CO sensor based on thick films of 3D hierarchical CeO2 architectures

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

“…When interacted with target gases, the surface adsorption and/or chemical reaction give rise to the movement of the carriers, the change of dipole moment, the shift of potential barrier, or the transport of ions, according to different proposing mechanisms. [233] Additionally, because of low cost, easy production and compact size, CeO 2 -based sensors have been widely used for the detection of CO, [236] O 2 , [237] NO x , [238] H 2 S, [239] humidity, [240] ethanol, [235] acetone, [238] and so on. [232,233] As a material with excellent oxygen ions mobility, rapid Ce ion redox couple and good electronic conductivity, CeO 2 shows great potentials in gas sensor applications.…”

“…[234] Moreover, CeO 2 can also couple with other metal [235] or oxide materials to create heterojunctions for improved performance. [233] Additionally, because of low cost, easy production and compact size, CeO 2 -based sensors have been widely used for the detection of CO, [236] O 2 , [237] NO x , [238] H 2 S, [239] humidity, [240] ethanol, [235] acetone, [238] and so on. [241] As the sensor property is determined by the adsorption properties of the gas and reaction rates of analyzed gases, the most important parameters for gas sensor performance (such as response, selectivity, sensitivity, operating temperature, response time, and recovery time) should be surface dependent, interface dependent, and structure dependent.…”

Ultra-simple synthetic approach to the fabrication of CeO2–ZrO2 mixed nanoparticles into homogeneous, domain, and core–shell structures in mesoporous spherical morphologies using supercritical alcohols

“…Previously, fabrication of CeO 2 , ZrO 2 , and CeO 2 -ZrO 2 composites has been accomplished through several techniques, for example by using sacrificial templates such as polymers [29], colloidal carbon [30], and silica [31] and by calcination of metal-organicframeworks (MOFs) [32,33], to yield higher-order spherical, core-shell, tube, and cubic structures. Recently, we developed an ultimately simple, rapid, and template-free fabrication strategy for CeO 2 and ZrO 2 MARIMO NPs, in which a precursor solution of Ce(NO 3 ) 3 or ZrO(NO 3 ) 2 and formic acid in methanol was rapidly heated (at a rate of 500 °C/min) to 300 °C in a sealed SUS-316 tubular reactor and maintained at the temperature for only 10 min [25].…”

Growth and properties of well-crystalline cerium oxide (CeO2) nanoflakes for environmental and sensor applications

“…CeO 2 has fluorite-like cubic structure with each Ce 4+ ions surrounded by eight O 2À ions in face-centered cubic (FCC) arrangement, whereas each O 2À ion is tetrahedrally surrounded by four Ce 4+ ions. It has been explored for various applications including photocatalytic [10][11][12], energy and magnetic data storage [13], sensors for CO [14], ethanol [15], H 2 O 2 [16], nitrophenol [17] etc., UV blocker [18], abrasives [19,20], fuel cells [21,22], gates for metal-oxide semiconductor devices [23], promoter in three-way catalysts (TWC) for the elimination of toxic auto-exhaust gases from vehicles [24,25], and so on. Because of the various interesting properties and wide range of applications, a variety of CeO 2 nanomaterials such as nanocubes, nanotubes, nanopolyhedra, nanowires, nanorods are grown by several techniques including solution precipitation, sonochemical, hydrothermal, crystallization, microemulsion, mechano-chemical, thermal decomposition, sol-gel, thermal hydrolysis, etc, and are reported in the literature .…”