Synthesis and characterization of highly organized mesoporous palladium-doped tin dioxide thin films for gas sensing

Dopant-mediated surface charge imbalance for enhancing the performance of metal oxide chemiresistive gas sensors

“…3a). 21–48,68–71,74 For p-type doped systems where holes play the role of majority charge carrier, the situation is opposite to the above. With an increase in the excess surface positive charge, there is greater chance of incoming electron–hole recombination.…”

“…4), highlighting a convenient strategy in reducing gas detection. 21–48,68–71,74 On the other hand, 12.3% cases report the generation of surface excess negative charges for p-type sensors to make them sensitive toward oxidizing gases (Fig. 4), which is indicative of the process used popularly in detecting oxidizing gases.…”

Block copolymer-templated synthesis of highly organized mesoporous TiO2-based films and their photoelectrochemical applications

“…Their synthetic strategies have been largely repeated by other scientists and have been a universal route to fabricate highly organized mesoporous TiO 2 films with tunable surface area, pore size and mesophase up to now. With the similar synthetic strategy applied to the mesoporous TiO 2 films, highly organized mesoporous structures have been further tailored for other transition metal oxide films, including ZrO 2 [17,18], SnO 2 [19][20][21], Nb 2 O 5 [22], and WO 3 [23]. Additionally, enhanced material properties originating from highly ordered mesoporous structures have been demonstrated in many applications, such as adsorption, photocatalysis, catalyst supports, chromism, photovoltaics, luminescent devices, sensors, and others.…”

3D hierarchical porous SnO2derived from self-assembled biological systems for superior gas sensing application,

“…The gas sensing process, generally involving the gas transport in the materials and the subsequent surface reaction between gas molecules and the sensing particles, suggests that structures that can transport gas molecules effectively would be extremely desirable in gas sensing materials. [23][24][25] Currently, hollow structures, 26 macro-or nanoporous structures, 27,28 and hierarchical structures, 29 exhibiting good gas transportability, have all been proven to be excellent structural candidates for gas sensors. Our previous works also showed that such structures could not only enhance the gas response but also give good selectivity, and furthermore it was found that the gas response could be affected significantly by the membranous structures.…”