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Gas sensing effect

A systematic study of a large number of oxides showed that sensitivity of conductivity to the presence of traces of reactive gases is a phenomenon common to oxides. If the conductivity is high, then the gas sensing effect is not expected. Similarly, if the conductivity is very low as an insulator, then the effect will be difficult to measure as evidenced from the previous studies. However, if an oxide sample has a resistivity between 10" and 10 Q cm at 300°C-400°C and moderate conductivity, then it will function as a gas sensor. Mgln204 is one such material having... [Pg.256]

The explanations of observed gas-sensing effects in CNT-based devices are usually based on the analysis of adsorption/desorption phenomena taking place on the surface of CNTs (Peng and Cho 2000 Zhao et al. 2001, 2002 Bauschlicher and Ricca 2004). According to this approach, the resistance of CNT-based gas sensors is conditioned by the change of the CNT resistance caused by interaction with analyte. In particular, in many papers the interaction of NO with the nanotube was interpreted as strictly connected to a bulk doping effect. Actually, NO can be bound to a semiconducting nanotube... [Pg.18]

Fig. 3.11 Diagrams illustrating difference in gas-sensing effects in (a) polycrystaUme material and (b) individual nanowires. One can see that any intergrain necks or boundaries are absent in ID-based gas sensors. Moreover, and fields are always orthogonal and independent (Reprinted with permission from Hemandez-Ramirez et al. (2009), Copyright 2009 Royal Society of Chemistry)... Fig. 3.11 Diagrams illustrating difference in gas-sensing effects in (a) polycrystaUme material and (b) individual nanowires. One can see that any intergrain necks or boundaries are absent in ID-based gas sensors. Moreover, and fields are always orthogonal and independent (Reprinted with permission from Hemandez-Ramirez et al. (2009), Copyright 2009 Royal Society of Chemistry)...
Fig. 15.4 Principle of the optical gas-sensing effect, (a) Schematic iiiustration of goid nanoparticles embedded in the volume and on the surface of a semiconducting metal oxide layer with refractive index n. (b) Shift of the absorption peak of a single gold nanocluster (75 nm in diameter) by a variation of the refractive index of the surrounding medium at exposure to a reducing or oxidizing gas (Reprinted with permission from Schleunitz et ai. 2007, Copyright 2007... Fig. 15.4 Principle of the optical gas-sensing effect, (a) Schematic iiiustration of goid nanoparticles embedded in the volume and on the surface of a semiconducting metal oxide layer with refractive index n. (b) Shift of the absorption peak of a single gold nanocluster (75 nm in diameter) by a variation of the refractive index of the surrounding medium at exposure to a reducing or oxidizing gas (Reprinted with permission from Schleunitz et ai. 2007, Copyright 2007...
Role of Polymer Functionalization in the Gas-Sensing Effect References... [Pg.1]

Structural parameters of metal oxides controlling gas sensing effects... [Pg.72]

See other pages where Gas sensing effect is mentioned: [Pg.104]    [Pg.221]    [Pg.41]    [Pg.48]    [Pg.58]    [Pg.59]    [Pg.197]    [Pg.218]    [Pg.245]    [Pg.261]    [Pg.268]    [Pg.324]    [Pg.351]    [Pg.416]    [Pg.430]    [Pg.439]    [Pg.41]    [Pg.71]    [Pg.109]    [Pg.175]    [Pg.273]    [Pg.378]    [Pg.420]    [Pg.685]   
See also in sourсe #XX -- [ Pg.15 , Pg.39 , Pg.47 , Pg.57 , Pg.58 , Pg.59 , Pg.197 , Pg.218 , Pg.219 , Pg.245 , Pg.261 , Pg.268 , Pg.324 , Pg.351 , Pg.352 , Pg.353 , Pg.416 , Pg.439 ]

See also in sourсe #XX -- [ Pg.39 , Pg.71 , Pg.175 , Pg.245 , Pg.347 , Pg.420 ]



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Gas-sensing

Role of Polymer Functionalization in the Gas-Sensing Effect

Sensing effect

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