Xiao Aijin, Li Meng, Hu Yiluo, Zhang Wei, Bai Huiping, Pan Xuejun, Jiang Fengzhi
School of Chemical Science and Technology, Yunnan University, Kunming, 650500, China.
School of International Rivers and Eco-Security, Yunnan University, Kunming, 650500, China.
Mikrochim Acta. 2025 Sep 6;192(10):639. doi: 10.1007/s00604-025-07508-z.
A CuFeO/NiCo-LDH heterojunction electrochemical sensor (LDH: layered double hydroxide) was developed for the sensitive detection of tetracycline (TC). The sensor was constructed by integrating ZIF-67-derived nanocage NiCo-LDH on nickel foam with CuFeO, forming a p-n heterojunction that enhanced electron transfer and TC adsorption. The sensor exhibited bilinear detection ranges (0.00594 ~ 1 and 1 ~ 25 μM) and a low detection limit of 1.98 nM. Recoveries in real water samples ranged from 92.0 to 109.0%, with relative standard deviations not exceeding 4.5%. In situ Raman spectroscopy and density functional theory calculations confirmed the involvement of multiple redox pairs (Ni/Ni, Co/Co, Fe/Fe and Cu/Cu) and strong interfacial adsorption energy. This sensor presents a practical and efficient approach for onsite TC monitoring.
开发了一种用于灵敏检测四环素（TC）的CuFeO/NiCo-LDH异质结电化学传感器（LDH：层状双氢氧化物）。该传感器通过将ZIF-67衍生的纳米笼状NiCo-LDH与泡沫镍上的CuFeO集成构建而成，形成了增强电子转移和TC吸附的p-n异质结。该传感器具有双线性检测范围（0.00594 ~ 1和1 ~ 25 μM），检测限低至1.98 nM。实际水样中的回收率在92.0%至109.0%之间，相对标准偏差不超过4.5%。原位拉曼光谱和密度泛函理论计算证实了多个氧化还原对（Ni/Ni、Co/Co、Fe/Fe和Cu/Cu）的参与以及强大的界面吸附能。该传感器为现场TC监测提供了一种实用且高效的方法。
