George, Anu ; Shibu, E. S. ; Maliyekkal, Shihabudheen M. ; Bootharaju, M. S. ; Pradeep, T. (2012) Luminescent, freestanding composite films of Au15 for specific metal ion sensing ACS Applied Materials & Interfaces, 4 (2). pp. 639-644. ISSN 1944-8244
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Official URL: http://pubs.acs.org/doi/abs/10.1021/am201292a
Related URL: http://dx.doi.org/10.1021/am201292a
Abstract
A highly luminescent freestanding film composed of the quantum cluster, Au15, 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 Cu2+ 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 Hg2+, As3+, and As5+. The composite film exhibited visual sensitivity to Cu2+ 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 Cu2+ sensing may be due to the reduction of Cu2+ to Cu1+/Cu0 by the glutathione ligand or the Au15 core. Extended stability of the luminescence of the film makes it useful for practical applications.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
Keywords: | Au15 Quantum Cluster; Luminescent Films; Composite; Chitosan; Specific Metal Ion Sensing |
ID Code: | 84217 |
Deposited On: | 24 Feb 2012 13:24 |
Last Modified: | 24 Feb 2012 13:24 |
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