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.
2023
7
Mulloni, Viviana; Gaiardo, Andrea; Marchi, Giada; Valt, Matteo; Vanzetti, Lia; Donelli, Massimo; Lorenzelli, Leandro
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]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/402196
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