Hierarchical hollow microsphere and flower-like indium oxide: Controllable synthesis and application as H2S cataluminescence sensing materials

Fabrication of α-Fe2O3/g-C3N4 composites for cataluminescence sensing of H2S

“…7(d), which were similar to each other. The response and recovery time of the ␣-Fe 2 O 3 /g-C 3 N 4 sensor were as fast as 0.1 and 0.6 s, which were superior to most of the H 2 S gas-sensing materials reported previously, such as Fe 2 O 3 nanoparticles (15 and 120 s) [16], Fe 2 O 3 nanotubes (15 and 100 s) [17], hierarchical hollow microsphere In 2 O 3 (less than 5 and 25 s) [18], alkaline-earth metal carbonates (within 5 and 25 s) [19]. The perfect characteristic may be resulted from the composite which endowed fast transport of charge carriers from the surface into bulk to improve the reaction rate.…”

“…Zhang et al have fabricated CTLbased H 2 S gas sensors with Fe 2 O 3 nanoparticles [16] and Fe 2 O 3 nanotubes [17], which exhibited excellent catalytic performance on H 2 S measurement. Cai et al have developed In 2 O 3 with hierarchical hollow microsphere and flower-like microstructure [18] for detecting H 2 S gas. Liu et al have reported that using alkaline-earth metal carbonates as catalysts can identically achieve the detection [19].…”

Ultrasensitive and ultraselective detection of H2S using electrospun CuO-loaded In2O3 nanofiber sensors assisted by pulse heating

“…The H 2 S sensing characteristics were enhanced by altering the design of corresponding nanostructures or by the addition of catalytic additives. For example, nanowires, nanorods, nanotubes, nanofibers, yolk-shell nanomaterials, and hollow spheres have been used as excellent nanoarchitectures for H 2 S sensor applications, owing to their high surface area to volume ratio, high gas accessibility, and effective electron depletion [25][26][27][28]. The response and selectivity to H 2 S were enhanced by the loading of noble-metal catalysts (Pd, Pt, Au, etc.)…”

Cataluminescence‐based sensors: principle, instrument and application

“…It is found that the phase and morphology of the Mn 3 O 4 micro-octahedra had no change after the CTL tests, whereas the hexagonal nanoplates changed significantly after use. Cai et al observed that the sensor based on the In 2 O 3 hierarchical hollow microsphere exhibited a much higher sensitivity in detecting H 2 S gas than that based on the In 2 O 3 flower-like microstructure (48). For common volatile organic compounds (VOCs), the order of sensitivity of the sensors based on Y 2 O 3 in different morphologies is ranked as dumbbells microspheres > nanosheets (49).…”