Germanium nanocrystals as luminescent probes for rapid, sensitive and label-free detection of Fe3+ ions

Nanoscale
Darragh Carolan, Hugh Doyle

Abstract

Luminescent water-soluble germanium nanocrystals (Ge NCs) have been developed as a fluorescent sensing platform for the highly selective and sensitive detection of Fe3+ via quenching of their strong blue luminescence, without the need for analyte-specific labelling groups. The amine-terminated Ge NCs were separated into two discrete size fractions with average diameters of 3.9±0.4 nm and 6.8±1.8 nm using centrifugation. The smaller 3.9 nm NCs possessed a strong blue luminescence, with an average lifetime of 6.1 ns and a quantum yield (QY) of 21.5%, which is strongly influenced by solution pH. In contrast, 6.8 nm NCs exhibited a green luminescence with a longer lifetime of 7.8 ns and lower QY (6.2%) that is insensitive to pH. Sensitive detection of Fe3+ was successfully demonstrated, with a linear relationship between luminescence quenching and Fe3+ concentration observed from 0-800 μM, with a limit of detection of 0.83 μM. The Ge NCs show excellent selectivity toward Fe3+ ions, with no quenching of the fluorescence signal induced by the presence of Fe2+ ions, allowing for solution phase discrimination between ions of the same element with different formal charges. The luminescence quenching mechanism was confirmed by static and...Continue Reading

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Citations

Jul 4, 2015·Chemical Communications : Chem Comm·M KlingerA-N Unterreiner
May 10, 2017·ACS Applied Materials & Interfaces·Tingyi GuCraig B Arnold
Jan 14, 2017·Physical Chemistry Chemical Physics : PCCP·John A McLeodLijia Liu

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