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It has an amorphous\u2010nanocrystalline turbostratic carbon system consisting of N\u2010disrupt core sp\n                    <jats:sup>2<\/jats:sup>\n                    \/sp\n                    <jats:sup>3<\/jats:sup>\n                    carbon with highly integrated nitrogen, whereas in the outer sp\n                    <jats:sup>2<\/jats:sup>\n                    carbon shell with excess nitrogen creating densely and multifaceted groups (amine, amide, and pyridinic). The characteristic broad pxrd peak at 22.40\u00b0 (002) and a hump 44.70\u00b0 (100) were obtained with particle size \u22488.0\u20139.0\u2009nm in quasispherical form with distinct lattice d\u2010spacing value. The N\u2010CDs gain highly hydrophilicity and dispersibility in water. The N\u2010CDs possess excellent optical properties with long range (350\u2013600\u2009nm) blue\u2010green fluorescence caused by electron trapping in N\u2010surface states and radiative recombination (\n                    <jats:italic>\u0424<\/jats:italic>\n                    \u2009=\u200932%). This fluorescence emission is selectively quenched upon interaction with Fe\n                    <jats:sup>3+<\/jats:sup>\n                    ions in pool of various metal ions. The quenching mechanism involves the locking of electron trap N\u2010surface states caused by Hard Acid\u2014Hard Base complexation of Fe\n                    <jats:sup>3+<\/jats:sup>\n                    ions with multifunctional N and O containing groups leading to Photoinduced Electron Transfer. The linear quenching and regression coefficient reveal a highly sensitive (LOD\u2009=\u200999.4\u2009nM), strong binding and static quenching. Practical application in real water sample analysis and anticounterfeiting ink test was demonstrated.\n                  <\/jats:p>","DOI":"10.1002\/bio.70623","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T10:35:00Z","timestamp":1789554900000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Facile Synthesis of High Yield Blue\u2010Green Emissive Nitrogen\u2010Doped Carbon Dots for the Detection of Fe\n                    <sup>3+<\/sup>\n                    Ions and as a Fluorescent Ink"],"prefix":"10.1002","volume":"41","author":[{"given":"Soundaralakshmi","family":"Swamynathan","sequence":"first","affiliation":[{"name":"Department of Chemistry SSM Institute of Engineering and Technology  Dindigul Tamil Nadu India"},{"name":"Department of Science and Humanities Anna University\u2010University College of Engineering  Dindigul Tamil Nadu 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