Electrophoretic deposition of CdSe/ZnS/PVP nanocomposite
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MÎRZAC, Alexandra, GUTSUL, Tatiana, ZUBAREVA, Vera, BULHAK, Ion. Electrophoretic deposition of CdSe/ZnS/PVP nanocomposite. In: Physical Methods in Coordination and Supramolecular Chemistry, 8-9 octombrie 2015, Chişinău. Chisinau, Republic of Moldova: 2015, XVIII, p. 105.
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Physical Methods in Coordination and Supramolecular Chemistry
XVIII, 2015
Conferința ""Physical Methods in Coordination and Supramolecular Chemistry""
Chişinău, Moldova, 8-9 octombrie 2015

Electrophoretic deposition of CdSe/ZnS/PVP nanocomposite


Pag. 105-105

Mîrzac Alexandra1, Gutsul Tatiana2, Zubareva Vera1, Bulhak Ion1
 
1 Institute of Chemistry,
2 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu"
 
Disponibil în IBN: 21 aprilie 2020


Rezumat

Inorganic semiconductor nanocrystals posses superior light absorption, exceptional photoluminescence (PL) efficiency, high photostability, and a small exciton binding energy. High-quality semiconductor nanocrystals are usually synthesized by colloidal routes in coordinating solvents. The as-synthesized nanocrystals with hydrophobic groups on their surfaces are insoluble in strong polar solvents [1]. Ligand exchange process can transfer nanocrystals into polar solvents, it often generates surface defect sites that cause nonradiative exciton recombination. Polyvinylpyrrolidone (PVP) is usually served as a stabilizer of nanopartciles as the building blocks exhibit good compatibility with many inorganic, organic, and biological materials. The Electrophoretic Deposition (EPD) of quantum dot thin films is accomplished by applying a voltage between two conductive electrodes that are suspended in a colloidal quantum dot solution. The electric field established between the electrodes drives quantum dot deposition onto the electrodes. EPD allows parallel processing, as well, it enables deposition of films onto the electrodes of arbitrary geometry [2]. We synthesized CdSe/ZnS nanoparticles according to methods described in [3] and [4]. The amount of CdSe/ZnS nanoparticles was dissolved in hexane. In our research, we used a suspension of CdSe/ZnS nanoparticles, dissolved in a solvent: isopropanol, acetyl-acetone and PVP, dispersed in ultrasound bath. After, the suspension of core-shell nanoparticles was placed into an EPD cell, supplied with 2 metallic electrodes placed at 8 mm distance from each other. It was applied alternating current of 100 Hz frequency, 600 V – amplitude. We used a glass electrode covered with In2O3-SnO2 layer (ITO), also a platinum electrode. Photoluminiscence spectra of CdSe/ZnS/PVP nanocomposite shows maximum at E = 2,15 eV (λ=571 nm), measured at T = 300 K. Thus, the experimental results prove that CdSe/ZnS/PVP nanocomposite is transparent and has luminiscent properties.Fig. 1. Photoluminiscence spectra of nanoparticles CdSe/ZnS and nanocomposite CdSe/ZnS/PVP.