Inclusion of thiol DAB dendrimer/CdSe quantum dots based in a membrane structure: Surface and bulk membrane modification

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Manuel Algarra (Author) Other; Bruno B Campos (Author) Other; Beatriz Alonso (Author) Other; Carmen M Casado (Author) Other; Joaquim C G E Esteves da Silva (Author) FCUP; Juana Benavente (Author) Other

Journal

Title: Electrochimica Acta

Vol. 89

Pages: 652-659

ISSN: 0013-4686

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 9 Citations

ISI Web of Science

Scopus - 10 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

CORDIS: Physical sciences > Chemistry

Other information

Authenticus ID: P-002-0KJ

DOI: 10.1016/j.electacta.2012.10.143

Abstract (EN): The behavior of a fluorescent nanocomposite, obtained by means of a thiol polypropylenimine dendrimer of third generation coated with CdSe quantum dots, and embedded in a hydrophilic cellulosic membrane as support is electrochemically studied in order to evaluate its applicability as a sensor in liquid media. The characterization of the nanocomposite by TEM and EDAX shows uniform nano morphology (size comprised in the range 60-90 nm) and composition, respectively. The analysis of the engineered hybrid cellulose-dendrimer quantum dots material by confocal fluorescence microscopy indicates almost mono-dispersion distribution of the nanocomposite when irradiated under UV light, while its presence on the film surface was determined by X-ray photoelectron spectroscopy. Impedance spectroscopy measurements performed with dry membrane samples show a decrease in the conductivity and dielectric constant of the modified membrane in comparison with the raw support. Electrical changes in the modified film associated to the presence of Cd(II) uptakes from a Cl2Cd solution were also obtained. These results support the possible application of this nanocomposite material as heavy metal sensor in liquid media.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8