Microstructure characterization of mechanically synthesized ZnS quantum dots

Patra, Sankar Narayan; Satpati, Biswarup; Pradhan, S.K.

doi:10.1063/1.3183954

Cited by 43 publications

(31 citation statements)

References 36 publications

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“…The initial reduction and then increment of particle size value with increasing milling time is due to well known fracture and re-welding mechanism of nanocrystalline particles. This mechanism of mechanosynthesis of powder materials by high-energy ball-milling is observed by several authors and also by us during the preparation of nanocrystalline ceramics [13][14][15][16].…”

Section: Resultsmentioning

confidence: 78%

“…Formation of nanocrystals in ball-milling process by fracture and re-welding mechanism results in huge amount of structural and microstructural defects, and accumulation of these lattice imperfections sometimes may lead to phase transformation in nanocrystals. To estimate the lattice imperfections and their nature in order to find the reason for phase transformation in ballmilled nanocrystalline material, X-ray characterization technique based on structure and microstructure refinement is usually preferred [13][14][15][16]. Physical properties of materials are related to the microstructure parameters and thereby controlling the microstructure, materials can be designed according to desirable properties.…”

Section: Introductionmentioning

confidence: 99%

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Mechanosynthesis of nanocrystalline titanium nitride and its microstructure characterization

Bhaskar¹,

Bid

Satpati

et al. 2010

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Mechanosynthesis of nanocrystalline titanium nitride and its microstructure characterization

Bhaskar¹,

Bid

Satpati

et al. 2010

Journal of Alloys and Compounds

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“…Adapted from [15] Nanoparticles can be effectively produced by means of high-energy ball milling. For example ZnS QDs with cubic phase have been prepared by mechanical alloying the stoichiometric mixture of Zn and S powders at room temperature in a planetary ball mill under Ar [18].…”

Section: Synthesismentioning

confidence: 99%

Group III–V and II–VI Quantum Dots and Nanoparticles

Guda

Soldatov

Солдатов

2014

Springer Series in Optical Sciences

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By decreasing the size of semiconducting material the novel properties appear from the increased surface/bulk ratio and quantum confinement effects. X-ray absorption spectroscopy (XAS) can be applied to quantum dots and nanoparticles in-situ in the colloid, on the substrate or inside a solid matrix. The structural information about average size, phase composition, and growth orientation can be extracted from XAS along with information about electronic and magnetic properties of pure and doped nanostructures. In the chapter we shall describe the general properties of quantum dots and their applications that will help to understand the tasks for spectroscopy. Case studies will provide the information that is obtained from XAS complementary to other methods. Properties and Applications of Quantum DotsNanoparticle (NP) and quantum dot (QD) are regarded as zero-dimensional nanostructures. The term "QD" is usually used for semiconductor nanoparticles and islands where quantum confinement of electrons and excitons determines their properties. Decades passed after the dependence of the spectral position of the exciton absorption lines of the nanosized CuCl crystals was attributed to the quantum size effect [1] and three-dimensionally confined semiconductor quantum wells or zero-dimensional semiconductor nanostructures showing discrete electronic states were named "QDs"

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“…In the present study, we have adopted the Rietveld's powder structure refinement analysis [28][29][30][31][32][33] of X-ray powder diffraction data to obtain the refined structural parameters, such as atomic coordinates, occupancies, lattice parameters, thermal parameters, and so forth, and microstructure parameters, such as crystallite size and r.m.s. lattice strain.…”

Section: Methods Of Microstructure Analysis By Rietveld Refinementmentioning

confidence: 99%

Microstructure, Mössbauer, and Optical Characterizations of Nanocrystalline α-Fe2O3 Synthesized by Chemical Route

et al. 2011

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Nanocrystalline α-Fe 2 O 3 of crystallite sizes ranging from 18 nm to 54 nm has been prepared by sol gel process and postannealing the powder up to 500• C. X-ray diffraction and transmission electron microscopy images have been used for determining the average crystallite sizes of the prepared samples. The Rietveld analysis reveals that the "as-prepared" α-Fe 2 O 3 powders are not completely stoichiometric, and significant (∼20%) oxygen vacancies are noticed in the α-Fe 2 O 3 lattice. Oxygen atoms in as-prepared sample are significantly displaced and the lattice is heavily distorted. With increasing annealing temperature the lattice approaches towards the stoichiometric oxygen concentration and perfect lattice configuration. Mössbauer spectrum of the unannealed (as-prepared) α-Fe 2 O 3 sample shows the superparamagnetic behavior at room temperature whereas all annealed samples show complete ferromagnetic behavior. Optical band gaps of these nanocrystalline α-Fe 2 O 3 samples have been measured from UV-Vis spectroscopy and found to decrease from 2.65 eV to 2.50 eV, like an n-type semiconductor, with increasing annealing temperature up to 500• C.

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Microstructure characterization of mechanically synthesized ZnS quantum dots

Cited by 43 publications

References 36 publications

Mechanosynthesis of nanocrystalline titanium nitride and its microstructure characterization

Mechanosynthesis of nanocrystalline titanium nitride and its microstructure characterization

Group III–V and II–VI Quantum Dots and Nanoparticles

Microstructure, Mössbauer, and Optical Characterizations of Nanocrystalline α-Fe2O3 Synthesized by Chemical Route

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