Thiol-capped CdTe quantum dots hosted in saponites

Elena Pérez-Barrado; Lluís F. Marsal; Magdalena Aguiló; Yolanda Cesteros; Francesc Díaz; Josep Pallarès; Fabio Cucinotta; Leonardo Marchese; Maria Cinta Pujol; Pilar Salagre

doi:10.1039/C6RA21225E

Thiol-capped CdTe quantum dots hosted in saponites

Elena Pérez-Barrado,

†^abc Lluís F. Marsal,^c Magdalena Aguiló,^b Yolanda Cesteros,^a Francesc Díaz,^b Josep Pallarès,^c Fabio Cucinotta,‡^d Leonardo Marchese,^d Maria Cinta Pujol^b and Pilar Salagre*^a

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^a Dept. Química Física i Inorgànica, EMAS, Univ. Rovira i Virgili (URV), Marcel lí Domingo 1, E-43007 Tarragona, Spain
E-mail: pilar.salagre@urv.cat

^b Física i Cristal lografia de Materials i Nanomaterials (FICMA-FiCNA), EMAS, Univ. Rovira i Virgili (URV), Marcel lí Domingo 1, E-43007 Tarragona, Spain

^c Dept. d'Enginyeria Electrònica, Elèctrica i Automàtica, EMAS, Univ. Rovira i Virgili (URV), Avda. Països Catalans 26, E-43007 Tarragona, Spain

^d Dipartimento di Scienze e Tecnologie Avanzate, Centro Interdisciplinare Nano-Sistemi, Università del Piemonte Orientale “Amedeo Avogadro”, Viale T. Michel 11, 15121 Alessandria, Italy

Abstract

Composite materials were easily prepared based on saponites where thiol-capped CdTe quantum dots (QDs) were hosted. A saponite was exchanged with a cationic polyelectrolyte solution of poly(diallyldimethylammonium chloride) (PDDA) and the thiol-capped QDs. Two composites based on delaminated saponites, a cationic polyelectrolyte and CdTe QDs were also prepared by spin-coating on a glass support. The presence of the QDs hosted in the inorganic matrices was tested by FT-IR and optical luminescence measurements. Additionally, a light-emitting diode was assembled and its I–V electrical characteristics are presented. Transition from ohmic behaviour to space charge limited conduction appeared at a turn-on voltage of 5.2 V.

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Thiol-capped CdTe quantum dots hosted in saponites

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