1. In line with the intensive research on GQDs and N-GQDs, we report here a facile one step synthesis of GQDs and N-GQDs from the hydrothermal carbonization of citric acid (CA) in the presence of ammonia.
2. Without the use of a strong acid, oxidant and other chemical reagent, the GQDs and N-GQDs were synthesized in an aqueous solution, implying the process proposed here is relatively simple and environmentally friendly.
3. The N-GQDssynthesized here have a uniform size distribution of 3–4 nm with a thickness of a few graphene layers, and the nitrogen atoms were successfully
doped into the graphene lattice.
4. Furthermore, the prepared GQDs and N-GQDs show different fluorescence of green and blue colors, respectively, due to the electronic structure change by the successful
introduction of nitrogen atoms.
5. With these feature of the prepared GQDs, we have also demonstrated a novel fluorescent sensing application of N-GQDs for detection of Fe3+ ions.
1. In line with the intensive research on GQDs and N-GQDs, we report here a facile one step synthesis of GQDs and N-GQDs from the hydrothermal carbonization of citric acid (CA) in the presence of ammonia.
2. Without the use of a strong acid, oxidant and other chemical reagent, the GQDs and N-GQDs were synthesized in an aqueous solution, implying the process proposed here is relatively simple and environmentally friendly.
3. The N-GQDssynthesized here have a uniform size distribution of 3–4 nm with a thickness of a few graphene layers, and the nitrogen atoms were successfully
doped into the graphene lattice.
4. Furthermore, the prepared GQDs and N-GQDs show different fluorescence of green and blue colors, respectively, due to the electronic structure change by the successful
introduction of nitrogen atoms.
5. With these feature of the prepared GQDs, we have also demonstrated a novel fluorescent sensing application of N-GQDs for detection of Fe3 ions.
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