Structural and optical studies of Zn1−xCdxS quantum dots synthesized by in situ technique in PVA matrix

Vineeshkumar, T.V.; Raj, D. Rithesh; Prasanth, S.; Unnikrishnan, N.V.; Philip, Reji; Sudarsanakumar, C.

doi:10.1016/j.optmat.2014.06.037

Cited by 40 publications

(18 citation statements)

References 46 publications

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“…crystalline size (7 nm) was estimated from the Debye-Scherrer formula [30,31]. Interactions of BSA with CuS nanoparticles were carried out in millipore water.…”

Section: Introductionmentioning

confidence: 99%

Exploring the interaction of l-cysteine capped CuS nanoparticles with bovine serum albumin (BSA): a spectroscopic study

et al. 2016

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The interactions between nanoparticles and proteins have prime importance in nanomedicine and nanotoxicology. L-cysteine capped copper sulfide (Cy-CuS) nanoparticles having average particle size of 6 nm have been synthesized using chemical coprecipitation method and their interactions with Bovine Serum Albumin (BSA) were explored using various spectroscopic techniques. A ground state complex is formed between BSA and Cy-CuS nanoparticles in solution. The number of binding sites, binding constant, quenching constant and the binding distance between Cy-CuS nanoparticles and BSA were determined. The overall conformation of BSA in the complex was unaltered, however the α-helical content of BSA was marginally reduced.

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“…crystalline size (7 nm) was estimated from the Debye-Scherrer formula [30,31]. Interactions of BSA with CuS nanoparticles were carried out in millipore water.…”

Section: Introductionmentioning

confidence: 99%

Exploring the interaction of l-cysteine capped CuS nanoparticles with bovine serum albumin (BSA): a spectroscopic study

et al. 2016

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“…Additionally, functions such as self cleaning 54 can also be explored based on dispersed silica microspheres. The dispersion of dielectric microspheres can also be used in other luminescent films such as inorganic semiconductor doped polymers 55 , dye doped polymers 56 , and OLEDs.…”

Section: Resultsmentioning

confidence: 99%

Enhancing photoluminescence of carbon quantum dots doped PVA films with randomly dispersed silica microspheres

Zhao

Wang

Gao

et al. 2020

Sci Rep

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As a kind of excellent photoluminescent material, carbon quantum dots have been extensively studied in many fields, including biomedical applications and optoelectronic devices. They have been dispersed in polymer matrices to form luminescent films which can be used in LEDs, displays, sensors, etc. Owing to the total internal reflection at the flat polymer/air interfaces, a significant portion of the emitted light are trapped and dissipated. In this paper, we fabricate free standing flexible PVA films with photoluminescent carbon quantum dots embedded in them. We disperse silica microspheres at the film surfaces to couple out the total internal reflection. The effects of sphere densities and diameters on the enhancement of photoluminescence are experimentally investigated with a homemade microscope. The enhancement of fluorescence intensity is as high as 1.83 when the film is fully covered by spheres of 0.86 $${\boldsymbol{\mu }}$$µm diameter. It is worth noting that the light extraction originates from rather the scattering of individual spheres than the diffraction of ordered arrays. The mechanism of scattering is confirmed by numerical simulations. The simulated results show that the evanescent wave at the flat PVA/air interface can be effectively scattered out of the film.

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“…The 1LO peak shifts towards the lower frequency side and broadening with the increase of Zn content in CdS by exhibiting asymmetric nature [28]. The frequency shift in Raman peaks is due to the nanoparticles grain size effect and the decrease in the crystallite size of the films also indicates the asymmetry [29]. The 1LO modes of the films shifted towards the lower frequency may be due to stress, strain effects, phonon confinement, defects, and variation in phonon relations with the grain size [30].…”

Section: Raman Spectroscopymentioning

confidence: 94%

Structural, surface morphological, optical and thermoelectric properties of sol–gel spin coated Zn doped CdS thin films

2020

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The present work is focussed on Zinc (2, 4, 6, 8 and 10 wt%) doped CdS thin films synthesized by sol-gel spin coating method and deposited on glass substrates. X-ray diffraction patterns of Zn doped CdS thin films exhibit cubic structure. The microstructural properties such as crystallite size, lattice constant, microstrain, dislocation density and stacking fault probability in the films were reported. The surface morphology and topography of the films was studied by using field emission scanning electron microscopy and atomic force microscopy. The incorporation of Zn in CdS and elemental composition of the films has been confirmed with X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS). Raman spectrum of Zn doped CdS thin films exhibits 1LO and 2LO phonon modes. The optical band gap of CdS thin films increased from 2.63 to 2.73 eV with the increase of Zn dopant from 2 to 10%. Thermoelectric power measurements show negative Seebeck coefficient indicating n-type semiconducting behaviour. The carrier concentration of Zn doped CdS thin films at room temperature are found to be in the range of 10 19-10 20 cm −3 suggesting that the prepared films are degenerate semiconductors. The increase in thermal conductivity of Zn doped CdS thin film is due to the increase in carrier concentration of the films. The lattice thermal conductivity of Zn doped CdS thin films had an inverse temperature dependent and at high temperatures shows the dominance of phonon scattering.

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Structural and optical studies of Zn1−xCdxS quantum dots synthesized by in situ technique in PVA matrix

Cited by 40 publications

References 46 publications

Exploring the interaction of l-cysteine capped CuS nanoparticles with bovine serum albumin (BSA): a spectroscopic study

Exploring the interaction of l-cysteine capped CuS nanoparticles with bovine serum albumin (BSA): a spectroscopic study

Enhancing photoluminescence of carbon quantum dots doped PVA films with randomly dispersed silica microspheres

Structural, surface morphological, optical and thermoelectric properties of sol–gel spin coated Zn doped CdS thin films

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