Fiber-optic lead ion sensor based on MXene film integrated michelson interference structure

Abstract Ti 3 C 2 T x (MXene), a two-dimensional material prepared by solution etching, has abundant functional groups on its surface, which makes it have a great prospect in the field of biosensing environmental detection. In this work, a new optical fiber sensor integrated with MXene is proposed and fabricated. The sensor is constituted of a three-core fiber (TCF), a single-mode fiber (SMF), and a no-core fiber (NCF) to form a Michelson interference structure. The results indicate that MXene decorated fiber-optic sensor can detect trace lead ions (Pb 2+ ) and has a good response to the Pb 2+ solutions with the concentration of 0–100 μ M. At 0.001 μ M (i.e., 0.286 ppb) Pb 2+ , the response time is about 2 min. In addition, the fiber-optic sensor has excellent temperature, pH, and time stability. The present work provides a new idea for the detection of Pb 2+ in heavy metal pollution fields.