Self-assembled monolayer of 2-(((5-mercapto-1,3,4-thiadiazol-2-yl)imino)methyl)phenol (MTP) on gold surface: A platform for impedimetric and potentiometric sensing of mercury(II),Analytica Chimica Acta

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Self-assembled monolayer of 2-(((5-mercapto-1,3,4-thiadiazol-2-yl)imino)methyl)phenol (MTP) on gold surface: A platform for impedimetric and potentiometric sensing of mercury(II)
Analytica Chimica Acta ( IF 5.7 ) Pub Date : 2024-04-17 , DOI: 10.1016/j.aca.2024.342607
Sarbjeet Kaur ₁ , Amrita Singh ₁ , Inderpreet Kaur ₁

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2-(((5-mercapto-1,3,4-thiadiazol-2-yl)imino)methyl)phenol (MTP) was synthesized, self-assembled on the surface of gold (Au) electrode (Au-MTP) followed by characterization using Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS). CV and EIS confirmed the formation of well-organized Au-MTP SAM free from defects and pinholes. Au-MTP was further utilized as a platform for sensing of Hg using EIS. The results showed sensitive and selective response of Au-MTP towards Hg in the linear concentration range from 1.0 × 10 M to 1.0 × 10 M with limit of detection (LoD) of 5.6 × 10 M. Furthermore, MTP was self-assembled on gold nanoparticles (AuNPs) and MTP bound gold nanoparticles (MTP-AuNPs) so obtained were used as modifier for construction of carbon paste electrode (CPE). Hg-CPE exhibited Nernstian response towards Hg with slope of 28.3 mV/decade in the concentration range from 1.0 × 10 M to 1.0 × 10 M with LoD of 6.3 × 10 M. Both the Au-MTP EIS sensor and Hg-CPE were successfully applied for estimation of Hg content in tap water samples.

中文翻译：

金表面2-(((5-巯基-1,3,4-噻二唑-2-基)亚氨基)甲基)苯酚(MTP)单层自组装：汞阻抗和电位传感平台(II)

合成了2-(((5-巯基-1,3,4-噻二唑-2-基)亚氨基)甲基)苯酚(MTP)，并在金(Au)电极表面自组装(Au-MTP)使用循环伏安法 (CV) 和电化学阻抗谱 (EIS) 进行表征。 CV 和 EIS 证实形成了组织良好、没有缺陷和针孔的 Au-MTP SAM。 Au-MTP 进一步被用作使用 EIS 检测汞的平台。结果表明，Au-MTP 在 1.0 × 10 M 至 1.0 × 10 M 的线性浓度范围内对汞具有灵敏和选择性的响应，检测限 (LoD) 为 5.6 × 10 M。此外，MTP 在金上自组装如此获得的纳米颗粒（AuNPs）和MTP结合的金纳米颗粒（MTP-AuNPs）被用作构建碳糊电极（CPE）的改性剂。 Hg-CPE 在 1.0 × 10 M 至 1.0 × 10 M 浓度范围内对 Hg 表现出能斯特响应，斜率为 28.3 mV/decade，LoD 为 6.3 × 10 M。Au-MTP EIS 传感器和 Hg-CPE 均成功用于估算自来水样品中的汞含量。

更新日期：2024-04-17

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