Study of photocatalytic activity of Zn.sub.x./sub.Cd.sub.1-x./sub.S quantum dots in dependence on their composition using methylene blue

0486601 - FZÚ 2018 RIV CZ eng C - Conference Paper (international conference)
Praus, P. - Svoboda, L. - Hospodková, Alice - Mamulová Kutláková, K.
Study of photocatalytic activity of Zn_xCd_1-xS quantum dots in dependence on their composition using methylene blue.
NANOCON 2014 Conference Proceedings. Ostrava: Tanger Ltd, 2015 - (Shrbená, J.), s. 136-140. 1st Edition. ISBN 978-80-87294-53-6.
[International Conference NANOCON /6./. Brno (CZ), 05.11.2014-07.11.2014]
Institutional support: RVO:68378271
Keywords : quantum dots * ZnCdS * photocatalysis * UV-VIS absorption * x-ray diffraction
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

ZnCdS quantum dots (QDs) with the different composition were prepared by precipitation of zinc and cadmium acetates with sodium sulphide in the presence of cetyltrimethylammonium bromide (CTAB) used for stabilization of their aqueous colloid dispersions. Transition energies of these quantum dots were determined from the UV-VIS spectra of QDs colloid dispersions and consequently used for calculation of the QDs sizes according to the Schrodinger equation. The ZnCdS QDs size was found to be significantly influenced by their composition: the QDs size decreased with the increasing Zn content. The photocatalytic activity of the ZnCdS QDs was studied using the methylene blue decomposition under UV irradiation. Different photocatalytic activity depending on the composition x was observed and explained. The maximal photocatalytic activity was achieved for x = 0.6 when the energy of the irradiation photons was still sufficient to generate electron-hole pairs in majority of the QDs and at the same time the photocatalytic surface area was maximal.

Permanent Link: http://hdl.handle.net/11104/0281370