Craciun Cristina, Andrei Florin, Bonciu Anca, Brajnicov Simona, Tozar Tatiana, Filipescu Mihaela, Palla-Papavlu Alexandra, Dinescu Maria
Lasers Department, National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania.
Faculty of Physics, University of Bucharest, 077125 Magurele, Romania.
Nanomaterials (Basel). 2022 Mar 29;12(7):1138. doi: 10.3390/nano12071138.
This work is focused on the application of a laser-based technique, i.e., matrix-assisted pulsed laser evaporation (MAPLE) for the development of electrochemical sensors aimed at the detection of nitrites in water. Commercial carbon-based screen-printed electrodes were modified by MAPLE via the application of a newly developed composite coating with different concentrations of carbon nanotubes (CNTs), chitosan, and iron (II) phthalocyanine (CHFeN). The performance of the newly fabricated composite coatings was evaluated both by investigating the morphology and surface chemistry of the coating, and by determining the electro-catalytic oxidation properties of nitrite with bare and modified commercial carbon-based screen-printed electrode. It was found that the combined effect of CNTs with chitosan and CHFeN significantly improves the electrochemical response towards the oxidation of nitrite. In addition, the MAPLE modified screen-printed electrodes have a limit of detection of 0.12 µM, which make them extremely useful for the detection of nitrite traces.
这项工作聚焦于一种基于激光的技术，即基质辅助脉冲激光蒸发（MAPLE）在开发用于检测水中亚硝酸盐的电化学传感器方面的应用。通过应用一种新开发的含有不同浓度碳纳米管（CNT）、壳聚糖和铁（II）酞菁（CHFeN）的复合涂层，利用MAPLE对商用碳基丝网印刷电极进行了改性。通过研究涂层的形态和表面化学，以及用裸的和改性的商用碳基丝网印刷电极测定亚硝酸盐的电催化氧化性能，对新制备的复合涂层的性能进行了评估。结果发现，碳纳米管与壳聚糖和CHFeN的联合作用显著改善了对亚硝酸盐氧化的电化学响应。此外，MAPLE改性的丝网印刷电极的检测限为0.12μM，这使得它们在检测亚硝酸盐痕量方面极为有用。
