Effect of Er doping on flame-made SnO2 nanoparticles to ethylene oxide sensing

Flame-Spray-Synthesized La2O3-Loaded WO3 Nanoparticle Films for NO2 Sensing

“…Following the International Union of Pure and Applied Chemistry (IUPAC), all isotherms (Figure S-3a–c, SI) fit in the class of II-H3, suggesting boundless multilayer sorption. The pores associated with the narrow hysteresis loops of isotherms may correspond to interstitial cavities among agglomerated flame-made nanoparticles and not genuine mesopores inside nanoparticles due to the fact that flame-made nanoparticles are not porous. ,, The relevant BJH pore-diameter distributions of all samples (inset of Figure S-3a–c, SI) dictate similar pore characteristics regardless of the La content, implying that the ultrasmall La 2 O 3 nanoparticles insignificantly influence the cavities formed around nanoparticles . Accordingly, the related specific surface area (SSA BET ) in terms of the La content, as reported in Figure S-3d (SI), shows that SSA BET increases slightly from 51.9 to 55.5 m 2 /g with growing La amount from 0.0 to 0.2 wt % and then declines weakly to 47.7 m 2 /g when the La content goes up to 2.0 wt %.…”

“…Following the International Union of Pure and Applied Chemistry (IUPAC), all isotherms (Figure S-3a−c, SI) fit in the class of II-H3, suggesting boundless multilayer sorption. The pores associated with the narrow hysteresis loops of isotherms may correspond to interstitial cavities among agglomerated flamemade nanoparticles and not genuine mesopores inside nanoparticles due to the fact that flame-made nanoparticles are not porous 4,31,35. The relevant BJH pore-diameter…”

The growth behavior of brain-like SnO2 microspheres under a solvothermal reaction with tetrahydrofuran as a solvent and their gas sensitivity

“…1,53 SnO 2 is a typical ntype semiconductor and its gas sensing mechanism can be explained by the remarkable resistance change when the sensor is exposed to air and tested gases. 4,54 When SnO 2 sensor in air atmosphere, oxygen molecules are adsorbed on the surface of SnO 2 to form chemisorbed oxygen (O À and O 2À ) by capturing electrons from SnO 2 , resulting in the formation of an electron depletion layer (EDL) and the resistance is named R a . 17 Upon SnO 2 sensor was exposed to H 2 S gas, the chemisorbed oxygen ions O À and O 2À will react with H 2 S and electrons are released back to SnO 2 conduction band to recombine with holes, leading to a thinner EDL and a lower sensor resistance (R g ).…”

“…Metal oxide semiconductor (MOS) materials are widely studied in many fields such as gas sensors, 1–5 lithium-ion batteries, 6–8 solar cells, 9–12 liquid crystal displays, 13,14 transparent conductive electrodes, 10,12 and so on. 15,16 SnO 2 has been studied in gas sensors, including the specific response research of combustible gas, 5,17 VOCs 4,18 and many other gases. Based on these different applications, a large number of SnO 2 with different morphology have been synthesized, including SnO 2 hollow nanospheres, 19–23 nanosheets, 24,25 nanosheet self-assembled spheres, SnO 2 thin film, 26,27 SnO 2 nanotubes, 17 SnO 2 nanowires 28 and so on.…”

Interfacial Catalysis Enabled Acetone Sensors Based on Rationally Designed Mesoporous Metal Oxides with Erbium‐Doped WO3 Framework

“…possess distinct doping advantages such as natural surface basicity, rapid oxygen‐ion mobility, and catalytic properties based on their 4f–4f electron transitions. [ 23–26 ] Er as important rare earth element ([Xe] 4f11) has been deeply investigated in photoluminescence by adsorbing various lights (infrared, visible, and ultraviolet) and it can also bring lots of defects and change the band gap structure due to its special 4f shell transition, [ 27,28 ] which can significantly improve the material sensitivity and selectivity towards targeted gas.…”