Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg2+ Ions,Advanced Sustainable Systems

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Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg2+ Ions
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2020-06-11 , DOI: 10.1002/adsu.202000068
Md Tawabur Rahman ₁ , Abdullah Al Maruf ₂ , Sakib Faisal ₁ , Rajesh Pathak ₁ , Khan Mamun Reza ₁ , Ashim Gurung ₁ , Matthew Hummel ₃ , Zhengrong Gu ₃ , Md Ashiqur Rahman Laskar ₁ , Sheikh Ifatur Rahman ₁ , Buddhi Sagar Lamsal ₁ , Qiquan Qiao _{1,

4}

Affiliation

Electrochemical sensors for mercury ion detection would ideally demonstrate wide linear detection ranges (LDRs), ultratrace sensitivity, and high selectivity. This work presents an electrochemical sensor based on metallic 1T phase tungsten disulfide (WS₂) microflowers for the detection of trace levels of Hg²⁺ ions with wide LDRs, ultratrace sensitivity, and high selectivity. Under optimized conditions, the sensor shows excellent sensitivities for Hg²⁺ with LDRs of 1 nm–1 µm and 0.1–1 mm. In addition to this, the limit of detection of the sensor toward Hg²⁺ is 0.0798 nm or 79.8 pm, which is well below the guideline value recommended by the World Health Organization. The sensor exhibits excellent selectivity for Hg²⁺ against other heavy metal ions including Cu²⁺, Fe³⁺, Ni²⁺, Pb²⁺, Cr³⁺, K⁺, Na⁺, Ag⁺, Sn²⁺, and Cd²⁺. The thus‐obtained excellent sensitivity and selectivity with wide LDRs can be attributed to the high conductivity, large surface area microflower structured 1T‐WS₂, and the complexation of Hg²⁺ ions with S²⁻. In addition to good repeatability, reproducibility, and stability, this sensor shows the practical feasibility of Hg²⁺ detection in tap water suggesting a promising device for real applications.

中文翻译：

金属1T相二硫化钨微型花用于痕量水平的Hg2 +离子检测

用于汞离子检测的电化学传感器理想地具有宽线性检测范围（LDR），超痕量灵敏度和高选择性。这项工作提出了一种基于金属1T相二硫化钨（WS ₂）微型花的电化学传感器，用于检测痕量水平的Hg ²⁺离子，具有宽的LDR，超痕量灵敏度和高选择性。在最佳条件下，传感器对Lg为1 n m –1 µm和0.1–1 m m的Hg ²⁺表现出出色的灵敏度。除此之外，传感器对Hg ²⁺的检测极限为0.0798 n m或79.8 p m，该值远低于世界卫生组织建议的指导值。该传感器对Hg ^2+的选择性^优于其他重金属离子，包括Cu 2 ⁺，Fe ³⁺，Ni 2 ⁺，Pb 2 ⁺，Cr ³⁺，K ⁺，Na ⁺，Ag ⁺，Sn ²⁺和Cd ²⁺。如此获得的出色的灵敏度和选择性以及宽的LDR可以归因于高电导率，大表面积的微花结构的1T-WS ₂以及Hg ²⁺离子与S ²⁻的络合。除了良好的可重复性，可重复性和稳定性外，该传感器还显示了自来水中Hg ²⁺检测的实际可行性，为实际应用提供了有希望的设备。

更新日期：2020-06-11

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