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CdSe/TiO2 core-shell nanoparticles produced in AOT reverse micelles: applications in pollutant photodegradation using visible light.

Fontes Garcia AM, Fernandes MS, Coutinho PJ - Nanoscale Res Lett (2011)

Bottom Line: CdSe quantum dots with a prominent band-edge photoluminescence were obtained by a soft AOT water-in-oil (w/o) microemulsion templating method with an estimated size of 2.7 nm.The CdSe particles were covered with a TiO2 layer using an intermediate SiO2 coupling reagent by a sol-gel process.The resulting CdSe/TiO2 core/shell nanoparticles showed appreciable photocatalytic activity at λ = 405 nm which can only originate because of electron injection from the conduction band of CdSe to that of TiO2.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. pcoutinho@fisica.uminho.pt.

ABSTRACT
CdSe quantum dots with a prominent band-edge photoluminescence were obtained by a soft AOT water-in-oil (w/o) microemulsion templating method with an estimated size of 2.7 nm. The CdSe particles were covered with a TiO2 layer using an intermediate SiO2 coupling reagent by a sol-gel process. The resulting CdSe/TiO2 core/shell nanoparticles showed appreciable photocatalytic activity at λ = 405 nm which can only originate because of electron injection from the conduction band of CdSe to that of TiO2.

No MeSH data available.


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Absorption and PL spectra of CdSe QDs.
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Figure 2: Absorption and PL spectra of CdSe QDs.

Mentions: For the preparation of CdSe QDs, we have used AOT reverse micelles templating procedure, and cadmium nitrate and polyselenide as precursors. The nucleation and growth processes proceed in the water pools, and the resulting particles are probably stabilized by non-covalent surface covering with AOT surfactant molecules. The particle's surface can thus be easily changed, either by adding other molecules that covalently bind to the particles surface displacing the surfactant (capping/functionalization agents), or by growing layers of other materials above the CdSe nanoparticles that can function as nucleation seeds. A more detailed study of the factors that determine the size distribution and quality of the CdSe QDs prepared via polyselenide precursors has been published previously (Fontes Garcia AM, Coutinho PJG: "Production of CdSe Quantum Dots using polyselenide in AOT reverse micelles", submitted). In Figure 2 the absorption, PL and PL excitation (PLE) spectra of CdSe QDs are shown.


CdSe/TiO2 core-shell nanoparticles produced in AOT reverse micelles: applications in pollutant photodegradation using visible light.

Fontes Garcia AM, Fernandes MS, Coutinho PJ - Nanoscale Res Lett (2011)

Absorption and PL spectra of CdSe QDs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211843&req=5

Figure 2: Absorption and PL spectra of CdSe QDs.
Mentions: For the preparation of CdSe QDs, we have used AOT reverse micelles templating procedure, and cadmium nitrate and polyselenide as precursors. The nucleation and growth processes proceed in the water pools, and the resulting particles are probably stabilized by non-covalent surface covering with AOT surfactant molecules. The particle's surface can thus be easily changed, either by adding other molecules that covalently bind to the particles surface displacing the surfactant (capping/functionalization agents), or by growing layers of other materials above the CdSe nanoparticles that can function as nucleation seeds. A more detailed study of the factors that determine the size distribution and quality of the CdSe QDs prepared via polyselenide precursors has been published previously (Fontes Garcia AM, Coutinho PJG: "Production of CdSe Quantum Dots using polyselenide in AOT reverse micelles", submitted). In Figure 2 the absorption, PL and PL excitation (PLE) spectra of CdSe QDs are shown.

Bottom Line: CdSe quantum dots with a prominent band-edge photoluminescence were obtained by a soft AOT water-in-oil (w/o) microemulsion templating method with an estimated size of 2.7 nm.The CdSe particles were covered with a TiO2 layer using an intermediate SiO2 coupling reagent by a sol-gel process.The resulting CdSe/TiO2 core/shell nanoparticles showed appreciable photocatalytic activity at λ = 405 nm which can only originate because of electron injection from the conduction band of CdSe to that of TiO2.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. pcoutinho@fisica.uminho.pt.

ABSTRACT
CdSe quantum dots with a prominent band-edge photoluminescence were obtained by a soft AOT water-in-oil (w/o) microemulsion templating method with an estimated size of 2.7 nm. The CdSe particles were covered with a TiO2 layer using an intermediate SiO2 coupling reagent by a sol-gel process. The resulting CdSe/TiO2 core/shell nanoparticles showed appreciable photocatalytic activity at λ = 405 nm which can only originate because of electron injection from the conduction band of CdSe to that of TiO2.

No MeSH data available.


Related in: MedlinePlus