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Detection of the Cu 2+  ions is crucial because of its environmental and biological implications. The fluorescent-based organic sensors are not suitable for Cu 2+  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 2+  detection. We construct the PAA modified Na(Yb, Nd)F 4 @Na(Yb, Gd)F 4 :Tm@NaGdF 4  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 Cu 2+  concentration from 0.125 to 3.125 μM due to the copper carboxylate complex formation between Cu 2+  and PAA-UCNPs. The calculated detection limit of the PAA-UCNPs based sensor is 0.1 μM. The PAA-UCNPs based sensor is very sensitive and selective toward detecting the Cu 2+  ions, even when the Cu 2+  co-exist with other metal ions. The EDTA addition has significantly reversed the upconversion emission quenching by forming the EDTA-Cu 2+  complex based on their greater affinity toward the Cu 2+ . Therefore, the PAA-UCNPs based sensor can be a promising candidate for Cu 2+  detection because of their higher sensitivity and selectivity under 980 nm NIR excitation.

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