Foundry of Reticular Materials of Sustainably Laboratory & Functional Nanotechnology Devices Laboratory, Institute of Nanoscience and Nanotechnology, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
Mikrochim Acta. 2022 Sep;189(9):356. doi: 10.1007/s00604-022-05450-y. Epub 2022 Aug 30.
An amperometric nitrite sensor is reported based on a screen-printed carbon electrode (SPCE) modified with copper(II)-benzene-1,4-dicarboxylate (Cu-BDC) frameworks and iron(III) oxide nanoparticles (FeO NPs). First, copper(I) oxide (CuO) nanocubes were synthesized, followed by a solvothermal reaction between CuO and HBDC to form square plate-like Cu-BDC frameworks. Then, FeO NPs were electrodeposited on Cu-BDC frameworks using a potentiostatic method. The FeO@Cu-BDC nanocomposite benefits from high conductivity and large active surface area, offering excellent electrocatalytic activity for nitrite oxidation. Under optimal amperometric conditions (0.55 V vs. Ag/AgCl), the sensor has a linear range of 1 to 2000 µM with a detection limit of 0.074 µM (S/N = 3) and sensitivity of 220.59 µA mM cm. The sensor also provides good selectivity and reproducibility (RSD = 1.91%, n = 5). Furthermore, the sensor exhibits long-term stability, retaining 91.4% of its original current after 4 weeks of storage at room temperature. Finally, assessing nitrite in tap and mineral water samples revealed that the FeO@Cu-BDC/SPCE has a promising prospect in amperometric nitrite detection.
一种安培型亚硝酸根传感器，基于经铜（II）-苯-1,4-二羧酸（Cu-BDC）框架和氧化铁纳米粒子（FeO NPs）修饰的丝网印刷碳电极（SPCE）构建而成。首先，合成了氧化铜（CuO）纳米立方体，然后通过 CuO 和 HBDC 之间的溶剂热反应形成方板状的 Cu-BDC 框架。然后，通过恒电位法在 Cu-BDC 框架上电沉积 FeO NPs。FeO@Cu-BDC 纳米复合材料得益于高导电性和大的活性表面积，对亚硝酸根氧化具有优异的电催化活性。在最佳安培条件（0.55 V 对 Ag/AgCl）下，传感器对 1 至 2000 µM 的线性范围具有检测限为 0.074 µM（S/N = 3）和灵敏度为 220.59 µA mM cm 的特点。该传感器还具有良好的选择性和重现性（RSD = 1.91%，n = 5）。此外，该传感器表现出长期稳定性，在室温下储存 4 周后，其原始电流保留了 91.4%。最后，评估自来水中和矿泉水样品中的亚硝酸盐表明，FeO@Cu-BDC/SPCE 在安培型亚硝酸根检测方面具有广阔的前景。
