Figure 2 | Scientific Reports

Figure 2

From: Engineering surface states of carbon dots to achieve controllable luminescence for solid-luminescent composites and sensitive Be2+ detection

Figure 2

(a) Schematic approach used to prepare carbon dots. The process includes precursor polymerization and subsequent carbonization. The image in the top right-hand side corner presents a schematic structure of the prepared dots, containing both polymer-like components (black stripes) and crystalline graphite segments (honeycomb clusters); a photograph of the product is also presented; (b) TEM image of L-CDs prepared at 160°C, where the inset is an HRTEM image showing the existence of both amorphous and crystalline parts (scale bar indicates 10 nm); (c) FTIR spectra of L-CDs fabricated at 160 and 240°C; (d) C 1s and (e) N 1s XPS spectra of a sample prepared at 160°C.

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