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Issue 11, 2011
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Determination of the size of quantum dots by fluorescence spectroscopy

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Abstract

There has been a lack of quick, simple and reliable methods for determination of nanoparticle size. An investigation of the size of hydrophobic (CdSe) and hydrophilic (CdSe/ZnS) quantum dots was performed by using the maximum position of the corresponding fluorescence spectrum. It has been found that fluorescence spectroscopy is a simple and reliable methodology to estimate the size of both quantum dot types. For a given solution, the homogeneity of the size of quantum dots is correlated to the relationship between the fluorescence maximum position (FMP) and the quantum dot size. This methodology can be extended to the other fluorescent nanoparticles. The employment of evolving factor analysis and multivariate curve resolution-alternating least squares for decomposition of the series of quantum dots fluorescence spectra recorded by a specific measuring procedure reveals the number of quantum dot fractions having different diameters. The size of the quantum dots in a particular group is defined by the FMP of the corresponding component in the decomposed spectrum. These results show that a combination of the fluorescence and appropriate statistical method for decomposition of the emission spectra of nanoparticles may be a quick and trusted method for the screening of the inhomogeneity of their solution.

Graphical abstract: Determination of the size of quantum dots by fluorescence spectroscopy

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Publication details

The article was received on 15 Oct 2010, accepted on 22 Mar 2011 and first published on 14 Apr 2011


Article type: Paper
DOI: 10.1039/C0AN00802H
Citation: Analyst, 2011,136, 2391-2396
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    Determination of the size of quantum dots by fluorescence spectroscopy

    D. Mutavdžić, J. Xu, G. Thakur, R. Triulzi, S. Kasas, M. Jeremić, R. Leblanc and K. Radotić, Analyst, 2011, 136, 2391
    DOI: 10.1039/C0AN00802H

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