1995
DOI: 10.1016/0925-4005(94)01548-v
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The effect of additives in tin oxide on the sensitivity and selectivity to NOx and CO

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Cited by 68 publications
(33 citation statements)
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“…In fact, the substitution of Al adds more acceptor levels resulting in lowering the Fermi level down towards center of band gap. The reaction between NO 2 and SnO 2 : Al surface reduces the surface electron concentration by trapping more electrons from the surface and hence an increase of resistance is noted (Sayago et al, 1995). Our results exhibit a resistance value of SnO 2 : Al, which is about 5 orders of magnitude higher than that of pure SnO 2 , i.e., R SnO 2 = 2.5×10 4 R SnO 2 : Al = 1.2×10 9 at 400 • C in pure argon (see Fig.…”
Section: Effect Of Al Doping In the No 2 Sensing Mechanismmentioning
confidence: 99%
“…In fact, the substitution of Al adds more acceptor levels resulting in lowering the Fermi level down towards center of band gap. The reaction between NO 2 and SnO 2 : Al surface reduces the surface electron concentration by trapping more electrons from the surface and hence an increase of resistance is noted (Sayago et al, 1995). Our results exhibit a resistance value of SnO 2 : Al, which is about 5 orders of magnitude higher than that of pure SnO 2 , i.e., R SnO 2 = 2.5×10 4 R SnO 2 : Al = 1.2×10 9 at 400 • C in pure argon (see Fig.…”
Section: Effect Of Al Doping In the No 2 Sensing Mechanismmentioning
confidence: 99%
“…After the In 2 O 3 -ZnO film was exposed to NO x gas, NO x would react with O 2ads − , via Eqs. (4) and (5), and cause the reduction in the electron concentration, resulting in the increase in the sensor resistance [21].…”
Section: Possible Sensing Mechanismsmentioning
confidence: 99%
“…has been improved considerably by reducing the size of the SnO 2 particles used in the sensors 6,14 -16 and/or by adding dopants (typically noble metals or other metal oxides) to the tin dioxide. 3,5,6,14,[17][18][19] Specifically, several researchers have shown that pure SnO 2 gas-sensor performance is enhanced by using nanosized particles where the particle size is less than 10 nm.…”
Section: T In Dioxide (Snomentioning
confidence: 99%