Please use this identifier to cite or link to this item: http://hdl.handle.net/10216/94598
Author(s): Manuel Algarra
Iulius Bobos
Jose Jimenez Jimenez
Ramon Morento Tost
Enrique Rodriguez Castellon
Joaquim C G E Esteves da Silva
Title: Porous phosphate heterostructures containing CdS quantum dots: assembly, characterization and photoluminescence
Issue Date: 2010
Abstract: The synthesis and characterization of cadmium sulphide (CdS) quantum dots, conjugated in a porous phosphate heterostructure functionalized with aminopropyl groups is described. The resulting material has fluorescence properties with maximum emission intensity at 575 nm. The fluorescent materials are not soluble in water and exhibit high stability in aqueous solution in the pH ranges from 2 to 9. Energy dispersive X-ray spectroscopy confirmed the qualitative elemental composition of the synthesized materials and X-ray photoelectron spectra showed a surface S/Cd atomic ratio of 1.09. SEM images show that the materials are amorphous, possessing porous with sizes of several tens nanometres, homogeneous and exhibit a layered morphology. The adsorption-desorption analysis by N(2) at 77 K showed the accessibility of the CdS quantum dots onto the pores of the structure. The CdS quantum dots were stabilized by mercaptopropionic acid and bounded to the host materials by amine groups.
Subject: Química
Chemical sciences
URI: http://hdl.handle.net/10216/94598
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional

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