Recent progress of gas sensors based on metal oxide composites derived from bimetallic metal-organic frameworks

Perovskite-Structured BiFeO3 Nanoparticles with Abundant Oxygen Vacancies for Selective n-Butanol Gas Sensing

“…When BiFeO 3 nanoparticles come into contact with air, oxygen molecules capture electrons from conductance and are chemisorbed on the sensitive material’s surface, forming oxygen species (O 2 – , O – , and O 2– ), which depends on the working temperature. During the oxygen adsorption process, the form of a hole accumulation layer (HAL) with lower resistance leads to the bending of energy bands and the emergence of potential barriers; therefore, the resistance in the air decreases. − When the BiFeO 3 nanoparticles are in a n -butanol (reducing gas) atmosphere at a temperature of 280 °C, a reaction occurs between n -butanol and surface-adsorbed oxygen (O – ). Meanwhile, the generated electrons recombine with holes, leading to a consequent increase in resistance.…”

Synergy of W doping and oxygen vacancy engineering on d-band center modulation for enhanced gas sensing performance

“…1–3 Gas sensing technology is essential for the architecture of IoT, as it serves as the foundation for the upper structure, enabling the perception and collection of information. 4,5 The development of new technologies and demand for intelligence are driving continuous progress in the field of gas detection. 6,7…”

Design of 3D flower-like NiWO4/WO3 heterostructures with excellent trimethylamine sensing performance

“…Among these, metal oxide semiconductor sensors, known for their high sensitivity, straightforward fabrication, cost efficiency, and seamless integration with modern control systems, have garnered considerable interest. 8,9 Notably, tungsten trioxide (WO 3 ), as a typical n-type semiconductor, has been extensively investigated for its exceptional physical and chemical properties, demonstrating significant potential in detecting both oxidizing and reducing gases. [10][11][12] However, further enhancements are necessary to optimize the sensing response, selectivity, stability, and response/recovery times of WO 3 sensors at lower temperatures.…”