Cobalt ions induced morphology control of metal-organic framework-derived indium oxide nanostructures for high performance hydrogen sulfide gas sensors

Hydrothermal Synthesis of SnO2 with Different Morphologies as Sensing Materials for HCHO Detection

“…In addition, after the injection of the test gas, sensors required some time to arrive at 90% of the resistance change, which was defined as the response time. The recovery times of sensors are defined as the time when the resistance change reaches 90% of the final equilibrium state in the air …”

“…12,13 SnO 2 as an n-type MOS not only possesses a wide band gap (3.6 eV) at room temperature 14 but also is first applied in gas sensors of all semiconductor materials. 15 It can be synthesized into various forms, including nanoflowers, 16 nanoparticles, 17 nanorods, 18 and nanofibers 2 with different methods. 19,20 Metal−organic frameworks (MOFs) represent a novel class of coordination polymer materials in gas sensors due to many unique advantages because of their variable structures, easy preparation, and environment-friendliness.…”

“…In recent years, MOS-based materials such as ZnO, TiO 2 , Co 3 O 4 , In 2 O 3 , and SnO 2 , have been one of the most promising materials to be made into a sensor for detecting HCHO. , SnO 2 as an n-type MOS not only possesses a wide band gap (3.6 eV) at room temperature but also is first applied in gas sensors of all semiconductor materials . It can be synthesized into various forms, including nanoflowers, nanoparticles, nanorods, and nanofibers with different methods. , Metal–organic frameworks (MOFs) represent a novel class of coordination polymer materials in gas sensors due to many unique advantages because of their variable structures, easy preparation, and environment-friendliness. More than 20,000 MOFs have been reported .…”

Hydrogen Adsorption in Ultramicroporous Metal-organic Frameworks Possessing Silent Open Metal Sites

“…[4] The crystallinity of porous materials, namely zeolites and MOFs, has enabled the study of intermolecular interactions of these materials with guest molecules on the atomic scale; this has resulted in the rational design and synthesis of new materials with improved performance for carbon capture, [5] hydrocarbon separation, [6] storage of methane and hydrogen (H2), [7] and detection of gases such as ammonia and hydrogen sulfide. [8] The harmful environmental effects of excessive combustion of fossil fuels, together with the intermittence of current sources of renewable energy, incentivize the search for alternative energy solutions. Hydrogen is a formidable fuel due to its high gravimetric energy density (142 MJ kg -1 ) and the environmentally benign sole product of combustion: water (H2O).…”

Hydrogen Adsorption in Ultramicroporous Metal–Organic Frameworks Featuring Silent Open Metal Sites

“…The empty space within porous solids such as carbons, carbon nanotubes, porous organic polymers, zeolites, and metal–organic frameworks (MOFs) allows for their use in numerous applications, including gas sensing, separation, and storage. , Understanding the interactions between the host material and guest molecules is vital to rationally assess the viability of porous materials for a desired application . The crystallinity of porous materials, namely zeolites and MOFs, has enabled the study of intermolecular interactions of these materials with guest molecules on the atomic scale; this has resulted in the rational design and synthesis of new materials with improved performance for carbon capture, hydrocarbon separation, storage of methane and hydrogen (H 2 ), , and detection of gases such as ammonia and hydrogen sulfide. − …”