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PAA Modified Upconversion Nanoparticles for Highly Selective and Sensitive Detection of Cu2+ Ions
Frontiers in Chemistry ( IF 3.8 ) Pub Date : 2020-12-09 , DOI: 10.3389/fchem.2020.619764
Shaoshan Su , Zhurong Mo , Guizhen Tan , Hongli Wen , Xiang Chen , Deshmukh A. Hakeem

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 μM 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 μM. 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.



中文翻译:

PAA修饰的上转换纳米粒子用于Cu2 +离子的高选择性和灵敏检测

由于其对环境和生物学的影响,Cu 2+离子的检测至关重要。基于荧光的有机传感器由于UV /可见光激发源引起的穿透深度短,因此不适合用于Cu 2+检测。因此,我们已经证明了基于高灵敏度和选择性的近红外(NIR)可激发聚(丙烯酸)(PAA)涂层的上转换纳米粒子(UCNPs)为基础的传感器,用于Cu 2+检测。我们通过共沉淀途径构建了PAA修饰的Na(Yb,Nd)F 4 @Na(Yb,Gd)F 4:Tm @ NaGdF 4核-壳-壳结构的UCNPs传感器。PAA-UCNPs的上转换发射强度随Cu的增加呈线性下降由于Cu 2+和PAA-UCNP之间形成了羧酸铜络合物,因此2+的浓度为0.125至3.125μM。基于PAA-UCNPs的传感器的计算检出限为0.1μM。即使当Cu 2+与其他金属离子共存时,基于PAA-UCNPs的传感器对检测Cu 2+离子也非常灵敏和选择性。EDTA的加入通过形成EDTA-Cu 2+络合物(基于其对Cu 2+的更大亲和力)而显着逆转了上转换发射猝灭。因此,基于PAA-UCNPs的传感器由于在980 nm NIR激发下具有更高的灵敏度和选择性,因此可能成为Cu 2+检测的有前途的候选者。

更新日期:2021-01-08
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