Rational Design of SnO2 Hollow Microspheres Functionalized with Derivatives of Pt Loaded MOFs for Superior Formaldehyde Detection

Abstract

In this work, SnO2 hollow microspheres functionalized with different incorporated amounts of Pt@Co3O4 complex catalyst were innovatively designed by using an MOF template. The results show that sensor based on the optimal incorporated amount of Pt@Co3O4 not only greatly enhances the response value of SnO2 to formaldehyde (Rair/Rformaldehyde = 4240 toward 100 ppm) but also decreases the low detection limit (50 ppb), which is quite outstanding compared with other SnO2-based formaldehyde sensors. Further analysis proves that the content of oxygen vacancy and chemisorbed oxygen and the catalytic effect of ultra-small Pt play the key roles in improving the formaldehyde sensing performance. Meanwhile, this present work demonstrates that oxide semiconductors functionalized with the derivatives of MOF templated catalysts may lead to the discovery of new material systems with outstanding sensing performance.

Ar plasma-engraved rGO/In2O3 hollow nanospheres with rich oxygen vacancies for enhanced triethylamine detection

“…A quantitative amount of gas analytical liquid is injected into the 1 l glass chamber used for gas testing, covered with a stopper, and the evaporation of the measured liquid is accelerated by shaking the bottle body multiple times, so that the corresponding gas can fill the entire test chamber. The formula for the concentration (C (ppm)) of the gas is given as follows [15,16].…”

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

“…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. Jo et al completely eliminated the interference of ethanol and achieved high selectivity for HCHO at room temperature by coating the sensor with a mixed matrix membrane (MMM) composed of ZIF-7 nanoparticles and polymers.…”

“…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. Jo et al 30 mixed matrix membrane (MMM) composed of ZIF-7 nanoparticles and polymers.…”

Morphology and optical properties of wet chemistry synthesized submicron CePO4:Tb3+ hollow spheres

“…In recent years, the study of rare earth doped luminescent (REDL) materials has become an increasingly popular the compelling application prospect in many fields, such as electroluminescent techniques, biological labels, integrated optics, and security ink [4][5][6][7][8][9][10][11][12][13][14].…”