We report on nitrogen dioxide (NO(2)) sensing measurements by means of zinc oxide films presenting different morphologies. The variation in the photoluminescence emission of the films is employed as transduction mechanism to detect the presence of NO(2) gas molecules at room temperature. The significant role of film morphology on the sensing properties is presented and possible limits in the use of ZnO nanostructures for NO(2) detection at high gas concentration (>20 ppm) and low gas flow (50 ml/min), where a worsening of the sensor response is observed, are discussed. These features are ascribed to a likely incomplete reversibility of the NO(2) adsorption process and examined in connection with the mechanisms of interaction between NO(2) molecules and ZnO.
Optical gas sensing through nanostructured ZnO films with different morphologies
CARICATO, Anna Paola;MARTINO, Maurizio
2010-01-01
Abstract
We report on nitrogen dioxide (NO(2)) sensing measurements by means of zinc oxide films presenting different morphologies. The variation in the photoluminescence emission of the films is employed as transduction mechanism to detect the presence of NO(2) gas molecules at room temperature. The significant role of film morphology on the sensing properties is presented and possible limits in the use of ZnO nanostructures for NO(2) detection at high gas concentration (>20 ppm) and low gas flow (50 ml/min), where a worsening of the sensor response is observed, are discussed. These features are ascribed to a likely incomplete reversibility of the NO(2) adsorption process and examined in connection with the mechanisms of interaction between NO(2) molecules and ZnO.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
