Nitrogen-doped carbon dots with bright fluorescence for highly sensitive detection of Fe3+ in environmental waters

Oxytetracycline-derived carbon dots as a fluorescent switch in trace ferric ion sensing

“…In general, interactions between the surface groups of OCDs and Fe(III) facilitate energy transfer, leading to fluorescence quenching. 48,49 More details are presented in Fig. S13 (ESI †).…”

Semiquantitative and visual detection of ferric ions in real samples using a fluorescent paper-based analytical device constructed with green emitting carbon dots

“…The absorbance of the CDs-Fe 3+ was not a summation of CDs and Fe 3+ absorbance values, and the absorbance within 250-400 nm was signicantly higher than the sum result, indicating that CDs and Fe 3+ formed new non-uorescent ground state complexes. 4,16,17 To further ascertain this speculation, zeta potential and FT-IR spectra of CDs before and aer the introduction of Fe 3+ were measured. As shown in Fig.…”

“…3 Besides that, Fe 3+ widely exists in various natural environments such as animals and plants, soil, and river basin water, and in case of high content, it will be enriched in soil and water, which will affect the growth of animals and plants, and may also enter the body through the food chain to endanger human health. [4][5][6] Therefore, the rapid, accurate, and sensitive detection of Fe 3+ is still necessary for environmental monitoring and human health protection.…”

Fluorescent Nitrogen‐Doped Carbon Dots as Nanosensors for the Detection of Fe3+ Ions

“…These advantages make CDs promising platforms for application in various research fields, including bioimaging, clinical diagnosis, sensing, catalysis, and information encryption. [24,[25][26][27][28][29][30][31][32][33][34] For example, Liu et al synthesized CDs from rose-heart radish with a fluorescent quantum yield (QY) of 13.6%. The Fe 3þ ion can quench its FL emission and the LOD was 0.13 μM.…”

“…[ 31 ] Zhou et al designed nitrogen‐doped CDs (N‐CDs) by using cysteine and ethylenediamine as precursors, and the as‐designed fluorescent sensor can be used for the detection of Fe 3+ with FL quenched via the internal filtration effect. [ 32 ] Li et al synthesized N‐ and S ‐ co‐doped CDs through one‐pot hydrothermal process, and the aforementioned N/S‐CDs showed a high QY of 26%. FL quenching can be realized with the addition of Fe 3+ ions with a good linearity within 0.3–70 μ m , and the LOD of Fe 3+ ions can reach 0.19 μ m .…”