A 3D metal-organic framework (Cu_4.5(BTZE)_1.5(OH)₄(SO₄)(H₂O)_1.5∙4H₂O)_n (BTZE is 1,2-bis(tetrazol-5-yl) ethane anion) modified carbon paste electrode (Cu-BTZE/CPE) has been fabricated for hydrazine sensing. The Cu-BTZE framework was prepared through a facile solvo-thermal method and characterized by Fourier-transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode were studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and amperometry. Owing to the large electrochemically active surface area and enhanced electron transfer efficiency of Cu-BTZE framework, the Cu-BTZE/CPE showed enhanced electrocatalytic activity toward the oxidation of hydrazine compared with unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.02~1.2 μM and 1.2~500 μM, respectively. The detection limit was 6 nM, lower than the reported Cu-based hydrazine sensors. Furthermore, the sensor has applied for the determination of hydrazine in water samples.

中文翻译：

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Cu-BTZE框架平台上用于肼的灵敏电化学传感器

3D金属-有机骨架（Cu _4.5（BTZE）_1.5（OH）₄（SO ₄）（H ₂ O）_1.5 ∙4H ₂ O）_n（BTZE是1,2-双（四唑-5-基）乙烷阴离子）修饰的碳糊电极（Cu-BTZE / CPE）已用于肼感测。Cu-BTZE骨架是通过简便的溶剂热法制备的，并通过傅里叶变换红外光谱，X射线衍射和扫描电子显微镜进行表征。同时，通过电化学阻抗谱，计时库仑法，循环伏安法和安培法研究了修饰电极的电化学性能。由于具有较大的电化学活性表面积和Cu-BTZE骨架的增强的电子转移效率，与未改性的CPE相比，Cu-BTZE / CPE对肼的氧化具有增强的电催化活性。在优化条件下 安培电流分别在0.02〜1.2μM和1.2〜500μM范围内呈线性关系。检测限为6 nM，低于报道的基于铜的肼传感器。此外，该传感器还用于测定水样中的肼。