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2025-01-01

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cc-by (c) Vafaei, P. et al., 2025
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/220745

Graphene/TiO2 Heterostructure Integrated with a Micro-Lightplate for Low-Power NO2 Gas Detection

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https://doi.org/10.3390/s25020382

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Low-power gas sensors that can be used in IoT (Internet of Things) systems, consumer devices, and point-of-care devices will enable new applications in environmental monitoring and health protection. We fabricated a monolithic chemiresistive gas sensor by integrating a micro-lightplate with a 2D sensing material composed of single-layer graphene and monolayer-thick TiO2. Applying ultraviolet (380 nm) light with quantum energy above the TiO2 bandgap effectively enhanced the sensor responses. Low (<1 μW optical) power operation of the device was demonstrated by measuring NO2 gas at low concentrations, which is typical in air quality monitoring, with an estimated limit of detection < 0.1 ppb. The gas response amplitudes remained nearly constant over the studied light intensity range (1–150 mW/cm2) owing to the balance between the photoinduced adsorption and desorption processes of the gas molecules. The rates of both processes followed an approximately square-root dependence on light intensity, plausibly because the electron–hole recombination of photoinduced charge carriers is the primary rate-limiting factor. These results pave the way for integrating 2D materials with micro-LED arrays as a feasible path to advanced electronic noses.

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Grafè, Detectors de gasos, Diòxid de titani

Matèries (anglès)

Graphene, Gas detectors, Titanium dioxide

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Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

Citació

VAFAEI, Paniz, KODU, Margus, ALLES, Harry, KIISK, Valter, CASALS GUILLÉN, Olga, PRADES GARCÍA, Juan daniel, JAANISO, Raivo. Graphene/TiO2 Heterostructure Integrated with a Micro-Lightplate for Low-Power NO2 Gas Detection. _Sensors_. 2025. Vol. 25, núm. 2. [consulta: 25 de febrer de 2026]. ISSN: 1424-8220. [Disponible a: https://hdl.handle.net/2445/220745]

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