Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guangxi, 541004, Guilin, People's Republic of China.
College of Chemistry and Material Science, Shandong Agricultural University, Taian, 271018, People's Republic of China.
Mikrochim Acta. 2023 May 11;190(6):208. doi: 10.1007/s00604-023-05791-2.
A novel magnetic TiCT-MXene/FeO composite was prepared from TiCT and magnetic FeO. The characterizations by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) exhibited that the TiCT/FeO nanomaterial presented an outstanding conductivity and a large specific area, which could improve the electron transfer rate, leading to the amplification of the sensor's signal. Furthermore, an ultrasensitive molecularly imprinted electrochemical sensor based on MXene/FeO composites was fabricated for detecting methylmalonic acid (MMA) with high selectivity. The current intensity of differential pulse voltammetry of the sensor presented a good linear relationship with the logarithm of MMA concentration ranging from 9 × 10 mol L to 9 × 10 mol L. The detection limit of the sensor was 2.33 × 10 mol L. The fabricated sensor was utilized for detecting MMA in human serum samples with excellent recoveries. Therefore, this method significantly improved the sensitivity of detection, and constitutes an affordable sensing platform for trace detection of organic carboxylic acid.
一种新型的磁性 TiCT-MXene/FeO 复合材料由 TiCT 和磁性 FeO 制备而成。电化学阻抗谱（EIS）和扫描电子显微镜（SEM）的特性表明，TiCT/FeO 纳米材料具有优异的导电性和大的比表面积，这可以提高电子转移率，从而放大传感器的信号。此外，基于 MXene/FeO 复合材料的超灵敏分子印迹电化学传感器被用于检测甲基丙二酸（MMA），具有高选择性。传感器的差分脉冲伏安法电流强度与 MMA 浓度的对数呈良好的线性关系，范围从 9×10 mol L 到 9×10 mol L。传感器的检测限为 2.33×10 mol L。该传感器用于检测人血清样品中的 MMA，回收率良好。因此，该方法显著提高了检测灵敏度，为痕量有机羧酸的检测提供了一种经济实惠的传感平台。
