): A Review

Tiwari¹,

Dhoble

2016

Crystal Growth & Design

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ZnS nanostructures are prominent and promising candidates of class II−IV semiconductor materials that can be prepared by sophisticated techniques. Transition of the material from bulk to nanosize brings forth drastic changes in various properties particularly the photophysical properties. In recent years research has been focused on modifying and manipulating the morphologies of ZnS nanostructures for fabricating photocatalysts, photonic devices, biolabeling agent, optical sensors, detectors, and other novel applications. This review article addresses phase evolution (theoretical modeling approach and experimental validation), morphological control, growth mechanisms based on thermodynamic considerations, surface energy driven models, kinematics, template directed growth, etc., and understanding of the photophysical properties of ZnS based on the dimension of nanostructures (zero-dimensional to three-dimensional). A broad overview is presented for various synthesis techniques from the aspect of different morphologies (peculiar morphologies such as nanosaws, nanospines, nanoswords, nanocircles, cauliflower like structures, etc.) and phase control of the nanostructures followed by discussion of the possible growth mechanism. Some of the novel techniques such as photochemical methods, direct templating routes, and nucleation doping strategies have been included. The structural changes occurring with incorporation of various transition metal ions into the ZnS host and the dependence of fascinating photophysical properties on the different reaction conditions and parameters along with recent advancement in their applications have been introduced in the later sections. The parameters have been discussed and analyzed for tuning the various luminescent properties based on the dimension of the ZnS nanoparticles. We tried to summarize the current status of the research, discuss the issues and concerns in the present scenario, and provide suggestions for further exploration in other potential directions.

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ZnS nanocrystals and nanoflowers synthesized by a green chemistry approach: Rare excitonic photoluminescence achieved by the tunable molar ratio of precursors

Cited by 15 publications

References 38 publications

Castor oil: a suitable green source of capping agent for nanoparticle syntheses and facile surface functionalization

Castor oil: a suitable green source of capping agent for nanoparticle syntheses and facile surface functionalization

Fabrication of ZnS Hollow Spheres and RGO-ZnS Nanocomposite Using Cysteamine as Novel Sulfur Source: Photocatalytic Performance on Industrial Dyes and Effluent

Critical Analysis of Phase Evolution, Morphological Control, Growth Mechanism and Photophysical Applications of ZnS Nanostructures (Zero-Dimensional to Three-Dimensional): A Review

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