Boron-Doped Graphene Quantum Dots (BGQDs) from Spent Coffee Ground for Glucose Sensor

Figure 4

The fluorescence quenching spectra of (a) GQDs and (b) BGQDs in the detection 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 mM concentrations of glucose. (c, d) The respective plot of the fluorescence quenching for GQDs at λ = 439 and BGQDs at 417 nm vs. the concentration of glucose.

(a)

(b)

(c)

(d)