Multi-Walled Carbon Nanotubes/BiPO₄/BiOI Heterostructure Composite Photoelectrochemical Sensor in Detection of Salicylic Acid

Abstract

In this work, BiOI, BiPO 4 , BiPO 4 /BiOI (M) and MWCNT/BiPO 4 /BiOI(MWCNT/M) heterostructure were synthesized through hydrothermal methods and served the function of fabricating photoelectrochemical (PEC) sensor for detection of Salicylic acid (SA). MWCNT covered with BiPO 4 /BiOI were observed with the aid of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Under visible light excitation, the low detection limit of 0.55 μM and working range of 1-320 μM and 480-3840 μM were obtained at the MWCNT/M/ITO. Moreover, it has excellent reproducibility and long-term stability. Meanwhile, results suggest that MWCNT/M developed herein offers a promising platform for the ultrasensitive detection of SA.