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  • Title: Luminescent CuS nanotubes as silver ion probes.
    Author: Zhang X, Wang G.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2009 Jun; 72(5):1071-5. PubMed ID: 19223231.
    Abstract:
    CuS nanotubes (NTs) made up of nanoparticles were successfully prepared in large quantities in an O/W microemulsion system under low temperature. Based on the characteristics of synchronous fluorescence spectroscopy (SFS), a new method with high sensitivity and selectivity was developed for rapid determination of silver ion with functional copper sulphide (CuS) nanotubes as a fluorescence probe. Under optimal conditions, functional copper sulphide displayed a calibration response for silver ion over a wide concentration range from 1.0x10(-10) to 1.0x10(-8)molL(-1). The limit of detection was 0.5x10(-10)molL(-1) and the relative standard deviation of eight replicate measurements for the highest concentration (1x10(-8)molL(-1)) was 3%. Compared with several fluorescence methods, the proposed method had a wider linear range and improved the sensitivity. Furthermore, the concentration dependence of the synchronous fluorescence intensity is effectively described by a Langmuir-type binding isotherm.
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