A promising and highly sensitive electrochemical platform for the detection of fentanyl and alfentanil in human serum. - Li, Meng; Duan, Shimeng; Chen, Haiou; Zou, Fangyuan; Zhang, Genlin; Liu, Qingju; Zhang, Ruilin; Zeng, Xiaofeng; Bai, Huiping (Microchimica Acta, 2023)