Catalytic properties of oxide nanoparticles applied in gas sensors

Abstract

A series of gas sensing layers based on indium oxide doped with gold were prepared by using the aerosol technology for deposition as the active contact layer in a metal oxide semiconductor capacitive device. The interaction between the measured species and the insulator surface was quantified as the voltage changes at a constant capacitance of the device. The sensor properties were investigated in the presence of H 2 , CO, NH 3 , NO, NO 2 and C 3 H 6 at temperatures between 100-400°C. Significant differences in the morphology of the layer and its sensitivity were noted for different preparation methods and different gas environments.

Nanoparticle catalysts

“…Nano-sized oxides are a convenient class of materials for gas sensors, due to the diversity of their chemical composition, the crystalline or amorphous character, the porosity, size and shape of the particles. The use of nanoparticles assures a high accessible surface for the gas molecules, allowing the use of very small amounts of substance in the sensitive layer and thus the miniaturizing of the devices [361].…”

Molecular based, chimie douce approach to 0D and 1D indium oxide nanostructures. Evaluation of their sensing properties towards CO and H2

“…On the one hand, mesoporous materials 13,14,17 were used to ensure a high surface to volume ratio. 18 For example, ordered mesoporous In 2 O 3 materials were synthesized by structure replication from hexagonal mesoporous SBA-15 silica, cubic KIT-6 silica 13,14 and solvothermal self-assembly reactions using surfactants such as sodium dodecyl sulfate or lysine. 17 On the other hand quasi one dimensional (1D) structures like nanorods, nanowires and especially nanotubes are of growing interest, since they provide larger accessible surface areas than compact 0D nanoparticles.…”

Synthesis and characterization of catalytic metal semiconductor-doped siliceous materials with ordered structure for chemical sensoring

“…The 16-pin holder was inserted in a sealed aluminum cell connected to gas inlet and outlet purge. Details about the experimental setup can be found in our previous papers [32,33].…”