Journal of Nanoparticle Research ( IF 2.1 ) Pub Date : 2021-08-23 , DOI: 10.1007/s11051-021-05316-z Sangeetha Krishna Kumar 1 , Akhila Maheswari Mohan 1
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In this article, we demonstrate the fabrication and application of a naked eye–responsive solid-state Cu2+ opto-chemosensor for the detection and recovery of Cu2+ from various environmental water samples. The colorimetric ion sensor is fabricated by physically anchoring a 4-hexyl-6-(quinolin-8-yldiazenyl) benzene-1,3-diol (HQDB) chelating probe, onto the indigenously designed silica-polymer hybrid monolith host template, and is systematically characterized. The inimitable macroporous backbone with the continuous interconnected mesoporous web structure of the monolith template offers greater immobilization of the ligand molecules onto its surface. The porous hybrid monolithic framework provides better accessibility towards the probe chelating sites for the Cu2+, thereby offering a faster visual response within 2 min of contact time. The sensor enables a unique visible color transition from yellowish orange to dark brown due to the formation of stable 1:1 [Cu2+-HQDB] (λmax 480 nm) charge-transfer complexes. The solid sensor exhibits high efficiency of sensing at pH 8.0, with a limit of detection (LOD) and quantification (LOQ) values of 0.45 and 1.5 ppb, respectively. Moreover, the solid sensor proffers remarkable selectivity towards Cu2+, which makes it more useful for real-time analysis, within a short analysis time. The porous monolithic sensor is reusable for eight cycles of sensing applications with greater data reproducibility when applied to real water samples.
Graphical abstract
中文翻译：
用于 Cu2+ 离子比色分析的多孔无机/有机混合整体式固体传感器
在本文中，我们展示了肉眼响应固态 Cu 2+光化学传感器的制造和应用，用于检测和回收各种环境水样中的 Cu 2+。比色离子传感器是通过将 4-hexyl-6-(quinolin-8-yldiazenyl) benzo-1,3-diol (HQDB) 螯合探针物理锚定到自主设计的二氧化硅-聚合物混合整体主体模板上来制造的，并且是系统地表征。独特的大孔骨架与整体模板的连续互连中孔网状结构提供了更大的配体分子在其表面上的固定。多孔混合整体框架为 Cu 2+的探针螯合位点提供了更好的可及性，从而在接触时间的 2 分钟内提供更快的视觉响应。由于稳定的 1:1 [Cu 2+ -HQDB] (λ max 480 nm) 电荷转移复合物的形成，该传感器实现了从黄橙色到深棕色的独特可见颜色转变。固体传感器在 pH 8.0 时表现出高传感效率，检测限 (LOD) 和定量 (LOQ) 值分别为 0.45 和 1.5 ppb。此外，固体传感器对 Cu 2+ 具有显着的选择性，这使其在较短的分析时间内更适用于实时分析。当应用于真实水样时，多孔单片传感器可重复使用八次传感应用循环，具有更高的数据再现性。
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