Functionalisation of Multi-Layer Graphene-Based Gas Sensor by Au Nanoparticles
L. Morelli (TU Delft - Electrical Engineering, Mathematics and Computer Science)
F. Ricciardella (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Max Koole (VSParticle)
Stefan Persijn (VSL Dutch Metrology Institute)
S. Vollebregt (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
A novel gas sensor based on multi-layered graphene (MLG) functionalised with gold nanoparticles (Au-NPs) is presented. We demonstrate for the first time that: (1) the signal saturates during the analyte exposure, something which does not occur in the pristine material and in graphene-based gas sensors in general; (2) the sign of the device current response is inverted. MLG is grown by chemical vapour deposition on pre-patterned CMOS-compatible Mo catalyst. The sensor is fabricated directly on the growth substrate, without any transfer of MLG. The Au-NPs are later deposited from an aerosol on the sensor at a specific controlled location, mitigating any additional patterning steps. The functionalised sensor is tested with 1 ppm (part-per-million) of NO2 at room temperature.
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