Chemometric Analysis of Excitation Emission Matrices of Fluorescent Nanocomposites

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Joao M M Leitao (Autor) Outra; Roma Tauler (Autor) Outra; Joaquim C G E Esteves da Silva (Autor) FCUP

Revista

Título: Journal of Fluorescence

Vol. 21

Páginas: 1987-1996

ISSN: 1053-0509

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 9 Citações

Scopus - 10 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-002-MS8

DOI: 10.1007/s10895-011-0899-y

Abstract (EN): The performance of multivariate curve resolution (MCR-ALS) to decompose sets of excitation emission matrices of fluorescence (EEM) of nanocomposite materials used as analytical sensors was assessed. The two fluorescent nanocomposite materials were: NH(2)-polyethylene glycol (PEG200) functionalized carbon dots, sensible to aqueous Hg(II) (CD); and, CdS quantum dots attached to the dendrimer DAB, sensible to the ionic strength of the aqueous medium (CdS-DAB). The structures of these sets of EEM, obtained as function of the Hg(II) concentration and ionic strength, are characterized by collinear properties (CD) and non-linear spectral variations (CdS-DAB). MCR-ALS was able to detect that the source of the collinearities is the presence of different size CD that show similar affinity towards Hg(II). Moreover, MCR-ALS was able to model the non-linear spectral variations of the CdS-DAB that are induced by varying ionic strength. The chemometric preprocessing of the fluorescent data sets using soft-modelling multivariate curve resolution like MCR-ALS is a critical step to transform these nanocomposites with interesting fluorescent proprieties into analytical useful nanosensors.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10