Journal
NANOSCALE
Volume 5, Issue 4, Pages 1629-1637Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr33217e
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Funding
- Natural Science Foundation of China [10904119, J1210061]
- Natural Science Foundation of Jiangsu Province [SBK201240182]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2012-KF-12]
- Hong Kong Research Grants Council General Research Funds [CityU 112510, 112212]
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A new class of ratiometric fluorescence sensors composed of rare-earth (RE) compound nanotubes is described. Polyethylenimine-coated yttrium hydroxide fluoride nanotubes (YHF NTs) that were synthesized hydrothermally exhibit highly efficient fluorescence when doped with RE ions. The polyethylenimine on the NTs facilitates the incorporation of phosphors such as quantum dots or organic dyes onto the NT surface to produce dual-emitting nanocomposites which are excellent ratiometric fluorescence sensors. The phosphor layer and underlying tubes in the nanocomposites act as the indicator and reference probes, respectively. This ratiometric fluorescence method which can be applied to the detection of heavy metals in solutions, temperature sensing, and pH sensing boasts high sensitivity and selectivity as well as better accuracy than traditional intensity-based fluorescence methods.
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