Evaluating humidity sensing response of graphene quantum dots synthesized by hydrothermal treatment of glucose.

Graphene quantum dots (GQDs) were prepared using a single-step hydrothermal treatment of glucose (CHO) powder. X-ray diffraction patterns confirmed the random stacking or amorphous character of GQDs. Additionally, the UV-vis spectra confirmed the formation of GQDs with evident absorption peaks at 237 and 305 nm, which is attributed to-* and-* transitions correspondingly.