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Open Access Nano Express

Growth kinetics of MPS-capped CdS quantum dots in self-assembled thin films

Kenan Koç1*, Fatma Z Tepehan2 and Galip G Tepehan3

Author affiliations

1 Department of Physics, Yildiz Technical University, Esenler, Istanbul, 34220, Turkey

2 Department of Physics, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey

3 Faculty of Arts and Sciences, Kadir Has University, Fatih, Istanbul, 34083, Turkey

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Citation and License

Nanoscale Research Letters 2012, 7:610  doi:10.1186/1556-276X-7-610

Published: 5 November 2012

Abstract

For this study, we prepared colloidal CdS quantum dots using 3-mercaptopropyltrimethoxysilane as capping agent. Colloidal CdS quantum dots were directly deposited on glass substrates by a spin-coating process. Coated substrates were heat-treated between 225°C and 325°C for various heat treatment time intervals to investigate the growth kinetics of the quantum dots. Results showed that sizes of the CdS quantum dots grew approximately from 2.9 to 4.6 nm, and the E1s1s energy values shifted approximately from 3.3 to 2.7 eV. Results showed that the average size of quantum dots increase by thermal treatment due to Ostwald ripening. The thermal process used to grow the size of quantum dots was examined according to the Lifshitz-Slyozov-Wagner theory. The activation energy of CdS quantum dots in thin films was calculated at approximately 44 kJ/mol.

Keywords:
CdS quantum dots; 3-Mercaptopropyltrimethoxysilane; Growth kinetics; Ostwald ripening; Thin films; 81.07.Ta; 81.16.Dn; 65.80.-g