The aim of this work was to investigate the difference between thin-film sensors based on pure ZnO nanoparticles and on gold cluster decorated ZnO in photo-activation mode. Many scientific articles deal with the properties of chemoresistive semiconductor under light activation, usually with radiation energy of the magnitude order of the semiconductor band gap. For this reason, we have tested the two types of ZnO thin films to several gases, at room temperature and under different wavelengths of illumination. The obtained results showed some interesting features of the two sensing materials, such as better chemoresistive properties of gold decorated ZnO than pure ZnO thin films, and, more importantly, a selective response of the former to NO2 under green light irradiation.
ZnO and ZnO/Au Thin Films: Chemoresistive Properties in Photo-acivation Mode for Gas Sensing Applications
Gaiardo, Andrea;Bellutti, Pierluigi;Valt, M.;Pepponi, Giancarlo;
2016-01-01
Abstract
The aim of this work was to investigate the difference between thin-film sensors based on pure ZnO nanoparticles and on gold cluster decorated ZnO in photo-activation mode. Many scientific articles deal with the properties of chemoresistive semiconductor under light activation, usually with radiation energy of the magnitude order of the semiconductor band gap. For this reason, we have tested the two types of ZnO thin films to several gases, at room temperature and under different wavelengths of illumination. The obtained results showed some interesting features of the two sensing materials, such as better chemoresistive properties of gold decorated ZnO than pure ZnO thin films, and, more importantly, a selective response of the former to NO2 under green light irradiation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
