Facile green synthesis of ZnInS quantum dots: temporal evolution of their optical properties and cell viability against normal and cancerous cells

2020 ◽  
Vol 8 (27) ◽  
pp. 9329-9336
Author(s):  
Nkosingiphile Zikalala ◽  
Sundararajan Parani ◽  
Ncediwe Tsolekile ◽  
Oluwatobi S. Oluwafemi
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cell Viability ◽  
Green Synthesis ◽  
Temporal Evolution ◽  
Ultra Violet ◽  
Cancerous Cells

Green synthesis of Zn–In–S quantum dots and their fluorescence under an ultra violet lamp.

Green synthesis of CuInS 2 /ZnS core-shell quantum dots by facile solvothermal route with enhanced optical properties

2018 ◽  
Vol 114 ◽  
pp. 163-172 ◽  
Author(s):  
Shikha Jindal ◽  
Sushama M. Giripunje ◽  
Subhash B. Kondawar ◽  
Pankaj Koinkar
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Green Synthesis ◽  
Core Shell ◽  
Solvothermal Route

Green synthesis of MPA-capped CdTe/CdSe quantum dots at different pH and its effect on the cell viability of fibroblast histiocytoma cells

2017 ◽  
Vol 209 ◽  
pp. 299-302 ◽  
Author(s):  
Vuyelwa Ncapayi ◽  
Sundararajan Parani ◽  
Sandile P. Songca ◽  
Tetsuya Kodama ◽  
Oluwatobi S. Oluwafemi
Keyword(s):  
Quantum Dots ◽  
Cell Viability ◽  
Green Synthesis ◽  
Cdse Quantum Dots

Optical Properties and Radial Breathing Modes Present in Cu Amorphous Quantum Dots Obtained by Green Synthesis

2014 ◽  
Vol 6 (7) ◽  
pp. 580-583 ◽  
Author(s):  
M. Cortez-Valadez ◽  
J.-G. Bocarando-Chacon ◽  
A. R. Hernández-Martínez ◽  
R. Britto Hurtado ◽  
Ramón A. B. Alvarez ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Green Synthesis ◽  
Radial Breathing Modes

Facile and Green Synthesis of CdSe Quantum Dots in Protein Matrix: Tuning of Morphology and Optical Properties

2014 ◽  
Vol 14 (8) ◽  
pp. 5730-5742 ◽  
Author(s):  
M. Ahmed ◽  
A. Guleria ◽  
M. C. Rath ◽  
A. K. Singh ◽  
S. Adhikari ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Green Synthesis ◽  
Cdse Quantum Dots ◽  
Protein Matrix

scholarly journals Synthesis, Characterization and Evaluation of the Cytotoxicity of Ni-Doped Zn(Se,S) Quantum Dots

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Melissa Cruz-Acuña ◽  
Sonia Bailón-Ruiz ◽  
Carlos R. Marti-Figueroa ◽  
Ricardo Cruz-Acuña ◽  
Oscar J. Perales-Pérez
Keyword(s):  
Drug Delivery ◽  
Quantum Dots ◽  
Optical Properties ◽  
Cell Viability ◽  
Zinc Chloride ◽  
Semiconductor Nanocrystals ◽  
Carcinoma Cells ◽  
Biological Applications ◽  
Potential Toxicity ◽  
Light Excitation

Quantum dots (QDs) are semiconductor nanocrystals with desirable optical properties for biological applications, such as bioimaging and drug delivery. However, the potential toxicity of these nanostructures in biological systems limits their application. The present work is focused on the synthesis, characterization, and evaluation of the toxicity of water-stable Ni-doped Zn(Se,S) QDs. Also, the study of nondoped nanostructures was included for comparison purposes. Ni-doped nanostructures were produced from zinc chloride and selenide aqueous solutions in presence of 3-mercaptopropionic acid and Ni molar concentration of 0.001 M. In order to evaluate the potential cytoxicity of these doped nanostructures, human pancreatic carcinoma cells (PANC-1) were used as model. The cell viability was monitored in presence of Ni-doped Zn(Se,S) QDs at concentrations ranging from 0 μg/mL to 500 μg/mL and light excited Ni-doped Zn(Se,S) nanostructures were evaluated at 50 μg/mL. Results suggested that Ni-doped Zn(Se,S) nanostructures were completely safe to PANC-1 when concentrations from 0 μg/mL to 500 μg/mL were used, whereas non-doped nanostructures evidenced toxicity at concentrations higher than 200 μg/mL. Also, Ni-doped Zn(Se,S) QDs under light excitation do not evidence toxicity to PANC-1. These findings suggest strongly that Zn(Se,S) nanostructures doped with nickel could be used in a safe manner in light-driving biological applications and drug delivery.

Optical properties of a thin layer of the Vanadium dioxide at the metal state

2015 ◽  
Vol 9 (1) ◽  
pp. 2303-2310
Author(s):  
Abderrahim Benchaib ◽  
Abdesselam Mdaa ◽  
Izeddine Zorkani ◽  
Anouar Jorio
Keyword(s):  
Optical Properties ◽  
Thin Layer ◽  
Vanadium Dioxide ◽  
Ultra Violet ◽  
Index Of Refraction ◽  
Cost Of Energy ◽  
Infra Red ◽  
Metal State ◽  
The Cost ◽  
Reversible Phase

The vanadium dioxide VO₂ currently became very motivating for the nanotechnologies’ researchers. It makes party of the intelligent materials because these optical properties abruptly change semiconductor state with metal at a critical  temperature θ = 68°C. This transition from reversible phase is carried out from a monoclinical structure characterizing its semiconductor state at low temperature towards the metal state of this material which becomes tétragonal rutile for  θ ˃ 68°C ; it is done during a few nanoseconds. Several studies were made on this material in a massive state and a thin layer. We will simulate by Maple the constant optics of a thin layer of VO₂ thickness z = 82 nm for the metal state according to the energy ω of the incidental photons in the energy interval: 0.001242 ≤ ω(ev) ≤ 6, from the infra-red (I.R) to the ultra-violet (U.V) so as to be able to control the various technological nano applications, like the detectors I.R or the U.V,  the intelligent windows to  increase  the energy efficiency in the buildings in order to save the cost of energy consumption by electric air-conditioning and the paintings containing nano crystals of this material. The constant optics, which we will simulate, is: the index of refraction, the reflectivity, the transmittivity, the coefficient of extinction, the dielectric functions ԑ₁ real part and  ԑ₂  imaginary part of the permittivity complexes ԑ of this material and the coefficient absorption. 

Optical properties of the Vanadium dioxide

2015 ◽  
Vol 8 (2) ◽  
pp. 2148-2155 ◽  
Author(s):  
Abderrahim Benchaib ◽  
Abdesselam Mdaa ◽  
Izeddine Zorkani ◽  
Anouar Jorio
Keyword(s):  
Energy Efficiency ◽  
Optical Properties ◽  
Critical Temperature ◽  
Thin Layer ◽  
Dielectric Function ◽  
Vanadium Dioxide ◽  
Ultra Violet ◽  
Index Of Refraction ◽  
Practical Utility ◽  
Infra Red

The vanadium dioxide is a material thermo chromium which sees its optical properties changing at the time of the transition from the phase of semiconductor state ↔ metal, at a critical temperature of 68°C. The study of the optical properties of a thin layer of VO₂ thickness 82 nm, such as the dielectric function, the index of refraction, the coefficient ofextinction, the absorption’s coefficient, the reflectivity, the transmittivity, in the photonic spectrum of energy ω located inthe interval: 0.001242 ≤ ω (ev) ≤ 6, enables us to control well its practical utility in various applications, like the intelligentpanes, the photovoltaic, paintings for increasing energy efficiency in buildings, detectors of infra-red (I.R) or ultra-violet(U.V). We will make simulations with Maple and compare our results with those of the literature

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