A high performance methanol gas sensor based on palladium-platinum-In2O3 composited nanocrystalline SnO2

Study on room temperature gas-sensing performance of CuO film-decorated ordered porous ZnO composite by In 2 O 3 sensitization

“…These reactions lead to the resistance variation of the gas sensor. Generally, the n-type oxide semiconductor materials (such as ZnO) response mechanism involves the interaction between the detected gases and chemisorbed oxygen ions on the surface of the materials, leading to the resistance change of the sensor [ 44 , 45 ]. In air, the oxygen molecules adsorb on the surface of the materials, which can capture free electrons from the materials to form negative oxygen ions (O 2− , O − and O 2 − ) at grain boundaries, and a thick space charge layer will be formed.…”

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

“…To date, both organic and inorganic materials have been used in the fabrication of sensors. The category of inorganic materials includes semiconductor metal oxides, metals, oxide compounds, and composites [ 70 , 71 , 72 ]. In the other category, polymers are the most used organic materials in the field of sensors [ 73 ].…”

Porous Ceramic Sensors: Hydrocarbon Gas Leaks Detection

“…when a gaseous hydrocarbon leaks takes place and it migrates to the environment; this would require an immediate detection procedure of hydrocarbon vapors in order to take the respectively actions to control any catastrophic accident. This section extensively reviews the recent development of porous ceramic gas sensor materials for hydrocarbon gas leaks including LPG [64,65], CH 4 [66][67][68], H 2 [69][70][71], ethanol [29,[84][85][86][87][88], methanol [89][90][91][92], and associated gases such as NO 2 [41,[73][74][75][76][77], H 2 S [78][79][80][81][82][83], and CO [72]. Basically, the discussion will be focused on the specific overlapped section between three interesting areas such as (1) porous ceramic materials, (2) hydrocarbon gas leaks detection, and (3) sensor materials giving the opportunity to explore the interesting niche area for sensing hydrocarbons and their associated gases leaks by porous ceramic materials.…”

“…; and (3) the porous zinc oxide (ZnO) that has been used to sensing ethanol, acetone, NO 2 , H 2 S, etc. On the other hand, the catalyst elements mostly used as doping materials in order to improve the sensing properties of the porous ceramics are palladium (Pd) [65,66,85], gold (Au) [77], tungsten (W) [76,95], vanadium (V) [71], cerium (Ce) [90], platinum (Pt) [69], and/or combinations thereof [70,76,91]. The Pd could be used to explain the principle of operation of these doping elements which is based on the fact that Pd is a catalytic metal that dissociates the ambient gas to ions.…”