Yadav Krishna K, Shamir Dror, Kornweitz Haya, Friedlander Lonia, Zohar Moshe, Burg Ariela
Department of Chemical Engineering, Sami Shamoon College of Engineering, Beer-Sheva, 84100, Israel.
Analytical Chemistry Department, NRCN, Beer-Sheva, 8180000, Israel.
Small Methods. 2025 Mar 19:e2402157. doi: 10.1002/smtd.202402157.
Heavy metals, including Sb, are major pollutants with limits on their allowed concentration in drinking water. Therefore, there is a need for sensitive, simple, and portable detection methods for which electrochemical sensors are ideally suited. In this current study, Meta-chemical surfaces are developed for electrochemical sensing by patterning gold electrode surfaces with a mixture of black phosphorus (BP) and polymethyl methacrylate (PMMA) as nanoclusters using dip-pen nanolithography. It is found that the surface-to-volume ratio (S/V), fill factor, and ink composition affect the sensitivity of the sensor for Sb detection. The S/V ratio and fill factor can be altered by the dwell time, which has a complex effect on the limit of detection (varying from 14 to 24 ppb with the changes in the dwell time). Density functional theory calculations show that the binding between Sb(III) and BP is more exergonic in the presence of PMMA. These results are significant because they allow for the development of more sensitive Sb sensors, which can affect the wider field of the detection of heavy metals in drinking water sources and achieve higher efficiency than the commonly used instruments.
包括锑在内的重金属是主要污染物，对其在饮用水中的允许浓度有限制。因此，需要灵敏、简单且便携的检测方法，而电化学传感器非常适合。在当前这项研究中，通过使用蘸笔纳米光刻技术，用作为纳米团簇的黑磷（BP）和聚甲基丙烯酸甲酯（PMMA）的混合物对金电极表面进行图案化，从而开发出用于电化学传感的元化学表面。研究发现，表面积与体积比（S/V）、填充因子和墨水成分会影响传感器对锑检测的灵敏度。S/V比和填充因子可通过驻留时间改变，驻留时间对检测限有复杂影响（随着驻留时间的变化，检测限在14至24 ppb之间变化）。密度泛函理论计算表明，在存在PMMA的情况下，Sb(III)与BP之间的结合更能释放能量。这些结果意义重大，因为它们有助于开发更灵敏的锑传感器，这可能会影响饮用水源中重金属检测的更广泛领域，并比常用仪器实现更高的效率。
