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. 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. 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. 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. With these feature of the
prepared GQDs, we have also demonstrated a novel fluorescent
sensing application of N-GQDs for detection of Fe3+ ions.
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. 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. 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. 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. 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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