Real-Time and Wireless Transmission of a Nitrogen-Doped TiCT Wearable Gas Sensor for Efficient Detection of Food Spoilage and Ammonia Leakage.

With the rising popularity of smart homes, there is an urgent need for devices that can perform real-time online detection of ammonia (NH) concentrations for food quality measurement. In addition, timely warning is crucial to preventing individual deaths from NH. However, few studies can realize continuous monitoring of NH with high stability and subsequent application validation. Herein, we report on an integrated device equipped with a nitrogen-doped TiCT gas sensor that shows great potential in detecting food spoilage and NH leakage. The nitrogen doping results in the lattice misalignment of TiCT, subsequently realizing effective barrier height modulation and enhanced charge transfer efficiency of nitrogen-doped TiCT. Density functional theory calculations confirm the greatly enhanced adsorption of NH on nitrogen-doped TiCT. Our work can inspire the design of efficient gas sensors for real-time and wireless detection of food spoilage and NH leakage.