Fluorescent sensor for Cr(VI) based in functionalized silicon quantum dots with dendrimers

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Campos, BB (Author) Other; Algarra, M (Author) Other; Alonso, B (Author) Other; Casado, CM (Author) Other; Jimenez Jimenez, J (Author) Other; Rodriguez Castellon, E (Author) Other; Joaquim C G E Esteves da Silva (Author) FCUP

Journal

Title: Talanta

Vol. 144

Pages: 862-867

ISSN: 0039-9140

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 41 Citations

Scopus - 44 Citations

Other information

Authenticus ID: P-00G-E5A

DOI: 10.1016/j.talanta.2015.07.038

Abstract (EN): Highly luminescent nanoparticles based in Silicon quantum dots, coated by hydroxyl PAMAM dendrimer (PAMAM-OH) of 5th generation, were obtained by one step process by hydrothermal treatment of 3-Aminopropyl)triethoxysilane (APTES) in aqueous solution. Previous to the optimization of the synthesis procedure, different dendritic molecules of 5th generation were tested to obtain the most intense fluorescence signal. The influence of different parameters such ratio APTES/PAMAM-OH, pH and ionic strength on the fluorescence intensity was studied. The fluorescence spectra showed maximum excitation and emission wavelengths at 370 and 446 nm, respectively. The obtained silicon nanoparticles (SiQDs@PAMAM-OH) were characterized by TEM, DLS and XPS, and were found to detect selectively Cr (VI) in aqueous solutions at 2.7 mu M level of detection, sensitivity of 0.2 mu M with a RSD of 0.16% (n=10). To study the feasibility of the proposed system for Cr(VI) detection, it was tested in real electrochemical solution bath and a tanning effluent obtained from electrochemical industry and with two certified waters, demonstrating promising outcomes as nano-sensor.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6