A research team led by Professor HUANG Xingjiu at the Institute of Solid State Physics, the Hefei Institutes of Physical Science of the Chinese Academy of Sciences, has developed a highly stable adaptive integrated interface for ion sensing.
The study was recently published as an inside front cover article in Advanced Materials.
All-solid-state ion-selective electrode serves as a fundamental component in the ion sensing of intelligent biological and chemical sensors. The team previously developed several transducer materials using a like sandwich-type interface, enabling stable detection of common ions. However, the performance of such sensors is often limited by interface material and structure.
To overcome these challenges, the team introduced a novel interface using lipophilic MoS₂ regulated by CTA⁺, achieving spatiotemporal adaptive integration of the like-single-pieces on top and transduction layers on bottom. Electrochemical simulations confirmed optimal stability, with high charge transfer and minimal diffusion current. X-ray Absorption Fine Structure analysis revealed a mixed-capacitance mechanism driven by TFPB⁻ anion adsorption.
In application tests, the sensor showed excellent stability in Cd²⁺ detection and accurate detection in industrial wastewater.
The interface was further applied to sensors for K⁺, Na⁺, Ca²⁺, Mg²⁺, Pb²⁺, Cd²⁺, and Cu²⁺, all demonstrating near-Nernstian responses and enhanced stability.
This work provides a valuable strategy for designing next-generation high-performance ion sensors.
This study was published as an inside front cover article in Advanced Materials. (Image by CAI Xin)
