Premium
Highly Selective Optical Detection of Fe 3+ Ions in Aqueous Solution Using Label‐Free Silicon Nanocrystals
Author(s) -
Linehan Keith,
Carolan Darragh,
Doyle Hugh
Publication year - 2019
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201900034
Subject(s) - luminescence , detection limit , quenching (fluorescence) , ion , silicon , aqueous solution , ionic bonding , nanocrystal , materials science , analytical chemistry (journal) , analyte , selectivity , chemistry , photochemistry , fluorescence , nanotechnology , optoelectronics , chromatography , optics , organic chemistry , physics , catalysis
High brightness amine‐terminated silicon nanocrystals (Si NCs) have been utilized in a simple and rapid assay for the highly selective and sensitive detection of Fe 3+ via quenching of their strong blue luminescence, without the need for analyte‐specific labeling groups. Sensitive detection of Fe 3+ is successfully demonstrated, with a linear relationship observed between luminescence quenching and Fe 3+ concentration from 5 × 10 −6 to 900 × 10 −6 m and a limit of detection of 1.3 × 10 −6 m . The Si NCs show excellent selectivity toward Fe 3+ ions, with no quenching of the luminescence signal induced by the presence of Fe 2+ ions, allowing for solution phase discrimination between the ionic species in different charge states.