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In view of this, a novel \u2018on\u2013off\u2013on\u2019 fluorescent probe based on nitrogen\u2010rich silicon quantum dots (NR\u2010SiQDs) has been designed for sensitive detection of Hg<jats:sup>2+<\/jats:sup> and CN<jats:sup>\u2212<\/jats:sup> ions in aqueous medium. NR\u2010SiQDs were synthesized using a facile, one\u2010step, and environment friendly procedure in the presence of 3\u2010aminopropyl trimethoxysilane (APTMS) and ascorbic acid (AA) as precursors, with <jats:sc>l<\/jats:sc>\u2010asparagine as a nitrogen source for surface modification. The NR\u2010SiQDs exhibited strong fluorescence emission at 450\u2009nm with 42.34% quantum yield, satisfactory salt tolerance, and superior photostability and pH stability. The fluorescence emission was effectively quenched using Hg<jats:sup>2+<\/jats:sup> (turn\u2010off) due to the formation of a nonfluorescent stable NR\u2010SiQDs\/Hg<jats:sup>2+<\/jats:sup> complex, whereas after the addition of cyanide ions (CN<jats:sup>\u2212<\/jats:sup>), Hg<jats:sup>2+<\/jats:sup> ions could be leached from the surface of the NR\u2010SiQDs and the fluorescence emission intensity of the quenched NR\u2010SiQDs fully recovered (turn\u2010on) due to the formation of highly stable [Hg(CN)<jats:sub>4<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup> species. After optimizing the response conditions, the obtained limits of detection were found to be 53\u2009nM and 0.46\u2009\u03bcM for Hg<jats:sup>2+<\/jats:sup> and CN<jats:sup>\u2212<\/jats:sup>, respectively. Finally, the NR\u2010SiQD\u2010based fluorescence probe was utilized to detect Hg<jats:sup>2+<\/jats:sup> and CN<jats:sup>\u2212<\/jats:sup> ions in water samples and satisfactory results were obtained, suggesting its potential application for environmental monitoring.<\/jats:p>","DOI":"10.1002\/bio.4195","type":"journal-article","created":{"date-parts":[[2022,1,17]],"date-time":"2022-01-17T03:57:00Z","timestamp":1642391820000},"page":"598-609","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Nitrogen\u2010rich silicon quantum dots: facile synthesis and application as a fluorescent \u2018on\u2013off\u2013on\u2019 probe for sensitive detection of Hg<sup>2+<\/sup> and cyanide ions"],"prefix":"10.1002","volume":"37","author":[{"given":"Fatemeh","family":"Rahimi","sequence":"first","affiliation":[{"name":"Research Laboratory of Nanoporous Materials, Faculty of Chemistry Iran University of Science and Technology  Narmak, Tehran Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2142-3219","authenticated-orcid":false,"given":"Mansoor","family":"Anbia","sequence":"additional","affiliation":[{"name":"Research Laboratory of Nanoporous Materials, Faculty of Chemistry Iran University of Science and Technology  Narmak, Tehran Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,2,27]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.envres.2016.06.042"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1186\/s11671-017-2411-3"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7NJ04699E"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.molliq.2019.111197"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2018.10.408"},{"key":"e_1_2_7_7_1","volume-title":"European Molecular Biology, Cyanide in biology","author":"Vennesland B. 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