Silver nanowires@TiO2 core-shell for room-temperature 1000 ppm NH3 gas sensors

Abstract

This study employs a simple liquid-phase deposition method to grow TiO2 onto nanoscale silver wires, with a diameter of 90 nm and a length of 15∼20 μm. This core-shell structure possesses a high specific surface area, which enhances the gas reaction surface. Measurements can be conducted at room temperature. The main mechanism relies on the conductive properties of silver to transmit electrons, while Schottky barriers between Ag and TiO2 further accelerate oxygen ionization and surface redox reactions. This structure may contribute to enhancing the response value, response time, and recovery time of gas sensors.

Keywords

• Titanium dioxide
• Silver nanowires
• Ammonia
• Core-shell structure
• Schottky junction
• Gas sensor