Synergistic electrochemistry of YbBi-TCPP modified flexible laser-induced graphene for Cd2+monitoring in food

Abstract

Heavy metals, such as Cd2+, are risky to ecosystems and human health, largely because they are poisonous and prone to bioaccumulation. Consequently, it is vital to build a sensing platform that rapidly detects Cd2+ at very low levels. In this work, we introduce an innovative electrochemical sensing platform built upon a flexible laser-induced graphene (LIG) electrode, whose performance is further boosted by incorporating a bimetallic porphyrin MOF (i.e., YbBi-TCPP) produced via a solvothermal method. Benefitting from the orderly pore structure and numerous redox-active centers of YbBi-TCPP as well as the excellent conductivity of LIG, the gained YbBi-TCPP/ LIG displayed apparent cooperation, which substantially boosted the sensitivity of the sensing platform. With the conditions set to their optimum, the sensor exhibited a linear detection scope of 5-400 mu g/L, a detection limit of 0.43 mu g/L, and produced recovery efficiencies that were notably satisfactory (90.2%- 92.9%) in real meat samples including pork, mutton, and chicken. The manuscript introduces a scalable pathway for obtaining bimetallic porphyrin MOF and establishes a corresponding low-expense, high-durability electrochemical sensor for the appraisal of Cd2+.