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 110.51μM, 110.51 to 482 μM with a detection limit of 0.13 μM by DPV technique and meanwhile the linear range of caffeic acid was found to be 1.02 to 520 μM with detection a limit of 0.76 μM 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.