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Luminescent, freestanding composite films of Au 15 for specific metal ion sensing
Pradeep Thalappil, Shibu E.S, Maliyekkal S.M, Bootharaju M.S, Pradeep T.
Published in
2012
PMID: 22211455
Volume: 4
   
Issue: 2
Pages: 639 - 644
Abstract
A highly luminescent freestanding film composed of the quantum cluster, Au 15, was prepared. We studied the utility of the material for specific metal ion detection. The sensitivity of the red emission of the cluster in the composite to Cu 2+ has been used to make a freestanding metal ion sensor, similar to pH paper. The luminescence of the film was stable when exposed to several other metal ions such as Hg 2+, As 3+, and As 5+. The composite film exhibited visual sensitivity to Cu 2+ up to 1 ppm, which is below the permissible limit (1.3 ppm) in drinking water set by the U.S. environmental protection agency (EPA). The specificity of the film for Cu 2+ sensing may be due to the reduction of Cu 2+ to Cu 1+/Cu 0 by the glutathione ligand or the Au 15 core. Extended stability of the luminescence of the film makes it useful for practical applications. © 2012 American Chemical Society.
About the journal
JournalACS Applied Materials and Interfaces
ISSN19448244
Open AccessNo
Concepts (29)
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    Composite
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    Freestanding films
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    Glutathiones
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    LUMINESCENT FILMS
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    METAL ION DETECTION
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    Metal ion sensing
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    METAL ION SENSORS
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    QUANTUM CLUSTERS
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    RED EMISSIONS
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    SPECIFIC METAL ION SENSING
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    U.S. ENVIRONMENTAL PROTECTION AGENCY
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    VISUAL SENSITIVITY
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    Chitosan
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    Composite films
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    Gold
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    Luminescence
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    Metal ions
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    Copper
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    Arsenic
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    Glutathione
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    Mercury
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    Metal
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    Article
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    Chemistry
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    Quantum theory
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    Water pollutant
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    LUMINESCENT MEASUREMENTS
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    Metals
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    Water pollutants, chemical