“Turn-Off” Fluorescent Sensor for Pamidronate Disodium and Zoledronic Acid Based on Newly Synthesized Carbon Dots from Black Tea

Figure 2

(a) XPS survey spectrum of CDs. (b) C1s, (c) O1s, and (d) N1s high-resolution XPS spectra of the CQDs.

(a)

(b)

(c)

(d)