Photoluminescence behavior in the synthesized CdSe thin films deposited on ITO substrates

Smida, A.; Zaâboub, Z.; Mohamed, Naim Bel Haj; Hassen, M.; Laatar, Fakher; Maâref, H.; Ezzaouia, Hatem

doi:10.1016/j.jlumin.2017.09.036

Cited by 22 publications

(10 citation statements)

References 42 publications

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“…82 51,83 and comparable to those of analogous previously reported films (Table S2 and references therein, ESI †). 6,22,45,[84][85][86][87][88][89] As expected, E g values of ternary thin films, 3F and 5F, were slightly higher than those of bulk MSe band gaps due to partial substitution of Se 2À with S 2À anions in the lattice. Additionally, sub-bandgap absorptions were observed in cadmium thin films.…”

Section: àsupporting

confidence: 75%

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Aerosol-assisted chemical vapor deposition of MSe and MSSe thin films using zinc(ii) and cadmium(ii) single source precursors containing hybrid Se,X-PNC ligands

García-Guzmán,

Flores-Romero,

Rojas-Montoya

et al. 2023

New J. Chem.

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Section: àsupporting

confidence: 75%

“…This absorption may arise due to the surface state induced by impurities. 85,90 As seen, it could be only observed in crystalline films. 91 E g values of annealed films are plotted in Fig.…”

Section: Thin Filmsmentioning

confidence: 80%

Aerosol-assisted chemical vapor deposition of MSe and MSSe thin films using zinc(ii) and cadmium(ii) single source precursors containing hybrid Se,X-PNC ligands

García-Guzmán,

Flores-Romero,

Rojas-Montoya

et al. 2023

New J. Chem.

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show abstract

“…Where d is the path length of thequartz cuvette and A is the absorbance determined fromthe UV-Visible spectrum. The band gap energy values can be determinedby extrapolation of the linear part of (αhν) 2 versus hν, see Figure 5.b.The line intersection with the x-axis corresponded to the value of the optical gap energy.The estimated band-gap energy of CdSe-MSA nanocrystals increased from 1.74 to 2.4 eV, which was due to the quantum confinement effects induced by the nanosized crystallites in CdSe semiconductors, subsequent in more discrete energy spectra (Smida et al 2018).This result indicated that the CdSe-MSA had a suitable band gap for photocatalytic decomposition of organic contaminants under visiblelight irradiation.…”

Section: Photocatalyst Characterizationmentioning

confidence: 93%

Adsorption and Photocatalytic Degradation of an Industrial Azo Dye Using Colloidal Semiconductor Nanocrystals

Mohamed

Ouni

Bouzid

et al. 2021

Preprint

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In this study, mercaptosuccinic acid capped CdSe nanocrystals was successfully synthesized by in-situ medium colloid and used as photocatalyst for the effective photodegradation of methylene blue from aqueous solution under visible light and sunlight irradiations.The particle size and the crystal structure of these nanocrystals were analyzed by different analytical techniques. Dye adsorption prior to photocatalysis using these nanomaterials was studied via the experimental quantification of kinetics and isotherms. These experimental data were modeled including the application of statistical physics theory to analyze the corresponding adsorption mechanism. A maximum adsorption capacity of 27.1 mg/g (80% dye removal) was observed in 10 min using an initial concentration of 30 mg/L. Statistical physics calculations indicated that the adsorption energy was lower than 40 kJ/mol. Itwas also established that the dye adsorption was associated to the electrostatic interactions and hydrogen bonding. Overall, the dye removal was a spontaneous, feasible process and exothermic. Adsorption properties of CdSe-MSA nanocrystals improved the dye photodegradation efficiency under visible light thus achieving up to 80% degradation in 60 min. The synergic effect of adsorption and photocatalytic degradation performance was mainly due to the surface area, small size (3.7 nm) and structural defects (selenium vacancies Se, interstitial of cadmium ICd), which enhanced the response of these nanomaterials inside the visible range for the photocatalytic activity. In summary, these nanocrystals are promising materials to be used in wastewater treatment under sun light for the removal of organic compounds like dyes.

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“…The band gap energy values can be determined by extrapolation of the linear part of (αhν) 2 versus hν, see Figure 5.b.The line intersection with the x-axis corresponded to the value of the optical gap energy. The estimated band-gap energy of CdSe-MSA nanocrystals increased from 1.74 to 2.4 eV, which was due to the quantum confinement effects induced by the nanosized crystallites in CdSe semiconductors, subsequent in more discrete energy spectra(Smida et al 2018).This result indicated that the CdSe-MSA had a suitable band gap for photocatalytic decomposition of organic contaminants under visiblelight irradiation.The exciton peak position can be converted into the corresponding particle size of nanocrystals using the next empirical expressions(Bacherikov et al 2006):…”

mentioning

confidence: 93%

Adsorption and photocatalytic degradation of an industrial azo dye using colloidal semiconductor nanocrystals

Mohamed

Ouni

Bouzid

et al. 2022

Preprint

View full text Add to dashboard Cite

In this study, mercaptosuccinic acid capped CdSe nanocrystals was successfully synthesized by in-situ medium colloid and used as photocatalyst for the effective photodegradation of methylene blue from aqueous solution under visible light and sunlight irradiations. The particle size and the crystal structure of these nanocrystals were analyzed by different analytical techniques. Dye adsorption prior to photocatalysis using these nanomaterials was studied via the experimental quantification of kinetics and isotherms. These experimental data were modeled including the application of statistical physics theory to analyze the corresponding adsorption mechanism. A maximum adsorption capacity of 27.1 mg/g (80% of dye removal) was observed in 10 min using an initial concentration of 30 mg/L. Statistical physics calculations indicated that the adsorption energy was lower than 40 kJ/mol. It was also established that the dye adsorption was associated to the electrostatic interactions and hydrogen bonding. Overall, the dye removal was a spontaneous, feasible and exothermic process. Adsorption properties of CdSe-MSA nanocrystals improved the dye photodegradation efficiency under visible light thus achieving up to 80% degradation in 60 min. The synergic effect of adsorption and photocatalytic degradation performance was mainly due to the surface area, small size (3.7 nm) and structural defects (selenium vacancies Se, interstitial of cadmium ICd) of nanocrystals, which enhanced the response of these nanomaterials inside the visible range for the photocatalytic activity. In summary, these nanocrystals are promising materials to be used in wastewater treatment under sunlight for the removal of organic compounds like dyes.

show abstract

Photoluminescence behavior in the synthesized CdSe thin films deposited on ITO substrates

Cited by 22 publications

References 42 publications

Aerosol-assisted chemical vapor deposition of MSe and MSSe thin films using zinc(ii) and cadmium(ii) single source precursors containing hybrid Se,X-PNC ligands

Aerosol-assisted chemical vapor deposition of MSe and MSSe thin films using zinc(ii) and cadmium(ii) single source precursors containing hybrid Se,X-PNC ligands

Adsorption and Photocatalytic Degradation of an Industrial Azo Dye Using Colloidal Semiconductor Nanocrystals

Adsorption and photocatalytic degradation of an industrial azo dye using colloidal semiconductor nanocrystals

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