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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

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

Revista

Título: Talanta

Vol. 144

Páginas: 862-867

ISSN: 0039-9140

Editora: Elsevier

Indexação

ISI Web of Knowledge - 41 Citações

Scopus - 44 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6