Quartz-crystal microbalance (QCM) sensors obtained by a facile deposition of TiO₂ nanoparticles have been manufactured and tested. Their gas sensing performance is discussed from a theoretical point of view and then verified by means of ``ad hoc'' measurement systems, through experiments with two toxic gases, CO and NO₂, and water vapor. The influence of UV irradiation on the sensor response has also been studied. Results show stable and repeatable responses, characterized by a very high sensitivity to water vapor, a good sensitivity to NO₂, and only a fairly low response to CO. Both CO and NO₂ responses depend strongly on the relative humidity (RH). So, NO₂ sensing should be performed in a controlled humidity environment. Devices proved to be reliable detectors of low RH values. Advantages as low cost, facile preparation, RT operation, good stability, and high/moderate sensitivity, make these devices attractive as an alternative to mostly used gas sensors.
Quartz-Crystal Microbalance Gas Sensors Based on TiO₂ Nanoparticles / Addabbo, Tommaso; Fort, Ada; Mugnaini, Marco; Vignoli, Valerio; Baldi, Andrea; Bruzzi, Mara. - In: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. - ISSN 0018-9456. - STAMPA. - PP issue 99:(2018), pp. 1-9. [10.1109/TIM.2017.2785118]
Quartz-Crystal Microbalance Gas Sensors Based on TiO₂ Nanoparticles
Mugnaini, Marco;Baldi, Andrea;Bruzzi, Mara
2018
Abstract
Quartz-crystal microbalance (QCM) sensors obtained by a facile deposition of TiO₂ nanoparticles have been manufactured and tested. Their gas sensing performance is discussed from a theoretical point of view and then verified by means of ``ad hoc'' measurement systems, through experiments with two toxic gases, CO and NO₂, and water vapor. The influence of UV irradiation on the sensor response has also been studied. Results show stable and repeatable responses, characterized by a very high sensitivity to water vapor, a good sensitivity to NO₂, and only a fairly low response to CO. Both CO and NO₂ responses depend strongly on the relative humidity (RH). So, NO₂ sensing should be performed in a controlled humidity environment. Devices proved to be reliable detectors of low RH values. Advantages as low cost, facile preparation, RT operation, good stability, and high/moderate sensitivity, make these devices attractive as an alternative to mostly used gas sensors.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.