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

Sensors, Journal Year: 2025, Volume and Issue: 25(2), P. 382 - 382

Published: Jan. 10, 2025

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

Language: Английский

Selective Light-Activation of Sensing Regions in Hybrid Au-Graphene-Tio2 Chemoresistive Gas Sensor

Published: Jan. 1, 2025

Language: Английский

Recent advances in semiconductor gas sensors for thermal runaway early-warning monitoring of lithium-ion batteries

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 535, P. 216624 - 216624

Published: March 20, 2025

Language: Английский