Morphology–structure diversity of ZnS nanostructures and their optical properties

Zhang, Yuanpeng; Liu, Wei; Liu, Baodan; Wang, Rongming

doi:10.1007/s12598-013-0217-8

Cited by 26 publications

(15 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The line and plane defects cannot participate in emission processes due to the lack of the quantum confinement effects [30]. Therefore, the presence of emission centers activated in Pristine-ZnS NPs probably originates only from point defects such as Scottky defects (vacancy states) and Frenkel defects (interstitial states) [12,30]. Zinc interstitial atoms and sulfur vacancies lie in the ZnS forbidden gap and close to the conduction band to act as donor energy states.…”

Section: Photoluminescence (Pl) Spectroscopymentioning

confidence: 99%

Facile synthesis of ZnS–Ag2S core–shell nanospheres with enhanced nonlinear refraction

Haghighatzadeh

Kiani

Mazinani

et al. 2019

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

ZnS-Ag 2 S core-shell nano/hetero-junctions have been synthesized by a two-step co-precipitation technique, in which thin layers of Ag 2 S have been successfully coated on the surface of ZnS nanospheres. Structural studies and elemental analysis have been performed using X-ray diffraction, Fourier transfer infrared spectroscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, and high-resolution transmission electron microscopy. UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy have been employed to investigate linear optical characteristics. Nanosecond laser pulsed-based single-beam Z-scan analysis has been used to examine the magnitude and the sign of the third-order nonlinear refractive indices. Samples show negative values of nonlinear refractive indices indicating self-defocusing optical nonlinearity under 1064 nm excitation. The results have shown that the third-order nonlinear refractive index in ZnS nanospheres can reach the magnitude of 61.0 × 10 −12 m 2 ∕W by encapsulating such a nanostructure within nanometer shells of Ag 2 S. The enhanced nonlinearity for ZnS-Ag 2 S core-shells has been found to be 9 times higher than sole ZnS nanoparticles, which was estimated to be about 6.4 × 10 −12 m 2 ∕W.

show abstract

Section: Photoluminescence (Pl) Spectroscopymentioning

confidence: 99%

Facile synthesis of ZnS–Ag2S core–shell nanospheres with enhanced nonlinear refraction

Haghighatzadeh

Kiani

Mazinani

et al. 2019

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…The main reason is the lack of sulfur vacancies that causes the photoexcited electrons in CdS. So, the weak PL emission is due to the lack of luminescence centers in nanoparticles' structure [35]. Also, it was found that increasing the ratio of Cd 2+ ion in nanoparticles' structure results in increasing the sulfur vacancies and results in PL increment in bare CdS nanoparticles.…”

Section: Luminescence Mechanism In Bare Cds and Mn-doped Cds Nanopartmentioning

confidence: 99%

A Novel Thermochemical Method for Fabrication and Theoretical Explanation of High Luminescent Mn-Doped CdS Nanoparticles

Darvishi¹,

Nikfarjam²

2018

MSCE

View full text Add to dashboard Cite

In this paper, fabrication and characterization of bare and doped CdS nanoparticles as well as investigating the luminescence properties of these particles as an important II-VI semiconductor are presented. A novel Thermochemical method was used for synthesis of these quantum dots. Thiols were used as the capping agent to prevent further growth during fabrication process. The application of TGA as a capping agent instead of TG was studied as a novel idea in this paper and was used practically in the synthesis of semiconductor nanoparticles. Using this process resulted in particles with sizes between 3 -7 nm. Several samples were synthesized and characterized under various Mn ions doping ratio from 1:10 to 1:180, different temperatures from 40˚C to 96˚C and different pH values from 6 to 10. Synthesis of CdS nanoparticles with high Mn ions concentration resulted in luminescence decrement, while luminescence of nanoparticles was increased by decreasing Mn/Cd doping ratio until Mn:Cd = 1:180. The best fabrication temperature was obtained at 96˚C and the highest luminescence was observed at the pH value of 9. A theoretical explanation for the behavior of fabricated high luminescent quantum dots is presented based on the principles of quantum mechanics. Among semiconductor nano-materials, CdS nanoparticles have attracted considerable attention due to their unique properties, which do not present in their bulk materials [2]. These unique properties introduce them as the important and useful materials for various applications such as solar cells, photodetectors, light-emitting diodes, photoelectrolysis and biological labels [3] [4] [5] [6].Nanoparticles have been grown in a variety of ways, namely precipitation in the solid phase [7] [8], using porous materials as templates [9], growth in nano-sized micelles and precipitation in the liquid phase [10] [11].

show abstract

“…Nanostructured semiconductors of group II-VI are important materials because of their potential applications in various fields such as in gas sensors, imaging, solar cells, photoconductors, biological detection, UV sensors, short-wavelength laser diodes and various luminescence devices [1][2][3]. Nanostructured CdS and ZnS films are extensively used in various optoelectronic devices and photoconducting cells [4,5]. CdZnS has potential applications in blue, UV diode lasers and in high-density optical recording based on the structure of CdZnS, whose fundamental absorption edges may vary from green to UV [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study of structural and optical properties of chemically synthesized nanostructured cadmium zinc sulphide films for band gap tunability

Mochahari

Sarma

2015

Indian J Phys

View full text Add to dashboard Cite

Nanostructured cadmium zinc sulphide films have been deposited onto cleaned glass substrates by chemical bath deposition method at room temperature using polyvinyl alcohol as capping agent. X-ray diffraction analysis confirms the formation of cubic-phase cadmium zinc sulphide films. Crystallite size obtained from the calculation of Scherrer's formula and Williamson-Hall plot as well as size-strain plot is found to decrease with the increase in zinc concentration. The films have very high dislocation density of the order of 10 16 m -2 , whereas the strain is of the order of 10 -3 . Scanning electron microscopic image reveals that the particles are agglomerated to form nanoclusters and energy-dispersive X-ray analysis confirms that films are composed of cadmium, zinc and sulphur. High-resolution transmission electron microscopic image reveals that the shape of the particles is nearly spherical, uniformly distributed. Selected-area electron diffraction pattern supports the formation of cubic phase of the film. Optical absorption peaks of the films shift towards lower wavelength side and their optical band gap increases with the increase in zinc concentration. The increase in zinc concentration enhances the photoluminescence emission intensity, whose emission is in the green region of visible spectrum.

show abstract

Morphology–structure diversity of ZnS nanostructures and their optical properties

Cited by 26 publications

References 89 publications

Facile synthesis of ZnS–Ag2S core–shell nanospheres with enhanced nonlinear refraction

Facile synthesis of ZnS–Ag2S core–shell nanospheres with enhanced nonlinear refraction

A Novel Thermochemical Method for Fabrication and Theoretical Explanation of High Luminescent Mn-Doped CdS Nanoparticles

Study of structural and optical properties of chemically synthesized nanostructured cadmium zinc sulphide films for band gap tunability

Contact Info

Product

Resources

About