Figure 1
From: Paper strip-embedded graphene quantum dots: a screening device with a smartphone readout
Schematic representation of the fluorescence quenching of Quantum Dots in the presence of an analyte by the FRET phenomenon. (A) Examples of phenolic compounds susceptible of producing GQDs quenching and those unable to produce it are denoted with a yellow and red circle, respectively. (B) Schematic representation of a 3D-printed device with its different parts. (C) The electric circuit of the 365 nm UV LED connected to the male USB port. (D) Scheme of a nitrocellulose paper strip with wax-printed circular areas. (E) Image of the sensing platform where the fluorescent spot is observed in the middle of a mobile phone screen. (F) Picture of the sensing area of a yes/no (ON/OFF) typical result.
