Neutral amines-templated mesoporous silica systems impregnated with Reichardt's dye are pink in color if previously dehydrated and white if still covered with hydroxyls: the pink coloration is, however, reversibly restored by exposing the latter sample only to NH3 and amines. The mechanism of color change is discussed, and such systems are proposed as possible ammonia gas sensors.
Mechanism of the optical response of mesoporous silica impregnated with Reichardt’s dye to NH3 and other gases
VISCARDI, Guido;
2004-01-01
Abstract
Neutral amines-templated mesoporous silica systems impregnated with Reichardt's dye are pink in color if previously dehydrated and white if still covered with hydroxyls: the pink coloration is, however, reversibly restored by exposing the latter sample only to NH3 and amines. The mechanism of color change is discussed, and such systems are proposed as possible ammonia gas sensors.
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J.Phys.Chem.B 108 16617-16620 2004.pdf
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