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PAA Modified Upconversion Nanoparticles for Highly Selective and Sensitive Detection of Cu2+ Ions.


ABSTRACT: Detection of the Cu2+ ions is crucial because of its environmental and biological implications. The fluorescent-based organic sensors are not suitable for Cu2+ detection due to their short penetration depth caused by the UV/visible excitation source. Therefore, we have demonstrated a highly sensitive and selective near-infrared (NIR) excitable poly(acrylic acid) (PAA) coated upconversion nanoparticles (UCNPs) based sensor for Cu2+ detection. We construct the PAA modified Na(Yb, Nd)F4@Na(Yb, Gd)F4:Tm@NaGdF4 core-shell-shell structured UCNPs based sensor via a co-precipitation route. The upconversion emission intensity of the PAA-UCNPs decreases linearly with the increase in the Cu2+ concentration from 0.125 to 3.125 ?M due to the copper carboxylate complex formation between Cu2+ and PAA-UCNPs. The calculated detection limit of the PAA-UCNPs based sensor is 0.1 ?M. The PAA-UCNPs based sensor is very sensitive and selective toward detecting the Cu2+ ions, even when the Cu2+ co-exist with other metal ions. The EDTA addition has significantly reversed the upconversion emission quenching by forming the EDTA-Cu2+ complex based on their greater affinity toward the Cu2+. Therefore, the PAA-UCNPs based sensor can be a promising candidate for Cu2+ detection because of their higher sensitivity and selectivity under 980 nm NIR excitation.

SUBMITTER: Su S 

PROVIDER: S-EPMC7821086 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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PAA Modified Upconversion Nanoparticles for Highly Selective and Sensitive Detection of Cu<sup>2+</sup> Ions.

Su Shaoshan S   Mo Zhurong Z   Tan Guizhen G   Wen Hongli H   Chen Xiang X   Hakeem Deshmukh A DA  

Frontiers in chemistry 20210108


Detection of the Cu<sup>2+</sup> ions is crucial because of its environmental and biological implications. The fluorescent-based organic sensors are not suitable for Cu<sup>2+</sup> detection due to their short penetration depth caused by the UV/visible excitation source. Therefore, we have demonstrated a highly sensitive and selective near-infrared (NIR) excitable poly(acrylic acid) (PAA) coated upconversion nanoparticles (UCNPs) based sensor for Cu<sup>2+</sup> detection. We construct the PAA  ...[more]

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