Cannabis Sativa derived carbon dots with N-S co-doped: highly efficient nanosensors for temperature and vitamin B12
With the enhancement in biomimetic and bioinspired synthesis approach, plant-derived nanostructure provides most suitable synthesis alternative in terms of non-toxic, economical and eco-friendliness. The present work focuses on cannabis sativa derived carbon dots co-doped with nitrogen and sulphur (N-S@CsCD) as a nanosensors. The N-S@CsCD exhibits the distribution of size in the range of 4-6 nm and shows the excitation independent emission behaviour with emission wavelength around 414 nm. XPS spectra confirmed the presence of heteroatom doping by nitrogen and sulphur with concentration of 10.71 and 1.94%, respectively. N-S@CsCD shows excellent stability with pH, time and salt concentration. Interestingly, N-S@CsCD exhibits reversible temperature responsive fluorescence “turn-off” behaviour. Further, N-S@CsCD also shows selective fluorescence “turn-off” behaviour in the presence of vitamin B12 (VB12) with a limit of detection value of 7.87 µg/mL. The fluorescence life time of N-S@CsCD with and without VB12 were similar, which infers the sensing behaviour was purely static in nature. Moreover, N-S@CsCD shows biocompatible and non-toxic behaviour with very high cell viability. The fluorescent nature of N-S@CsCD was further evaluated for intracellular imaging.