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Issue 12, 2012
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Directional surface plasmon-coupled emission of CdTe quantum dots and its application in Hg(II) sensing

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Abstract

We investigated the surface plasmon-coupled emission (SPCE) of CdTe quantum dots (QDs) and developed an SPCE-based quenchometric sensor for Hg(II) ion sensing. CdTe QDs directly synthesized in aqueous solution were attached to a 50 nm-thick Au film through layer-by-layer assembly. The directional emission of the CdTe QDs on the prism side from the surface plasmon coupling was completely p-polarized and observed at a fixed angle of 48.5°, which was consistent with theoretical calculations. An SPCE-based quenchometric sensor for Hg(II) ion sensing was established based on the quenching effect of Hg(II) ions on the fluorescence emission of CdTe QDs. As expected, the SPCE-based sensor enlarged the response range and was more sensitive than that based on free-space detection as a result of the high light-collection efficiency of SPCE. QDs with excellent properties combined with SPCE technology have great potential in detecting analytes at low concentration levels.

Graphical abstract: Directional surface plasmon-coupled emission of CdTe quantum dots and its application in Hg(ii) sensing

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Publication details

The article was received on 27 May 2012, accepted on 24 Aug 2012 and first published on 28 Aug 2012


Article type: Paper
DOI: 10.1039/C2AY25541C
Citation: Anal. Methods, 2012,4, 3956-3960
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    Directional surface plasmon-coupled emission of CdTe quantum dots and its application in Hg(II) sensing

    X. Liu, Q. Liu, S. Cao, W. Cai, Y. Weng, K. Xie and Y. Li, Anal. Methods, 2012, 4, 3956
    DOI: 10.1039/C2AY25541C

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