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Effect of Surface Passivation on CdxNi1-xS Thin Films Embedded with Nickel Nanoparticles

100%
Mosiori C. O.
Path of Science
|
2017
|
vol. 3
|
issue 8
3001-3010
EN
Certain treatments done to binary CdS, such as incorporating Ni onto CdS produces ternary thin films may cause major optical parameters that have a number of applications including for solar cell device fabrication. In this paper, we report on the effect of surface passivation on the band gap and other related optical properties of CdNiS thin films. Thin films for CdxNi1-xS were prepared on glass substrates by chemical solution method. Effects of surface passivation and variation of the volume of nickel ions on the optical properties CdS hence obtaining CdxNi1-xS thin films was investigated. It was observed that the thin films hard an average Transmittance above 68 %, with reflectance below 25 % across UV-VIS-NIR region. A plot of (αhν) 2 versus hν gave energy band gap between 2.55–3.49 eV for as-grown samples and 2.82–3.50 eV for annealed samples. The passivated samples had band gap energy values within the range 2.85–3.12 eV. It was concluded that an increase in concentration of Cd2+ and Ni2+ ions in the reaction led to an increase the band gap while optical conductivity ranged between 3.78 1011–2.40 1012 S-1.
2

Authenticity Tests of White Wines From the Apold Depression

100%
Lengyel E., Sikolya L.
Management of Sustainable Development
|
2014
|
vol. 6
|
issue 2
55-59
EN
This paper aims at establishing distinctive elements regarding the authenticity of the following wines from the Apold vineyard: Sauvignon blanc, Fetească regală and Chardonnay. The paper aims at reviewing the color-giving components specific to white wines. Thus, through HPLC methods, we identified and quantified phenolic compounds which, in the end, presented total values between 86.085 mg/L and 89.272 mg/L. The present study also demonstrates the authenticity of these wines through spectrophotometric methods employed to determine the color of white wines. Based on the results obtained, we established that the studied wines are authentic, as the values resulted from the calculations in the procedure range between 0.015 and 0.019.
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