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Therefore, it is crucial to monitor their concentration in water. This study has identified sulfur and nitrogen codoped carbon dots (S,N\u2010CDs), which achieved optimal fluorescent performance with a fluorescence quantum yield as high as 37.9%. The amino (\u2010NH\u2082) and mercapto (\u2010SH) groups on the surface of S,N\u2010CDs, which contain lone pair electrons, readily coordinate with silver ions to form complexes. Furthermore, a strong linear relationship is observed within the concentration range of 0.001\u2013450\u2009\u03bcM, making this method suitable for detecting silver ion concentrations. This study presents a cost\u2010effective, easy\u2010to\u2010prepare, efficient, and selective fluorescent sensor for detecting silver ion concentrations, with potential applications in monitoring silver ions in water.<\/jats:p>","DOI":"10.1002\/bio.70401","type":"journal-article","created":{"date-parts":[[2026,1,2]],"date-time":"2026-01-02T11:12:23Z","timestamp":1767352343000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["S,N\u2010Codoped Carbon Dots Derived From Acetone and Thiourea via Solvothermal Method: A Fluorescent Probe for Ag\n                    <sup>+<\/sup>\n                    Ion Detection"],"prefix":"10.1002","volume":"41","author":[{"given":"Yunping","family":"Lai","sequence":"first","affiliation":[{"name":"College of Chemistry, Chemical Engineering and Materials, Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, Hebei Key Laboratory of Heterocyclic Compounds, Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province Handan University  Handan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8563-5434","authenticated-orcid":false,"given":"Shanshan","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Chemistry, Chemical Engineering and Materials, Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, Hebei Key Laboratory of Heterocyclic Compounds, Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province Handan University  Handan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Chemistry, Chemical Engineering and Materials, Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, Hebei Key Laboratory of Heterocyclic Compounds, Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province Handan University  Handan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianyao","family":"Song","sequence":"additional","affiliation":[{"name":"College of Chemistry, Chemical Engineering and Materials, Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, Hebei Key Laboratory of Heterocyclic Compounds, Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province Handan University  Handan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia","family":"Guo","sequence":"additional","affiliation":[{"name":"College of Chemistry, Chemical Engineering and Materials, Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, Hebei Key Laboratory of Heterocyclic Compounds, Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province Handan University  Handan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yisen","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Chemistry, Chemical Engineering and Materials, Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, Hebei Key Laboratory of Heterocyclic Compounds, Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province Handan University  Handan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Beihang University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,1,2]]},"reference":[{"issue":"1","key":"e_1_2_11_2_1","first-page":"80","article-title":"Recent Developments in Heavy Metals Detection: Modified Electrodes, Pretreatment Methods, Prediction Models and Algorithms","volume":"15","author":"Shi Y.","year":"2025","journal-title":"Meta"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2016.04.021"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2016.01.055"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphotochem.2025.116841"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.microc.2025.115024"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10895-025-04230-0"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/bio.70092"},{"key":"e_1_2_11_9_1","first-page":"1","article-title":"Recent Progress in Folic Acid Detection Based on Fluorescent Carbon Dots as Sensors: A Review","volume":"35","author":"Kayani K. 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