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A novel triphenylamine\u2010based Schiff base fluorescent probe (triphenylamine\u2010diaminopyridine, TPA\u2010DAP) was synthesized with diaminopyridine as the recognition unit. It exhibits high selectivity, rapid response, large stokes shift, low detection limit of 1.04\u2009\u03bcM, obvious fluorescence quenching, and visible color changes toward Cu\n                    <jats:sup>2+<\/jats:sup>\n                    . Cu\n                    <jats:sup>2+<\/jats:sup>\n                    binds with TPA\u2010DAP to form a stable\u00a02:1 complex and quenches fluorescence through electronic and paramagnetic effects, which can be reversed by vitamin C. The sensing mechanism was verified by HRMS, NMR, and DFT calculations. TPA\u2010DAP achieves effective Cu\n                    <jats:sup>2+<\/jats:sup>\n                    detection in actual water samples. The prepared TPA\u2010DAP@PVA\/SA composite membrane establishes a fluorescence\u2010afterglow dual\u2010mode platform for portable visual on\u2010site Cu\n                    <jats:sup>2+<\/jats:sup>\n                    detection.\n                  <\/jats:p>","DOI":"10.1002\/bio.70602","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T01:12:37Z","timestamp":1785978757000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Triarylamine\u2010Based Fluorescent Probe for Cu\n                    <sup>2+<\/sup>\n                    Detection in Aqueous Solutions and Food and Construction of \u201cFluorescence\u2010Afterglow\u201d Sensor Membranes"],"prefix":"10.1002","volume":"41","author":[{"given":"Long","family":"Liu","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaoyun","family":"She","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qihuan","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yichen","family":"Li","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9005-3839","authenticated-orcid":false,"given":"Xiaotong","family":"Deng","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meijun","family":"Ye","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiamin","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanqing","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5720-7083","authenticated-orcid":false,"given":"Jingshui","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Guangdong University of Petrochemical Technology  Maoming Guangdong China"},{"name":"Guangdong Provincial Key Laboratory of Petrochemical Equipment Fault Diagnosis  Maoming Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,5]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2023.144951"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/jcmm.70611"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.1093\/nar\/gkae1309"},{"key":"e_1_2_12_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201814069"},{"key":"e_1_2_12_6_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmolb.2022.1065265"},{"key":"e_1_2_12_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaut.2025.103484"},{"key":"e_1_2_12_8_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12964\u2010025\u201002558\u20105"},{"key":"e_1_2_12_9_1","doi-asserted-by":"publisher","DOI":"10.3390\/metabo14010038"},{"key":"e_1_2_12_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2023.166285"},{"key":"e_1_2_12_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/bio.4857"},{"key":"e_1_2_12_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aquatox.2023.106452"},{"key":"e_1_2_12_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ecoenv.2025.117775"},{"key":"e_1_2_12_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.intimp.2024.113698"},{"key":"e_1_2_12_15_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmed.2026.1758345"},{"key":"e_1_2_12_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12011\u2010024\u201004345\u20108"},{"issue":"3","key":"e_1_2_12_17_1","article-title":"Copper Toxicity Is Not Just Oxidative Damage: Zinc Systems and Insight From Wilson Disease","volume":"9","author":"Barber R. 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