Atomically dispersed rhodium on ordered macroporous In₂O₃ for the highly sensitive detection of ethanol and the sensing mechanism

Abstract

Ethanol is a volatile organic compound. Exposure to its vapors can cause breathing difficulties, headaches, drowsiness, and eye irritation. The development of highly sensitive ethanol sensors is of great significance...

Interface Defects and Carrier Regulation in MOF-Derived Co3O4/In2O3 Composite Materials for Enhanced Selective Detection of HCHO

“…40,45 To further confirm this observation, the average grain size (D), interplanar spacing (d ( 222) ), and lattice strain (ε) of all sensing materials were calculated using the Scherrer equation. 26 The grain size was approximately 10 nm, and the lattice strain slightly increased with the increasing modification load, further supporting the possibility of increased surface defects caused by this surface modification method. 26,46 The phase structure of the surface Co 3 O 4 can be obtained within a narrower range by using laser confocal Raman microscopy (Raman).…”

“…26 The grain size was approximately 10 nm, and the lattice strain slightly increased with the increasing modification load, further supporting the possibility of increased surface defects caused by this surface modification method. 26,46 The phase structure of the surface Co 3 O 4 can be obtained within a narrower range by using laser confocal Raman microscopy (Raman). In Figure 1f S1), which were consistent with the theoretical loading amount.…”

“…The activation energy (E a ) of the reaction process of HCHO with different materials was calculated using the Arrhenius equation, as detailed in the Supporting Information. 26 The activation energies of the In 2 O 3 and MZO-6 materials were 39.85 and 19.56 kJ/mol, respectively (Figure 7g,h). Oxygen vacancies contributed to the decrease in the activation energy barrier by lowering the HCHO adsorption energy barrier and altering the HCHO reaction pathway, which was a direct factor in the ultrahigh response to HCHO.…”

“…16,17 Currently, an increasing number of studies are employing modification methods, such as doping with heteroatoms, 18,19 construction of defect structures, noble metal modification, 20 and forming heterojunctions. 21,22 These methods aim to change the pore structure, 23 surface acidity/ basicity, 24,25 elemental state, 26,27 and Fermi level of metal oxide semiconductors to achieve selective detection of gases with different properties. 28 For example, Guo et al 29 achieved enhanced sensitivity to HCHO by using MOF templates and noble metal catalysis to promote oxygen vacancies and increased oxygen adsorption.…”

“…The oxide resistive gas sensors often exhibit cross responses to common interfering gases such as ethanol, triethylamine, and xylene . The ethanol gas, in particular, is commonly found in daily life, and its numerous −CH bonds and small kinetic molecular diameter increase the difficulty of low-concentration HCHO detection. , Currently, an increasing number of studies are employing modification methods, such as doping with heteroatoms, , construction of defect structures, noble metal modification, and forming heterojunctions. , These methods aim to change the pore structure, surface acidity/basicity, , elemental state, , and Fermi level of metal oxide semiconductors to achieve selective detection of gases with different properties . For example, Guo et al achieved enhanced sensitivity to HCHO by using MOF templates and noble metal catalysis to promote oxygen vacancies and increased oxygen adsorption.…”