Journal of Nanotechnology / 2019 / Article / Fig 2

Research Article

Green Synthesis of Highly Luminescent Carbon Quantum Dots from Lemon Juice

Figure 2

Characterizations of C-dots. (a, b) HRTEM image (the scale bar: 20 nm), (c) XPS spectrum, and (d) high-resolution XPS spectra of C1s of C-dots.