HEDP-capped terbium orthophosphate nanoparticles as sensitive luminescent probes for the detection of Pb²⁺ ions

Abstract

Terbium orthophosphate nanoparticles were synthesized using 1-hydroxy ethylidene-1,1-diphosphonic acid(HEDP) as a capping ligand under hydrothermal conditions at 80 °C. These HEDP-capped TbPO₄ nanoparticles owned a hexagonal phase structure according to the powder X-ray diffraction(XRD) results and were spherical monodispersed particles with a diameter of about 10 nm confirmed by transimission electron microscope(TEM) images. Interestingly, the luminescent intensities of the HEDP-capped TbPO₄ nanoparticles decreased obviously in the presence of Pb²⁺ ions and such a quenching behavior of luminescence was well fitted by the Stern-Volmer equation.

Keywords

Lanthanide nanoparticle / Hydrothermal synthesis / Detection of Pb²⁺ / Luminescent probe

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