Carbon-dots conductometric sensor for high performance gas sensing

In this paper the first example of using C-dots (CDs) as sensing nanomaterial for monitoring low concentrations NO2 in ambient air is reported. logic to support a green circular economy, CDs were prepared from natural cost precursor consisting olive solid waste (OSW) by simple pyrolysis process combined with chemical oxidation. Characterization data showed formation spherical dimensions narrow size range 0.5 5 nm and charged functional groups (COO- (carboxylate), C-O-C (epoxide) C-OH (hydroxyl) imprinting excellent water colloidal dispersion. The was used fabricate test conductometric gas sensor (CDs-sensor) that found exhibit performances terms high selective response sub-ppm concentration at temperature (150 °C), limit detection (LOD) 50 ppb, good reproducibility stability over use aging. To best our knowledge, reported literature material. Results here presented pave way new class carbon be applied field environmental monitoring.