Selectivity of an Ag/BTO-Based Nanocomposite as a Gas Sensor Between NO and SO Gases.

The novel Ag/BTO/TiO nanocomposite was assessed for its gas-sensing capabilities toward hazardous gases NO and SO. It exhibited p-type behavior with increasing resistance for SO with a response and recovery time of ∼5 and ∼2 s, respectively, switching to n-type behavior when exposed to NO with a response and recovery time of ∼20 and ∼250 s, respectively. Analyte gas concentrations from 0 to 220 ppm were taken for analysis.

p-/n-Type Switching in the Ag/BTO/TiO Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia.

A novel Ag/BTO/TiO nanocomposite was prepared using chemical reduction and sol-gel techniques followed by sintering at ∼950 °C to grow rutile TiO and remove organic materials and hydroxyl groups. The structural, optical, morphological, dielectric, and gas-sensing properties were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and inductance, capacitance, and resistance meter, respectively. The surface plasmon resonance peak of Ag was observed at 428 nm, and the absorption edge of the Ag/BTO/TiO nanocomposite was observed at 235 nm, with an energy bandgap of 5.