Engineered photoelectrochemical platform for the ultrasensitive detection of caffeic acid based on flower-like MoS2 and PANI nanotubes nanohybrid

As a newly emerged and rapidly developing analysis technique, photoelectrochemical detection has received increasing attention due to its satisfactory sensitivity, weak background interference signal and remarkable analytical performances. Accordingly, a novel photoelectrochemical platform for the ultrasensitive detection of caffeic acid has been developed based on flower-like MoS2 and PANI nanotubes nanohybrid. Remarkably, owing to the sufficient photogenerated electron-hole pairs originated from the flower-like MoS2 and efficient electron transfer on PANI under visible light irradiation, the linear range of caffeic acid was found to be 0.2 to 110.51 mu M, 110.51 to 482 mu M with a detection limit of 0.13 mu M by DPV technique and meanwhile the linear range of caffeic acid was found to be 1.02 to 520 mu M with detection a limit of 0.76 mu M by i-t curves. More interestingly, the PANI nanotubes supported flower-like MoS2 also exhibited high durability with negligible decay after long-term detection, showing an excellent photo-current enhanced performance to the photoelectrochemical detection.