NO2 is an important environmental pollutant and is harmful to human health even at very low concentrations. In this paper, we propose a novel chipless RFID sensor able to work at room temperature and to detect sub-ppm concentration of NO2 in the environment. The sensor is made of a metallic resonator covered with NO2-sensitive tin oxide and works by monitoring both the frequency and the intensity of the output signal. The experimental measurements show a fast response (a few minutes) but a very slow recovery. The sensor could therefore be used for non-continuous threshold monitoring. However, we also demonstrated that the recovery can be strongly accelerated upon exposure to a UV source. This opens the way to the reuse of the sensor, which can be easily regenerated after prolonged exposure and recycled several times.
Sub-ppm NO2 Detection through Chipless RFID Sensor Functionalized with Reduced SnO2 / Mulloni, Viviana; Gaiardo, Andrea; Marchi, Giada; Valt, Matteo; Vanzetti, Lia; Donelli, Massimo; Lorenzelli, Leandro. - In: CHEMOSENSORS. - ISSN 2227-9040. - 2023, 11:7(2023), pp. 1-15. [10.3390/chemosensors11070408]
Sub-ppm NO2 Detection through Chipless RFID Sensor Functionalized with Reduced SnO2
Mulloni, Viviana;Marchi, Giada;Donelli, Massimo;Lorenzelli, Leandro
2023-01-01
Abstract
NO2 is an important environmental pollutant and is harmful to human health even at very low concentrations. In this paper, we propose a novel chipless RFID sensor able to work at room temperature and to detect sub-ppm concentration of NO2 in the environment. The sensor is made of a metallic resonator covered with NO2-sensitive tin oxide and works by monitoring both the frequency and the intensity of the output signal. The experimental measurements show a fast response (a few minutes) but a very slow recovery. The sensor could therefore be used for non-continuous threshold monitoring. However, we also demonstrated that the recovery can be strongly accelerated upon exposure to a UV source. This opens the way to the reuse of the sensor, which can be easily regenerated after prolonged exposure and recycled several times.File | Dimensione | Formato | |
---|---|---|---|
chemosensors-11-00408.pdf
accesso aperto
Tipologia:
Versione editoriale (Publisher’s layout)
Licenza:
Creative commons
Dimensione
5.01 MB
Formato
Adobe PDF
|
5.01 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione