Synergistic Catalytic Acceleration of MXene/MWCNTs as Decorating Materials for Ultrasensitive Detection of Morphine
Shufang Ren, Runyan Feng, Shounian Cheng, Qingtao Wang, Zhixiang Zheng
Abstract
Abstract Ti 3 C 2 T X MXene was synthesized by exfoliating pristine Ti 3 AlC 2 phase with hydrofluoric acid. The simple methods of mechanical mixing and drop‐casting of Ti 3 C 2 T X and MWCNTs were carried out to prepare sensing electrode of Ti 3 C 2 T X /MWCNTs/GCE. The composite and topography, especially the surface functional groups of Ti 3 C 2 T X /MWCNTs were analyzed by XRD, SEM, FTIR, XPS, and Raman spectrum. The results turned out that Ti 3 C 2 T X was characteristic by accordion‐like 2D nanostructure with the surfaces terminated with −OH, −F, and =O. When combining with acid pretreated, the interaction between the functional groups of Ti 3 C 2 T X and MWCNTs facilitated the convenience and reproducibility of the robust modified electrodes and could make Ti 3 C 2 T X /MWCNTs/GCE possess good synergistic catalytic acceleration by increasing the electron transfer efficiency as well as adsorption and aggregation of MOP analyte onto the electrode surface. Versatile electrochemical measurements of CV, DPV and EIS were used to investigate the electrochemical performance of Ti 3 C 2 T X /MWCNTs/GCE sensing platform. The linear detection range is 0.01–100 μM with the limit of detection of 0.0092 μM (S/N=3). The sensor has good stability, repeatability, reproducibility and anti‐interference. In the detection of serum and urine samples, it has a good recovery rate.