Chemometric Analysis of Excitation Emission Matrices of Fluorescent Nanocomposites

• Type: Article in International Scientific Journal
• Date: 2011

Authors

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

Journal

Title: Journal of Fluorescence

Vol. 21

Pages: 1987-1996

ISSN: 1053-0509

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 10 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10