Flexible all-biomass gas sensor based on doped carbon quantum dots/nonwoven cotton with discriminative function

Carbon quantum dots (CQDs) co-doped with N, P and S derived from expired milk was prepared by a simple hydrothermal method. By dipping pure cotton face towel (PCFT) into CQDs ink, flexible all-biomass CQDs/PCFT sensor for the first time. Due to heteroatom doping, extremely small particle size of excellent permeability film, showed high sensitivity bending stability. In range 0–60° states, responses four target analytes changed less 5.0%. After 3000 60°, maximum change response only 6.4%. Interestingly, due abundant functional groups defects CQDs, displayed sensing curves different shapes analytes. this way, establishing database analytes, multiple can be detected discriminatively relying on single help image recognition. This work provided reference development fiber based all biomass gas sensor.