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With the rising popularity of smart homes, there is an urgent need for devices that can perform real-time online detection of ammonia (NH 3 ) concentrations for food quality measurement. In addition, timely warning is crucial to preventing individual deaths from NH 3 . However, few studies can realize continuous monitoring of NH 3 with high stability and subsequent application validation. Herein, we report on an integrated device equipped with a nitrogen-doped Ti 3 C 2 T x gas sensor that shows great potential in detecting food spoilage and NH 3 leakage. The nitrogen doping results in the lattice misalignment of Ti 3 C 2 T x , subsequently realizing effective barrier height modulation and enhanced charge transfer efficiency of nitrogen-doped Ti 3 C 2 T x . Density functional theory calculations confirm the greatly enhanced adsorption of NH 3 on nitrogen-doped Ti 3 C 2 T x . Our work can inspire the design of efficient gas sensors for real-time and wireless detection of food spoilage and NH 3 leakage.