Large interlayer spacing Nb4C3Tx(MXene) promotes the ultrasensitive electrochemical detection of Pb2+on glassy carbon electrodes

A Nb4C3Tx(MXene)-modified glassy carbon electrode was used for the electrochemical detection of Pb(2+)ions in aqueous media. The sensing platform was evaluated by anodic stripping analysis after optimizing the influencing factors such as pH, deposition potential, and time. The large interlayer spacing, highclattice parameter and higher conductivity of Nb(4)C(3)T(x)compared to other MXenes enhance the electrochemical detection of Pb2+. The developed sensor can reach a detection limit of 12 nM at a potential similar to-0.6 V. Additionally, the developed sensor showed promising selectivity in the presence of Cu(2+)and Cd2+, and stability for at least 5 cycles of continuous measurements with good repeatability. This work demonstrates the potential applications of Nb(4)C(3)T(x)towards the development of effective electrochemical sensors.