Parallel factor analysis of EEM of the fluorescence of carbon dots nanoparticles

Authors

  • João M. M. Leitão,

    1. Laboratório de Métodos Instrumentais de Análise, Faculdade de Farmácia da Universidade de Coimbra, Centro de Estudos Farmacêuticos, Coimbra 3000-432, Portugal
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  • Helena Gonçalves,

    1. Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre 687, Porto 4169-007, Portugal
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  • Joaquim C. G. Esteves da Silva

    Corresponding author
    1. Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre 687, Porto 4169-007, Portugal
    • Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre 687, Porto 4169-007, Portugal
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Abstract

The effect of experimental factors [pH and Hg(II)] on the fluorescence excitation emission matrices (EEMs) of nanosensor carbon dots (CDs) was analyzed by multiway decomposition methods based on parallel factor (PARAFAC) analysis. PARAFAC analysis of the EEM structures identifies three components corresponding to two different-sized CDs with the Hg(II) and pH profiles highly correlated plus a background. Parallel profiles with Linear Dependences (PARALIND) model with three components in the excitation–emission spectral modes and two components in the Hg(II) or pH mode gave similar results as PARAFAC, but is more useful from a theoretical point of view because PARALIND shows that the two different-sized CDs have similar chemical reactivity toward Hg(II) and pH. PARAFAC2 was used as a trilinear confirmatory test of the data structures under analysis. Copyright © 2010 John Wiley & Sons, Ltd.

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